{"id":278008,"date":"2019-12-19T13:54:19","date_gmt":"2019-12-19T06:54:19","guid":{"rendered":"https:\/\/quipperhome.wpcomstaging.com\/?p=278008"},"modified":"2023-02-07T15:33:49","modified_gmt":"2023-02-07T08:33:49","slug":"barisan-dan-deret-matematika-kelas-11","status":"publish","type":"post","link":"https:\/\/quipperhome.wpcomstaging.com\/mapel\/matematika\/barisan-dan-deret-matematika-kelas-11\/","title":{"rendered":"Barisan dan Deret Rumus serta Contoh Soal &#8211; Matematika Kelas 11"},"content":{"rendered":"<p><img fetchpriority=\"high\" decoding=\"async\" class=\"alignnone size-full wp-image-278048\" src=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2019\/12\/Barisan-dan-Deret-Matematika-Kelas-11-e.png\" alt=\"Barisan dan Deret - Matematika Kelas 11\" width=\"800\" height=\"533\" srcset=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2019\/12\/Barisan-dan-Deret-Matematika-Kelas-11-e.png 800w, https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2019\/12\/Barisan-dan-Deret-Matematika-Kelas-11-e-768x512.png 768w, https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2019\/12\/Barisan-dan-Deret-Matematika-Kelas-11-e-585x390.png?crop=1 585w, https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2019\/12\/Barisan-dan-Deret-Matematika-Kelas-11-e-263x175.png?crop=1 263w, https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2019\/12\/Barisan-dan-Deret-Matematika-Kelas-11-e-300x200.png 300w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/p>\n<p><span style=\"font-weight: 400;\">Hai Quipperian, bagaimana kabarnya? Semoga selalu sehat dan tetap semangat, ya!<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Pada pertemuan kali ini, Quipper Blog akan membahas tentang baris dan deret. Konsep baris dan deret ini biasa kamu jumpai dalam kehidupan sehari-hari. Misalnya saat kamu berinvestasi sebesar Rp10.000.000. Pada bulan pertama kamu investasi, keuntungan yang diperoleh adalah Rp2.000. Pada bulan kedua, keuntungannya menjadi Rp4.000 dan bulan ketiga menjadi Rp8.000.&nbsp;<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Kira-kira berapa keuntungan yang kamu dapatkan setelah 10 bulan berinvestasi? Total keuntungan yang akan kamu dapatkan setelah 10 bulan berinvestasi bisa langsung kamu tentukan dengan konsep baris dan deret ini, <\/span><i><span style=\"font-weight: 400;\">lho<\/span><\/i><span style=\"font-weight: 400;\">. Ingin tahu pembahasan selanjutnya tentang baris dan deret? Simak ulasan berikut.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Secara umum, barisan dan deret dibagi menjadi dua, yaitu barisan dan deret aritmetika serta barisan dan deret geometri. Apakah perbedaan keduanya?<\/span><\/p>\n<h2><b>Barisan Aritmetika<\/b><\/h2>\n<p><img decoding=\"async\" class=\"alignnone size-full wp-image-278052\" src=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2019\/12\/Barisan-dan-Deret-Matematika-Kelas-11-a.png\" alt=\"\" width=\"800\" height=\"533\" srcset=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2019\/12\/Barisan-dan-Deret-Matematika-Kelas-11-a.png 800w, https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2019\/12\/Barisan-dan-Deret-Matematika-Kelas-11-a-300x200.png 300w, https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2019\/12\/Barisan-dan-Deret-Matematika-Kelas-11-a-768x512.png 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/p>\n<p><span style=\"font-weight: 400;\">Barisan aritmetika merupakan barisan bilangan dengan pola yang tetap berdasarkan operasi penjumlahan dan pengurangan. Selisih antara dua suku berurutan pada barisan aritmetika disebut beda yang dilambangkan dengan <\/span><b><i>b<\/i><\/b><span style=\"font-weight: 400;\">. Rumus untuk menentukan beda pada barisan aritmetika adalah sebagai berikut.&nbsp;<\/span><\/p>\n<p><a href=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2019\/12\/Capture-1.png\" data-rel=\"penci-gallery-image-content\" ><img decoding=\"async\" class=\"alignnone size-full wp-image-280111\" src=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2019\/12\/Capture-1.png\" alt=\"Rumus untuk menentukan beda pada barisan aritmetika\" width=\"108\" height=\"41\"><\/a><\/p>\n<p>Keterangan:<br \/>\n<em>b<\/em> = beda;<br \/>\n<em><span style=\"font-weight: 400;\">U<\/span><\/em><sub><em><span style=\"font-weight: 400;\">n<\/span><\/em><\/sub>= suku ke-n;<br \/>\n<em><span style=\"font-weight: 400;\">U<\/span><\/em><sub><em><span style=\"font-weight: 400;\">n+1<\/span><\/em><\/sub>= suku sebelum suku ke-n; dan<br \/>\n<em><span style=\"font-weight: 400;\">n<\/span><\/em>= banyaknya suku.<\/p>\n<h3><b>1. Bentuk barisan aritmetika<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">Adapun bentuk barisan aritmetika adalah sebagai berikut.<\/span><\/p>\n<p><span style=\"font-weight: 400;\"> <img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-278041\" src=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2019\/12\/Barisan-dan-Deret-Matematika-Kelas-11-2.png\" alt=\"\" width=\"259\" height=\"57\"><\/span><\/p>\n<p><span style=\"font-weight: 400;\">Rumus selisih atau bedanya, adalah sebagai berikut.<\/span><\/p>\n<p><span style=\"font-weight: 400;\"> <img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-278040\" src=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2019\/12\/Barisan-dan-Deret-Matematika-Kelas-11-3.png\" alt=\"\" width=\"122\" height=\"55\"><\/span><\/p>\n<p><span style=\"font-weight: 400;\">Keterangan:<\/span><\/p>\n<p><em><span style=\"font-weight: 400;\">U<\/span><\/em><sub><em><span style=\"font-weight: 400;\">n+1<\/span><\/em><\/sub> <span style=\"font-weight: 400;\">= suku ke-(<\/span><em><span style=\"font-weight: 400;\">n<\/span><\/em><span style=\"font-weight: 400;\"> +1);<\/span><\/p>\n<p><em><span style=\"font-weight: 400;\">U<\/span><\/em><sub><em><span style=\"font-weight: 400;\">n<\/span><\/em><\/sub><span style=\"font-weight: 400;\"> = suku ke-<\/span><em><span style=\"font-weight: 400;\">n<\/span><\/em><span style=\"font-weight: 400;\">; dan<\/span><\/p>\n<p><em><span style=\"font-weight: 400;\">b<\/span><\/em><span style=\"font-weight: 400;\"> = beda atau selisih.<\/span><\/p>\n<p>&nbsp;<\/p>\n<p><span style=\"font-weight: 400;\">Akibat dari rumus suku ke-<\/span><span style=\"font-weight: 400;\">n<\/span><span style=\"font-weight: 400;\"> tersebut, dapat diperoleh:<\/span><\/p>\n<p><span style=\"font-weight: 400;\"><em>U<\/em><sub><em>1<\/em><\/sub><\/span><span style=\"font-weight: 400;\">, <\/span><span style=\"font-weight: 400;\"> &nbsp;<em>U<\/em><sub><em>2<\/em><\/sub><\/span><span style=\"font-weight: 400;\">,&nbsp; <\/span><span style=\"font-weight: 400;\"><em>U<\/em><sub><em>3<\/em><\/sub><\/span><span style=\"font-weight: 400;\">,&nbsp; \u2026, <\/span><span style=\"font-weight: 400;\">&nbsp; <em>U<\/em><sub><em>n-2<\/em><\/sub><\/span><span style=\"font-weight: 400;\">,&nbsp; &nbsp;<\/span><span style=\"font-weight: 400;\"><em>U<\/em><sub><em>n-1<\/em><\/sub><\/span><span style=\"font-weight: 400;\">, <\/span><span style=\"font-weight: 400;\">&nbsp; <em>U<\/em><sub><em>n<\/em><\/sub><\/span><\/p>\n<p><span style=\"font-weight: 400;\">&nbsp;<\/span><span style=\"font-weight: 400;\">a, &nbsp; &nbsp; a+b, a+2b, &nbsp; \u2026, a+<\/span><span style=\"font-weight: 400;\">n-3<\/span><span style=\"font-weight: 400;\">b, &nbsp; a+<\/span><span style=\"font-weight: 400;\">n-2<\/span><span style=\"font-weight: 400;\">b, &nbsp; a+<\/span><span style=\"font-weight: 400;\">n-1<\/span><span style=\"font-weight: 400;\">b<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Jika banyak suku (<\/span><i><span style=\"font-weight: 400;\">n<\/span><\/i><span style=\"font-weight: 400;\">) ganjil, suku tengah (<\/span><i><span style=\"font-weight: 400;\">U<\/span><\/i><i><span style=\"font-weight: 400;\">t<\/span><\/i><span style=\"font-weight: 400;\">) barisan aritmetika dapat dirumuskan&nbsp;<\/span><\/p>\n<p><span style=\"font-weight: 400;\">sebagai berikut.<\/span><\/p>\n<p><a href=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2019\/12\/Capture-2.png\" data-rel=\"penci-gallery-image-content\" ><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-280113\" src=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2019\/12\/Capture-2.png\" alt=\"banyak suku (n) ganjil, suku tengah (Ut) barisan aritmetika\" width=\"215\" height=\"44\"><\/a><\/p>\n<p><span style=\"font-weight: 400;\">Sementara itu, jika di antara dua buah suku <\/span><span style=\"font-weight: 400;\">U<\/span><span style=\"font-weight: 400;\">1<\/span><span style=\"font-weight: 400;\">,<\/span><span style=\"font-weight: 400;\">U<\/span><span style=\"font-weight: 400;\">2<\/span><span style=\"font-weight: 400;\">,<\/span><span style=\"font-weight: 400;\">U<\/span><span style=\"font-weight: 400;\">3<\/span><span style=\"font-weight: 400;\">,\u2026,<\/span><span style=\"font-weight: 400;\">U<\/span><span style=\"font-weight: 400;\">n<\/span><span style=\"font-weight: 400;\"> disisipkan <\/span><i><span style=\"font-weight: 400;\">k<\/span><\/i><span style=\"font-weight: 400;\"> buah bilangan sehingga terbentuk barisan aritmetika baru, beda dan banyak suku dari barisan tersebut akan berubah sesuai rumusan berikut.<\/span><\/p>\n<p><a href=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2019\/12\/Capture-3.png\" data-rel=\"penci-gallery-image-content\" ><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-280116\" src=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2019\/12\/Capture-3.png\" alt=\"beda dan banyak suku dari barisan\" width=\"102\" height=\"74\"><\/a><\/p>\n<p><span style=\"font-weight: 400;\">Keterangan:<\/span><\/p>\n<p><span style=\"font-weight: 400;\"><em>b&#8217;<\/em>=<\/span><span style=\"font-weight: 400;\"> beda barisan aritmetika baru;<\/span><\/p>\n<p><span style=\"font-weight: 400;\"><em>b<\/em>=<\/span><span style=\"font-weight: 400;\"> beda barisan aritmetika lama;<\/span><\/p>\n<p><span style=\"font-weight: 400;\"><em>k<\/em>=<\/span><span style=\"font-weight: 400;\"> banyak bilangan yang disisipkan;<\/span><\/p>\n<p><em><span style=\"font-weight: 400;\">n<\/span><span style=\"font-weight: 400;\">&#8216;<\/span><\/em><span style=\"font-weight: 400;\">=<\/span><span style=\"font-weight: 400;\"> banyak suku barisan aritmetika baru; dan<\/span><\/p>\n<p><span style=\"font-weight: 400;\"><em>n<\/em>=<\/span><span style=\"font-weight: 400;\"> banyak suku barisan aritmetika lama.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Perlu diingat bahwa suku pertama barisan baru sama dengan suku pertama barisan lama. <\/span><\/p>\n<h3><b>2. Suku ke-<\/b><b><i>n<\/i><\/b><b> barisan aritmetika<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">Saat Quipperian diminta untuk mencari suku ke-<\/span><i><span style=\"font-weight: 400;\">n<\/span><\/i><span style=\"font-weight: 400;\"> dari barisan aritmetika, cara termudahnya adalah dengan menelusuri satu per satu sampai mencapai suku ke-<\/span><i><span style=\"font-weight: 400;\">n<\/span><\/i><span style=\"font-weight: 400;\">. Namun, cara ini tergolong tidak praktis dan membutuhkan banyak waktu. Jika yang diminta suku ke-10 mungkin masih bisa. Bagaimana jika yang diminta suku ke-1000? Kebayang kan betapa rumitnya? Untuk itu, rumus suku ke-<\/span><i><span style=\"font-weight: 400;\">n<\/span><\/i><span style=\"font-weight: 400;\"> yang bisa kamu gunakan adalah sebagai berikut.<\/span><\/p>\n<p><span style=\"font-weight: 400;\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-278039\" src=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2019\/12\/Barisan-dan-Deret-Matematika-Kelas-11-4.png\" alt=\"\" width=\"159\" height=\"66\">&nbsp;<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Keterangan:<\/span><\/p>\n<p><i><span style=\"font-weight: 400;\">a<\/span><\/i><span style=\"font-weight: 400;\"> = suku awal (<\/span><i><span style=\"font-weight: 400;\">U<\/span><\/i><i><span style=\"font-weight: 400;\">1<\/span><\/i><span style=\"font-weight: 400;\">);<\/span><\/p>\n<p><em><span style=\"font-weight: 400;\">U<\/span><\/em><sub><em><span style=\"font-weight: 400;\">n<\/span><\/em><\/sub> <span style=\"font-weight: 400;\">= suku ke-<\/span><i><span style=\"font-weight: 400;\">n<\/span><\/i><span style=\"font-weight: 400;\">; dan<\/span><\/p>\n<p><i><span style=\"font-weight: 400;\">b<\/span><\/i><span style=\"font-weight: 400;\"> = beda atau selisih.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Agar kamu lebih paham, yuk simak contoh soal berikut.<\/span><\/p>\n<h3><b>Contoh soal 1<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">Tentukan suku ke-20 dari barisan 2, 6, 10, 14, \u2026, \u2026,!<\/span><\/p>\n<p><strong>Pembahasan:<\/strong><\/p>\n<p><span style=\"font-weight: 400;\">Diketahui:<\/span><\/p>\n<p><i><span style=\"font-weight: 400;\">a<\/span><\/i><span style=\"font-weight: 400;\"> = 2<\/span><\/p>\n<p><i><span style=\"font-weight: 400;\">b<\/span><\/i><span style=\"font-weight: 400;\"> = 6 \u2013 2 = 4<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Ditanya: <\/span><em>U<sub>20<\/sub><\/em><span style=\"font-weight: 400;\">&nbsp;=\u2026?<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Pembahasan:<\/span><\/p>\n<p><span style=\"font-weight: 400;\"> <img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-278038\" src=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2019\/12\/Barisan-dan-Deret-Matematika-Kelas-11-5.png\" alt=\"\" width=\"177\" height=\"146\"><\/span><\/p>\n<h3><b>3. Suku tengah barisan aritmetika<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">Jika Quipperian menemukan barisan aritmetika yang banyak sukunya ganjil, pasti barisan aritmetika tersebut memiliki suku tengah (<\/span><em><span style=\"font-weight: 400;\">U<\/span><\/em><sub><em><span style=\"font-weight: 400;\">t<\/span><\/em><\/sub><span style=\"font-weight: 400;\">). Secara matematis, <\/span><em><span style=\"font-weight: 400;\">U<\/span><\/em><sub><em><span style=\"font-weight: 400;\">t<\/span><\/em><\/sub><span style=\"font-weight: 400;\"> dirumuskan sebagai berikut.<\/span><\/p>\n<p><span style=\"font-weight: 400;\"> <img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-278037\" src=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2019\/12\/Barisan-dan-Deret-Matematika-Kelas-11-6.png\" alt=\"\" width=\"166\" height=\"219\"><\/span><\/p>\n<p><span style=\"font-weight: 400;\">Untuk lebih jelasnya, perhatikan contoh soal berikut.<\/span><\/p>\n<h3><b>Contoh soal 2<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">Suku tengah barisan aritmetika adalah 15. Jika banyaknya suku barisan tersebut 11 dan suku ke-4 bernilai -3, tentukan suku terakhirnya!<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Pembahasan:<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Diketahui:<\/span><\/p>\n<p><em>U<sub>t<\/sub><\/em><span style=\"font-weight: 400;\"> = 15<\/span><\/p>\n<p><i><span style=\"font-weight: 400;\">n<\/span><\/i><span style=\"font-weight: 400;\"> = 11<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Ditanya: <em>U<\/em><sub><em>n<\/em><\/sub><\/span>&nbsp;<span style=\"font-weight: 400;\">=\u2026?<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Pembahasan:<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Pertama, Quipperian harus mencari nilai <\/span><i><span style=\"font-weight: 400;\">t<\/span><\/i><span style=\"font-weight: 400;\">.<\/span><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-278036\" src=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2019\/12\/Barisan-dan-Deret-Matematika-Kelas-11-7.png\" alt=\"\" width=\"111\" height=\"134\"><\/p>\n<p><span style=\"font-weight: 400;\">Suku tengah adalah suku ke-6. Artinya, <\/span><em>U<sub>6<\/sub><\/em><span style=\"font-weight: 400;\">&nbsp;= 15.<\/span><\/p>\n<p><span style=\"font-weight: 400;\"> <img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-278035\" src=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2019\/12\/Barisan-dan-Deret-Matematika-Kelas-11-8.png\" alt=\"\" width=\"190\" height=\"86\"><\/span><\/p>\n<p><span style=\"font-weight: 400;\">Untuk mencari nilai <\/span><i><span style=\"font-weight: 400;\">a<\/span><\/i><span style=\"font-weight: 400;\"> dan <\/span><i><span style=\"font-weight: 400;\">b<\/span><\/i><span style=\"font-weight: 400;\">, gunakan metode eliminasi.<\/span><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-278034\" src=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2019\/12\/Barisan-dan-Deret-Matematika-Kelas-11-9.png\" alt=\"\" width=\"126\" height=\"123\"><\/p>\n<p><span style=\"font-weight: 400;\">Substitusikan nilai <\/span><i><span style=\"font-weight: 400;\">b<\/span><\/i><span style=\"font-weight: 400;\"> ke persamaan (1).<\/span><\/p>\n<p><span style=\"font-weight: 400;\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-278033\" src=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2019\/12\/Barisan-dan-Deret-Matematika-Kelas-11-10.png\" alt=\"\" width=\"150\" height=\"109\">&nbsp;<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Selanjutnya, tentukan suku terakhir barisan tersebut.<\/span><\/p>\n<p><span style=\"font-weight: 400;\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-278032\" src=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2019\/12\/Barisan-dan-Deret-Matematika-Kelas-11-11.png\" alt=\"\" width=\"155\" height=\"101\">&nbsp;<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Jadi, suku terakhirnya adalah 60.<\/span><\/p>\n<h3><b>4. Sisipan bilangan pada barisan aritmetika<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">Misalkan Quipperian menjumpai barisan aritemtika dengan beda <\/span><i><span style=\"font-weight: 400;\">b<\/span><\/i><span style=\"font-weight: 400;\">. Lalu, barisan aritmetika tersebut disisipi <\/span><i><span style=\"font-weight: 400;\">k<\/span><\/i><span style=\"font-weight: 400;\"> bilangan di setiap 2 bilangan yang berdekatan. Setelah disisipi <\/span><i><span style=\"font-weight: 400;\">k<\/span><\/i><span style=\"font-weight: 400;\"> bilangan, terbentuk barisan aritmetika baru yang bedanya <\/span><i><span style=\"font-weight: 400;\">b\u2019<\/span><\/i><span style=\"font-weight: 400;\">. Pertanyaannya adalah berapakah beda bilangan aritmetika yang baru? Daripada pusing-pusing, gunakan persamaan berikut.<\/span><\/p>\n<p><span style=\"font-weight: 400;\"> <img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-278031\" src=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2019\/12\/Barisan-dan-Deret-Matematika-Kelas-11-12.png\" alt=\"\" width=\"127\" height=\"86\"><\/span><\/p>\n<p><span style=\"font-weight: 400;\">Ketentuannya, suku pertama barisan yang baru sama dengan suku pertama barisan sebelumnya karena bilangan yang disisipkan tidak berada di awal baris.<\/span><\/p>\n<h2><b>Deret Aritmetika<\/b><\/h2>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-278051\" src=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2019\/12\/Barisan-dan-Deret-Matematika-Kelas-11-b.png\" alt=\"\" width=\"800\" height=\"533\" srcset=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2019\/12\/Barisan-dan-Deret-Matematika-Kelas-11-b.png 800w, https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2019\/12\/Barisan-dan-Deret-Matematika-Kelas-11-b-300x200.png 300w, https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2019\/12\/Barisan-dan-Deret-Matematika-Kelas-11-b-768x512.png 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/p>\n<p><span style=\"font-weight: 400;\">Deret aritmetika berkaitan dengan barisan aritmetika. Deret aritmetika yang disimbolkan dengan <\/span><span style=\"font-weight: 400;\">S<\/span><span style=\"font-weight: 400;\">n<\/span><span style=\"font-weight: 400;\"> merupakan jumlah <\/span><i><span style=\"font-weight: 400;\">n<\/span><\/i><span style=\"font-weight: 400;\"> suku pertama barisan aritmetika. Dengan kata lain, penjumlahan dari suku-suku barisan aritmetika disebut dengan deret aritmetika. <\/span><\/p>\n<p><a href=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2019\/12\/Capture-4.png\" data-rel=\"penci-gallery-image-content\" ><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-280119\" src=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2019\/12\/Capture-4.png\" alt=\"suku-suku barisan aritmetika disebut dengan deret aritmetika\" width=\"396\" height=\"50\" srcset=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2019\/12\/Capture-4.png 396w, https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2019\/12\/Capture-4-300x38.png 300w\" sizes=\"(max-width: 396px) 100vw, 396px\" \/><\/a><\/p>\n<p><span style=\"font-weight: 400;\">Rumus jumlah <\/span><i><span style=\"font-weight: 400;\">n<\/span><\/i><span style=\"font-weight: 400;\"> suku pertama dari deret aritmetika tersebut adalah sebagai berikut.<\/span><\/p>\n<p><a href=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2019\/12\/Capture-5.png\" data-rel=\"penci-gallery-image-content\" ><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-280122\" src=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2019\/12\/Capture-5.png\" alt=\"Rumus jumlah n suku pertama dari deret aritmetika\" width=\"117\" height=\"48\"><\/a><\/p>\n<p><span style=\"font-weight: 400;\">Substitusikan <\/span><em><span style=\"font-weight: 400;\">U<\/span><span style=\"font-weight: 400;\">n<\/span><span style=\"font-weight: 400;\">=a+(<\/span><span style=\"font-weight: 400;\">n-1)<\/span><span style=\"font-weight: 400;\"> b<\/span><\/em><span style=\"font-weight: 400;\">, sehingga diperoleh:<\/span><\/p>\n<p><a href=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2019\/12\/Capture-6.png\" data-rel=\"penci-gallery-image-content\" ><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-280124\" src=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2019\/12\/Capture-6.png\" alt=\"Substitusikan Un=a+n-1 b\" width=\"161\" height=\"49\"><\/a><\/p>\n<p><span style=\"font-weight: 400;\">Misalkan <\/span><em><span style=\"font-weight: 400;\">S<\/span><span style=\"font-weight: 400;\">n-1<\/span><span style=\"font-weight: 400;\">= U<sub>1 <\/sub><\/span><span style=\"font-weight: 400;\">+U<sub>2<\/sub><\/span><span style=\"font-weight: 400;\">+ U<sub>3<\/sub><\/span><span style=\"font-weight: 400;\">+ \u2026 +U<sub>n-1<\/sub><\/span><span style=\"font-weight: 400;\"> dan S<sub>n<\/sub><\/span><span style=\"font-weight: 400;\">=U<sub>1<\/sub><\/span><span style=\"font-weight: 400;\">+U<sub>2<\/sub><\/span><span style=\"font-weight: 400;\">+ U<sub>3<\/sub><\/span><span style=\"font-weight: 400;\">+\u2026+U<sub>n-1<\/sub><\/span><span style=\"font-weight: 400;\">+U<sub>n<\/sub><\/span><\/em><span style=\"font-weight: 400;\"><em>.<\/em> Ini berarti, hubungan antara <em>S<sub>n-1<\/sub><\/em><\/span><span style=\"font-weight: 400;\"> dan <em>U<sub>n <\/sub><\/em><\/span><span style=\"font-weight: 400;\">adalah sebagai berikut.<\/span><\/p>\n<p><a href=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2019\/12\/Capture-7.png\" data-rel=\"penci-gallery-image-content\" ><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-280128\" src=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2019\/12\/Capture-7.png\" alt=\"hubungan antara Sn-1 dan Sn\" width=\"230\" height=\"39\"><\/a><\/p>\n<p><span style=\"font-weight: 400;\">Mungkin terasa hambar jika belum dilengkapi contoh soal ya? Tak usah khawatir, berikut ini contoh soal berkaitan dengan deret aritmetika.<\/span><\/p>\n<h3><b>Contoh soal 3<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">Berapakah jumlah bilangan kelipatan 3 antara 10 sampai 100?<\/span><\/p>\n<p><b>Pembahasan:<\/b><\/p>\n<p><span style=\"font-weight: 400;\">Jumlah bilangan kelipatan 3 antara 10 sampai 100 adalah sebagai berikut.<\/span><\/p>\n<p><span style=\"font-weight: 400;\"> <img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-278027\" src=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2019\/12\/Barisan-dan-Deret-Matematika-Kelas-11-16.png\" alt=\"\" width=\"230\" height=\"58\"><\/span><\/p>\n<p><span style=\"font-weight: 400;\">Keterangan:<\/span><\/p>\n<p><i><span style=\"font-weight: 400;\">a<\/span><\/i><span style=\"font-weight: 400;\"> = 12<\/span><\/p>\n<p><span style=\"font-weight: 400;\">banyaknya suku = 30<\/span><\/p>\n<p><span style=\"font-weight: 400;\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-278026\" src=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2019\/12\/Barisan-dan-Deret-Matematika-Kelas-11-17.png\" alt=\"\" width=\"148\" height=\"162\">&nbsp;<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Jadi, jumlah bilangan kelipatan 3 antara 10 sampai 100 adalah 1.665.<\/span><\/p>\n<h2><b>Barisan Geometri<\/b><\/h2>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-278050\" src=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2019\/12\/Barisan-dan-Deret-Matematika-Kelas-11-c.png\" alt=\"\" width=\"800\" height=\"533\" srcset=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2019\/12\/Barisan-dan-Deret-Matematika-Kelas-11-c.png 800w, https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2019\/12\/Barisan-dan-Deret-Matematika-Kelas-11-c-300x200.png 300w, https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2019\/12\/Barisan-dan-Deret-Matematika-Kelas-11-c-768x512.png 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/p>\n<p><span style=\"font-weight: 400;\">Apa sih barisan geometri itu? Lalu apa bedanya dengan barisan aritmetika? <\/span><span style=\"font-weight: 400;\">Barisan geometri merupakan barisan bilangan yang hasil bagi antara dua suku berurutannya selalu sama atau tetap. Perbandingan (hasil bagi) antara dua suku berurutan pada barisan geometri disebut dengan <\/span><b>rasio<\/b><span style=\"font-weight: 400;\"> yang dilambangkan dengan <\/span><span style=\"font-weight: 400;\">r<\/span><span style=\"font-weight: 400;\">.<\/span><\/p>\n<h3><b>1. Bentuk barisan geometri<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">Rumus untuk menentukan rasio pada barisan geometri adalah sebagai berikut.<\/span><\/p>\n<p><a href=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2019\/12\/Capture-8.png\" data-rel=\"penci-gallery-image-content\" ><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-280130\" src=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2019\/12\/Capture-8.png\" alt=\"Rumus untuk menentukan rasio pada barisan geometri\" width=\"174\" height=\"54\"><\/a><\/p>\n<p>Keterangan:<br \/>\n<em>r<\/em> = rasio;<br \/>\n<em>Un<\/em> = suku ke-n;<br \/>\n<em>Un<\/em>-1= suku sebelum suku ke-n; dan<br \/>\n<em>n<\/em> = banyaknya suku.<\/p>\n<h3><b>2. Suku ke-<\/b><b><i>n<\/i><\/b><b> barisan geometri<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">Suku ke-<\/span><i><span style=\"font-weight: 400;\">n<\/span><\/i><span style=\"font-weight: 400;\"> masih bisa kamu tentukan selama nilai <\/span><i><span style=\"font-weight: 400;\">n<\/span><\/i><span style=\"font-weight: 400;\"> belum terlalu besar. Namun, jika nilai <\/span><i><span style=\"font-weight: 400;\">n<\/span><\/i><span style=\"font-weight: 400;\"> cukup besar, cara seperti itu sulit untuk dilakukan. Untuk memudahkan kamu dalam menghitung suku ke-<\/span><i><span style=\"font-weight: 400;\">n<\/span><\/i><span style=\"font-weight: 400;\"> barisan geometri, gunakan persamaan berikut.<\/span><\/p>\n<p><span style=\"font-weight: 400;\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-278024\" src=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2019\/12\/Barisan-dan-Deret-Matematika-Kelas-11-19.png\" alt=\"\" width=\"122\" height=\"67\">&nbsp;<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Akibat dari rumus suku ke-<\/span><span style=\"font-weight: 400;\">n<\/span><span style=\"font-weight: 400;\"> tersebut, dapat diperoleh<\/span><\/p>\n<p><a href=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2019\/12\/Capture-9.png\" data-rel=\"penci-gallery-image-content\" ><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-280134\" src=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2019\/12\/Capture-9.png\" alt=\"rumus suku ke-n\" width=\"269\" height=\"80\"><\/a><\/p>\n<p>Jika banyak suku (n) ganjil, suku tengah (Ut) barisan geometri dapat dirumuskan sebagai berikut.<\/p>\n<p><a href=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2019\/12\/Capture-10.png\" data-rel=\"penci-gallery-image-content\" ><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-280136\" src=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2019\/12\/Capture-10.png\" alt=\"banyak suku (n) ganjil, suku tengah (Ut)\" width=\"227\" height=\"45\"><\/a><\/p>\n<p>Sementara itu, jika di antara dua buah suku U1,U2,U3,\u2026,Un disisipkan k buah bilangan sehingga terbentuk barisan geometri baru, rasio dan banyak suku dari barisan tersebut akan berubah sesuai rumusan berikut.<\/p>\n<p><a href=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2019\/12\/Capture-11.png\" data-rel=\"penci-gallery-image-content\" ><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-280138\" src=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2019\/12\/Capture-11.png\" alt=\"rasio dan banyak suku dari barisan\" width=\"108\" height=\"64\"><\/a><\/p>\n<p>Keterangan:<br \/>\nr&#8217;= rasio barisan geometri baru;<br \/>\nr= rasio barisan geometri lama;<br \/>\nk= banyak suku yang disisipkan;<br \/>\nn&#8217;= banyak suku barisan geometri baru; dan<br \/>\nn= banyak suku barisan geometri lama.<\/p>\n<p>Perlu diingat bahwa suku pertama barisan baru sama dengan suku pertama barisan lama.<\/p>\n<p><span style=\"font-weight: 400;\">Dengan <\/span><i><span style=\"font-weight: 400;\">a<\/span><\/i><span style=\"font-weight: 400;\"> merupakan suku pertama atau <\/span><i><span style=\"font-weight: 400;\">U<\/span><\/i><i><span style=\"font-weight: 400;\">1<\/span><\/i><span style=\"font-weight: 400;\">. Untuk mengasah kemampuanmu, simak contoh soal berikut ini.<\/span><\/p>\n<h3><b>Contoh soal 4<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">Diketahui suku ke-2 dan ke-4 barisan geometri berturut-turut adalah 12 dan 27. Jika nilai <\/span><i><span style=\"font-weight: 400;\">r<\/span><\/i><span style=\"font-weight: 400;\"> &gt; 0, tentukan nilai dari suku ke-3!<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Pembahasan:<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Diketahui:<\/span><\/p>\n<p><em><span style=\"font-weight: 400;\">U<\/span><\/em><sub><em><span style=\"font-weight: 400;\">2<\/span><\/em><\/sub><span style=\"font-weight: 400;\"> = 12<\/span><\/p>\n<p><em><span style=\"font-weight: 400;\">U<\/span><\/em><sub><em><span style=\"font-weight: 400;\">4<\/span><\/em><\/sub><span style=\"font-weight: 400;\"> = 27<\/span><\/p>\n<p><i><span style=\"font-weight: 400;\">r<\/span><\/i><span style=\"font-weight: 400;\"> &gt; 0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Ditanya: <\/span><em>U<sub>3<\/sub><\/em><span style=\"font-weight: 400;\">&nbsp;=\u2026?<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Pembahasan:<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Nyatakan suku ke-2 dan ke-4 dalam notasi matematis.<\/span><\/p>\n<p><span style=\"font-weight: 400;\"> <img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-278023\" src=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2019\/12\/Barisan-dan-Deret-Matematika-Kelas-11-20.png\" alt=\"\" width=\"134\" height=\"80\"><\/span><\/p>\n<p><span style=\"font-weight: 400;\">Lakukan pembagian antara kedua suku seperti berikut.<\/span><\/p>\n<p><span style=\"font-weight: 400;\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-278022\" src=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2019\/12\/Barisan-dan-Deret-Matematika-Kelas-11-21.png\" alt=\"\" width=\"118\" height=\"206\">&nbsp;<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Setelah rasio diketahui, tentukan suku ke-3nya.<\/span><\/p>\n<p><span style=\"font-weight: 400;\"> <img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-278021\" src=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2019\/12\/Barisan-dan-Deret-Matematika-Kelas-11-22.png\" alt=\"\" width=\"124\" height=\"129\"><\/span><\/p>\n<p><span style=\"font-weight: 400;\">Jadi, nilai dari suku ke-3 adalah 18.<\/span><\/p>\n<h3><b>3. Suku tengah barisan geometri<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">Sama halnya barisan aritmetika. Pada barisan geometri yang banyak sukunya ganjil, suku tengahnya bisa diperoleh dengan persamaan berikut.<\/span><\/p>\n<p><span style=\"font-weight: 400;\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-278020\" src=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2019\/12\/Barisan-dan-Deret-Matematika-Kelas-11-23.png\" alt=\"\" width=\"170\" height=\"136\">&nbsp;<\/span><\/p>\n<h3><b>4. Sisipan pada barisan geometri<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">Misalkan Quipperian menjumpai barisan geometri dengan rasio <\/span><i><span style=\"font-weight: 400;\">r<\/span><\/i><span style=\"font-weight: 400;\">. Lalu, barisan geometri tersebut disisipi <\/span><i><span style=\"font-weight: 400;\">k<\/span><\/i><span style=\"font-weight: 400;\"> bilangan di setiap 2 bilangan yang berdekatan. Setelah disisipi <\/span><i><span style=\"font-weight: 400;\">k<\/span><\/i><span style=\"font-weight: 400;\"> bilangan, terbentuk barisan geometri baru yang rasionya <\/span><i><span style=\"font-weight: 400;\">k\u2019<\/span><\/i><span style=\"font-weight: 400;\">. Pertanyaanya adalah berapakah rasio barisan geometri yang baru? Untuk memudahkan Quipperian, gunakan persamaan berikut.<\/span><\/p>\n<p><span style=\"font-weight: 400;\"> <img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-278019\" src=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2019\/12\/Barisan-dan-Deret-Matematika-Kelas-11-24.png\" alt=\"\" width=\"117\" height=\"63\"><\/span><\/p>\n<h2><b>Deret Geometri<\/b><\/h2>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-278049\" src=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2019\/12\/Barisan-dan-Deret-Matematika-Kelas-11-d.jpg\" alt=\"\" width=\"800\" height=\"533\" srcset=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2019\/12\/Barisan-dan-Deret-Matematika-Kelas-11-d.jpg 800w, https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2019\/12\/Barisan-dan-Deret-Matematika-Kelas-11-d-300x200.jpg 300w, https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2019\/12\/Barisan-dan-Deret-Matematika-Kelas-11-d-768x512.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/p>\n<p><span style=\"font-weight: 400;\">Jumlah suku ke-<\/span><i><span style=\"font-weight: 400;\">n<\/span><\/i><span style=\"font-weight: 400;\"> pertama dari suku-suku barisan geometri disebut sebagai deret geometri berhingga. Mengapa disebut berhingga? Karena memiliki suku akhir tertentu. Apakah mungkin ada deret geometri tak hingga? Mungkin saja sih. Pembahasan deret geometri tak hingga bisa kamu dapatkan di pembahasan Quipper Blog selanjutnya. Secara matematis, jumlah suku ke-<\/span><i><span style=\"font-weight: 400;\">n<\/span><\/i><span style=\"font-weight: 400;\"> pertama barisan geometri dirumuskan sebagai berikut.<\/span><\/p>\n<p><span style=\"font-weight: 400;\"> <img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-278018\" src=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2019\/12\/Barisan-dan-Deret-Matematika-Kelas-11-25.png\" alt=\"\" width=\"299\" height=\"143\"><\/span><\/p>\n<p><span style=\"font-weight: 400;\">Agar belajarmu lebih afdal, simak contoh soal terkait deret geometri berikut.<\/span><\/p>\n<h3><b>Contoh soal 5<\/b><\/h3>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-278017\" src=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2019\/12\/Barisan-dan-Deret-Matematika-Kelas-11-26.png\" alt=\"\" width=\"615\" height=\"103\" srcset=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2019\/12\/Barisan-dan-Deret-Matematika-Kelas-11-26.png 615w, https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2019\/12\/Barisan-dan-Deret-Matematika-Kelas-11-26-300x50.png 300w\" sizes=\"(max-width: 615px) 100vw, 615px\" \/><\/p>\n<p><span style=\"font-weight: 400;\">Pembahasan:<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Diketahui:<\/span><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-278016\" src=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2019\/12\/Barisan-dan-Deret-Matematika-Kelas-11-27.png\" alt=\"\" width=\"147\" height=\"81\"><\/p>\n<p><span style=\"font-weight: 400;\">Ditanya: <\/span><i><span style=\"font-weight: 400;\">r<\/span><\/i><span style=\"font-weight: 400;\"> =\u2026?<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Pembahasan:<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Pertama, Quipperian harus mencari suku pertama dan kedua barisan tersebut.<\/span><\/p>\n<p><span style=\"font-weight: 400;\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-278015\" src=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2019\/12\/Barisan-dan-Deret-Matematika-Kelas-11-28.png\" alt=\"\" width=\"140\" height=\"165\">&nbsp;<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Selanjutnya, tentukan jumlah 2 suku pertama barisan geometri tersebut.<\/span><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-278014\" src=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2019\/12\/Barisan-dan-Deret-Matematika-Kelas-11-29.png\" alt=\"\" width=\"149\" height=\"169\"><\/p>\n<p><span style=\"font-weight: 400;\">Tentukan suku ke-2nya.<\/span><\/p>\n<p><span style=\"font-weight: 400;\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-278013\" src=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2019\/12\/Barisan-dan-Deret-Matematika-Kelas-11-30.png\" alt=\"\" width=\"118\" height=\"86\">&nbsp;<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Tentukan rasionya!<\/span><\/p>\n<p><span style=\"font-weight: 400;\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-278012\" src=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2019\/12\/Barisan-dan-Deret-Matematika-Kelas-11-31.png\" alt=\"\" width=\"85\" height=\"140\">&nbsp;<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Jadi, rasio barisan geometri tersebut adalah 3.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Di awal pertemuan ini, Quipperian diajak untuk menghitung berapa keuntungan setelah berinvestasi selama 10 bulan? Penasaran? <\/span><i><span style=\"font-weight: 400;\">Check check this out<\/span><\/i><span style=\"font-weight: 400;\">!<\/span><\/p>\n<h3><b>Contoh soal 6<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">Kamu berinvestasi sebesar Rp10.000.000. Pada bulan pertama kamu investasi, keuntungan yang diperoleh adalah Rp2.000. Pada bulan kedua, keuntungannya menjadi Rp4.000 dan bulan ketiga menjadi Rp8.000. Kira-kira berapa keuntungan yang kamu dapatkan setelah 10 bulan berinvestasi? Dan berapa total uang yang bisa kamu kumpulkan setelah berinvestasi selama 10 bulan?<\/span><\/p>\n<p><b>Pembahasan:<\/b><\/p>\n<p><span style=\"font-weight: 400;\">Pada kondisi tersebut, keuntungan setiap bulan merupakan kelipatan 2 dari bulan sebelumnya. Artinya, jika dibentuk barisan, keuntungan tersebut akan menjadi barisan geometri, yaitu Rp2.000, Rp4.000, Rp8.000, \u2026,<\/span><em><span style=\"font-weight: 400;\">U<\/span><\/em><sub><em><span style=\"font-weight: 400;\">n<\/span><\/em><\/sub><span style=\"font-weight: 400;\">. Setelah 10 bulan, keuntungannya akan menjadi:<\/span><\/p>\n<p><span style=\"font-weight: 400;\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-278011\" src=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2019\/12\/Barisan-dan-Deret-Matematika-Kelas-11-32.png\" alt=\"\" width=\"278\" height=\"165\">&nbsp;<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Jadi, keuntungan yang akan kamu dapatkan setelah berinvestasi selama 10 bulan adalah Rp2.046.000 dengan total uang mencapai Rp10.000.000 + Rp2.046.000 = Rp12.046.000.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Apakah Quipperian semakin paham dengan materi baris dan deret ini? Jika sudah paham, cobalah kamu asah kemampuan dengan banyak berlatih mengerjakan soal. Soal-soal itu bisa kamu dapatkan di Quipper Video. Quipper Video menyediakan ribuan soal beserta pembahasannya yang bisa kamu kerjakan kapanpun dan dimanapun. So tunggu apa lagi? Bersama Quipper Video, belajar jadi lebih mudah dan menyenangkan. Salam Quipper!<\/span><\/p>\n<p>&nbsp;<\/p>\n<p><b>Penulis: Eka Viandari<\/b><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Hai Quipperian, bagaimana kabarnya? Semoga selalu sehat dan tetap semangat, ya! Pada pertemuan kali ini, Quipper Blog akan membahas tentang baris dan deret. Konsep&hellip;<\/p>\n","protected":false},"author":99400369,"featured_media":278048,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_crdt_document":"","_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[679384888,679384865],"tags":[679384518],"ppma_author":[679386827,679386836],"class_list":["post-278008","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-mapel","category-matematika","tag-matematika-kelas-11"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Barisan dan Deret Rumus serta Contoh Soal - Matematika Kelas 11 - Quipper Blog<\/title>\n<meta name=\"description\" content=\"Quipperian, pada artikel kali ini Quipper Blog akan membahas materi barisan dan deret. 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