
Deret Geometri
Presentation
•
Mathematics
•
10th Grade
•
Practice Problem
•
Hard
Siti Nurjanah
Used 2+ times
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7 Slides • 0 Questions
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Deret geometri adalah penjumlahan suku-suku dari barisan geometri.
Perbedaan mendasar barisan geometri dengan deret geometri adalah tanda penjumlahan. Dalam deret, kita akan diajak untuk menemukan hasil dari penjumlahan suku-sukunya.
Contoh sederhana dari deret geometri adalah: 1 + 4 + 16 + 64 + 256,….
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Keterangan:
Sn : jumlah suku pada deret geometri
a : suku pertama pada deret geometri
r : rasio pada deret geometri
n : banyaknya suku pada deret geometri
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Diketahui suatu deret sebagai berikut.
6 + 18 + 54 + …
Berapakah jumlah 8 suku pertama deret tersebut?
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Deret bilangan tersebut merupakan deret geometri dengan a = 6 dan r = 3.
Sehingga jumlah 8 suku pertama deret tersebut yaitu:
Jadi, jumlah 8 suku pertama deret tersebut adalah 19.680.
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Diketahui rumus deret geometri 3 + 6 + 12 + 24 + …. Dari deret tersebut, berapakah jumlah enam suku pertamanya?
Jawab
7
By Siti Nurjanah, S.Pd
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