October 2018 1 80 Report
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1. rasio suatu deret geometri -3, dan suku kelimanya sama dg 162. tentukan suku pertama dan jumlah 8 suku pertama.

2. tiga suku pertama barisan geometri adl x-3, 2x-5, dan 2x+1. tentukan nilai x yg memenuhi dan jmlh lima suku pertama dari deret yg sesuai dg barisan tsbt.
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