Mathematics
Senior High
等比数列の和を求める？
初
(3) 8,4,2,1, 、項数n
3
- -5そ
91
81
-番
4f
0pa ()
(4) 3+6+12+24+ +384
5.初項5、公比一2の等比数列で初項から第何項
までの和が215になるか。
lo0
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