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5有一等比數列前n項的和為 ,若 ,則 =?(A)50(B)60 (C)70(D)80
問題詳情
5有一等比數列前n項的和為
,若
,則
=?
(A)50
(B)60
(C)70
(D)80
參考答案
答案:C
難度:
計算中
-1
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