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7.一等比級數的首項為3，末項為384，和是765，試求其公
Mar 8th 2014, 04:41

知識問題|

發問者： 鮮兒 ( 初學者 5 級)
發問時間： 2014-03-08 12:41:39 ( 還有 4 天發問到期 )
解答贈點： 5 ( 共有 0 人贊助 )
回答： 0 0

7.一等比級數的首項為3，末項為384，和是765，試求其公比。
8.一等比級數的公比為-2，前6項的和為-42，試求此等比級數的第10項。

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