若等比数列
的前
项和为
,且
,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dec6439c99c6a996a48b7d9e57c21208.png)
_______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dde0bc91b9174f0af48751f687b85b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2619b02a63414a15c2dae72cbffae3a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dec6439c99c6a996a48b7d9e57c21208.png)
更新时间:2020-03-19 16:45:52
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【知识点】 等比数列前n项和的基本量计算
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【推荐2】已知等比数列{an}为单调递增数列,设其前n项和为Sn,若a2=2,S3=7,则a5的值为________ .
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