已知公差不为零的等差数列
的前
项和为
,若
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aceab85ad533c7c1547393104761a145.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/acae0a5b1a0b507499113b3c1db6abc8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aceab85ad533c7c1547393104761a145.png)
更新时间:2021-05-08 22:50:39
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【推荐1】已知等比数列
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
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