设等差数列
的前
项和为
,若
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/280e06e2363bc8259840d58c361b612b.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://img.xkw.com/dksih/QBM/2016/10/12/1573065753673728/1573065759653888/STEM/068d0a52e3ed47508ebd728fbba95dbb.png?resizew=53)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/280e06e2363bc8259840d58c361b612b.png)
更新时间:2016-12-04 21:53:23
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【推荐1】记
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【推荐2】记
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