若数列
为等差数列,
为其前n项和,且
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc4e70b360f988fdbd92300ab22c4613.png)
_________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e61a0c59c1f42430701988e028c23ab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc4e70b360f988fdbd92300ab22c4613.png)
更新时间:2021-04-03 09:24:41
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相似题推荐
填空题-单空题
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容易
(0.94)
【推荐1】已知等差数列
的前
项和为
,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5af1f1b7e9e20d799ee3c06b89a0611c.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/389365dbf6a60d3d2577e7ba2ef81f9b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5af1f1b7e9e20d799ee3c06b89a0611c.png)
您最近一年使用:0次
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(0.94)
名校
【推荐2】已知
是等差数列, 且
,则
_________ .
![](https://img.xkw.com/dksih/QBM/2012/12/23/1571079424860160/1571079430250496/STEM/62a277977e8349d4a897ff406a6325a4.png?resizew=31)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82f5c6fd2aef96ec03d4a856b3e5a417.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d0c134f914b44e181db0154e3be7567.png)
您最近一年使用:0次
填空题-单空题
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(0.94)
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【推荐1】已知
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c18b9f529c2df3509387ca90a10c8d8.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05a8e2736736c0fcda6faaaf15839d76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c18b9f529c2df3509387ca90a10c8d8.png)
您最近一年使用:0次
填空题-单空题
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容易
(0.94)
名校
解题方法
【推荐2】已知等差数列
的前n项和为
,且
,
,则数列
的公差![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c98c59cd4749afdd21e73529fc84323.png)
_________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2693734765399876e9e93cdb110231c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2fcd86b9ed6819116a261629f96fae1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c98c59cd4749afdd21e73529fc84323.png)
您最近一年使用:0次