若数列
满足
,且
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3bb7147e313f9d9f67d19ecb5f499c05.png)
________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b70b8193085a98b7adac26d373bf4a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1bae03ee4ac75dacfb026290e4207dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3bb7147e313f9d9f67d19ecb5f499c05.png)
更新时间:2018-08-03 11:35:42
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【知识点】 由递推关系证明数列是等差数列
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【推荐1】设
是数列
的前n项和,且
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aab70cb684eeb1cbc3b294251f7da63b.png)
_________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4cf228a301549a577499dc753ac1405.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aab70cb684eeb1cbc3b294251f7da63b.png)
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