数列
的前
项的和
,则此数列的通项公式![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3f7fda69e2b32b9ced2239f915fa59b.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/bbf189665f0945b9d5bc9c2f354c7844.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3f7fda69e2b32b9ced2239f915fa59b.png)
更新时间:2020-12-21 21:38:13
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【知识点】 由Sn求通项公式
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【推荐1】已知数列
的前
项和
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为数列
的前
项和,若
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解题方法
【推荐2】已知数列
的前
项和为
,数列
是首项为
,公差为
的等差数列,则
的通项公式为_________ ;若
表示不超过
的最大整数,如
,
,则数列
的前
项的和为_________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
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