已知数列
是等差数列,其前
项和为
,
.
(1)求数列
的通项公式;
(2)求和:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.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/b3b5c23517835dd993de8ab05acf2359.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
(2)求和:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/170469cb1653e568c650df8906bb793d.png)
19-20高一下·贵州毕节·期中 查看更多[3]
贵州省毕节市实验高级中学2019-2020学年高一下学期期中考试数学试题(已下线)专题19 数列的求和-2020-2021学年高中数学新教材人教A版选择性必修配套提升训练广东省江门市新会陈经纶中学2022-2023学年高二下学期期中数学试题
更新时间:2020-06-02 09:14:44
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