1 . 已知数列
的前n项和为
,且
.
(1)求数列
的通项公式;
(2)若数列
满足
,设
,求
.
![](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/b8865af6a390b8246ba1d061e50cea82.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)若数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb2269ba55153e56496df514f94de837.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c03f3d56c5862659f79b42475defafe8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
您最近一年使用:0次
2020-04-30更新
|
169次组卷
|
3卷引用:湖北省襄阳市第一中学2019-2020学年高二下学期2月月考数学试题
2 . 在等差数列
中,已知公差
,
,
.
求数列
的通项公式;
求数列
的前n项和.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe229b24e2d56ff6b491725ceae4ff2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cfe23848f9ed53463f2d75885c56178.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1079d33578cb90119243ab0a01d6f8d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95f0fdc9ac560e5c71c3b9d80f734eeb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4141b26d2c32655003494a91ad6331b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe229b24e2d56ff6b491725ceae4ff2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65863c1abad833b79c303bfca24f535c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f25a99ba1a25d9d2ad4af39b5bd79fb5.png)
您最近一年使用:0次