名校
解题方法
1 . 在等差数列
中,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c43f5d0392cef546f47d63233e21e7a.png)
(1)求数列
的通项公式;
(2)设
,求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c43f5d0392cef546f47d63233e21e7a.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c3c2263e48afd4f7b961a1ed4539222.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f007ff257963f00a02b4bb12e6fa90ec.png)
您最近一年使用:0次
2022-02-15更新
|
1932次组卷
|
5卷引用:吉林省通化市梅河口市第五中学2021-2022学年高二上学期期中数学试题
2 . 已知等差数列
的前
项和为
,
,
.
(1)求数列
的通项公式
;
(2)求数列
的前
项和
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.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/b227fab760d5fa2d25642d7e3470dc38.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56275296a2092cea5a60d52e9fe00c00.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
(2)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/918149e1b37c738e4f424d8337d2b9aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
您最近一年使用:0次
2021-03-06更新
|
1577次组卷
|
5卷引用:江西省南昌市2021届高三下学期一调考试数学(文)试题
江西省南昌市2021届高三下学期一调考试数学(文)试题(已下线)第01周周练(4.1数列的概念4.2.1等差数列的概念4.2.2等差数列的前n项和公式)(基础卷)1.2等差数列检测题 A卷(基础巩固)宁夏回族自治区银川一中2024届高三上学期第二次月考数学(文)试题(已下线)1.2.2等差数列的前n项和公式(分层练习)-2023-2024学年高二数学同步精品课堂(北师大版2019选择性必修第二册)
真题
3 . 已知等差数列
前三项的和为
,前三项的积为
.
(Ⅰ)求等差数列
的通项公式;
(Ⅱ)若
,
,
成等比数列,求数列
的前
项和
![](https://img.xkw.com/dksih/QBM/2012/7/6/1570916918902784/1570916924055552/STEM/f3d7e422b1ec42e0b2cc12754dff0b4f.png)
![](https://img.xkw.com/dksih/QBM/2012/7/6/1570916918902784/1570916924055552/STEM/4bb6473af3a24ee98c35086418487885.png)
![](https://img.xkw.com/dksih/QBM/2012/7/6/1570916918902784/1570916924055552/STEM/e67ac633540642fbb2966eb7571a4394.png)
(Ⅰ)求等差数列
![](https://img.xkw.com/dksih/QBM/2012/7/6/1570916918902784/1570916924055552/STEM/f3d7e422b1ec42e0b2cc12754dff0b4f.png)
(Ⅱ)若
![](https://img.xkw.com/dksih/QBM/2012/7/6/1570916918902784/1570916924055552/STEM/536230435c664c618ba7865a24778a60.png)
![](https://img.xkw.com/dksih/QBM/2012/7/6/1570916918902784/1570916924055552/STEM/d12da681fcf744f9987e575c9da70e8e.png)
![](https://img.xkw.com/dksih/QBM/2012/7/6/1570916918902784/1570916924055552/STEM/dd170c75dda54066a364843f05a76bff.png)
![](https://img.xkw.com/dksih/QBM/2012/7/6/1570916918902784/1570916924055552/STEM/1af65eb238aa4dd281b265a10b3868ea.png)
![](https://img.xkw.com/dksih/QBM/2012/7/6/1570916918902784/1570916924055552/STEM/e04406319e044f0b9fc2009102156cfd.png)
您最近一年使用:0次
2016-12-01更新
|
3567次组卷
|
3卷引用:2012年全国普通高等学校招生统一考试理科数学(湖北卷)