23-24高二上·江苏·课前预习
解题方法
1 . 在等差数列
中,
(1)已知
,求
与
;
(2)已知
,
,求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(1)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e64fcf95a1d93524ad425ab8a3628adb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e72adb45c60c2f63b46e65ff787302bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c02bc0c74292b1e8f395f90935d3174.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a71e56f374084c51b0b761c14d750dae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a0d29f34218cd60cc6e9ce4dcd13925.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
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2020高三·全国·专题练习
2 . 已知数列{an}中,a1=1,an+1=
,求数列{an}的通项公式.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4e2f69e21fd6254a40f14f707e5d966.png)
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