1 . 已知数列1,
,
,…,
,…,其前n项和为
,则正整数n的值为( ).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60f466b4dda536642c8707527f614bd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/724e7575ee2ce15e8b934729709ad515.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c44fd041a2b109719db7034304235127.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0cf66e4d8a4f885a3fe9c7ac480d554.png)
A.6 | B.8 | C.9 | D.10 |
您最近一年使用:0次
名校
解题方法
2 . 设数列
的前n项和为
,已知
,
,
,
是数列
的前n项和.
(1)求数列
的通项公式;
(2)求满足
的最大正整数n的值.
![](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/f6065aaa8f3f103d1bc960da8318ce35.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/810d08ce985c6351ddcd57777f3894f4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ce13ec00a3bec6db53eecf200cdf589.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a79b3610518518bb81680e5e9712368.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)求满足
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2c6c854be54533ddb980cc5f1f32ce1.png)
您最近一年使用:0次
22-23高一下·全国·期末
解题方法
3 . 在
中,
,点O满足
,
,数列
中,
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79ace47cc6398b1101cf428095e8a378.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/242b14a89363fa1e1a3b74ed989a5311.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e86fdb0f93bc3d14100b5540b6ddab2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44bc66f13763be9aa6a07585bffd8b1f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3f7fda69e2b32b9ced2239f915fa59b.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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