名校
解题方法
1 . 已知等差数列
中,
,公差
,其前四项中去掉某一项后(按原来的顺序)恰好是等比数列
的前三项,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c98c59cd4749afdd21e73529fc84323.png)
______ ;若对任意的正整数n,
恒成立,则实数λ的取值范围为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b13a6e1d671215fc96e4bee3541d1096.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7535f7f56abb2673cd07049ef4632d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c98c59cd4749afdd21e73529fc84323.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7f6bd49b787ad1032dbfcf6a2044996.png)
您最近一年使用:0次
2023-06-16更新
|
141次组卷
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2卷引用:江苏省扬州市2022-2023学年高二下学期开学考试数学试题
2 . 已知数列
,
,
满足:
,
.
(1)若
是等差数列,且公差
,求数列
的通项公式
;
(2)若
、
均是等差数列,且数列
的公差
,
,求数列
的通项公式.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ef6d44448092ebdb9e4a49d866a749.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0846ab503f3451d5dd0cef4852cc0bd3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44f5556e06ca9c3ea36ed3ad7908994e.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee8a247d65b33fb596e32cff36fbd96a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ef6d44448092ebdb9e4a49d866a749.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c59e7c7a84a4bdb959e95536d0404ceb.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ef6d44448092ebdb9e4a49d866a749.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ef6d44448092ebdb9e4a49d866a749.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9cc0affca4a869b7876243731cfd00e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22a31a2bfcc245c76122d7d8fc0d8012.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
您最近一年使用:0次