解题方法
1 . 已知数列
,
均为各项都不相等的数列,
为
的前n项和,
.
若
,求
的值;
若
是公比为
的等比数列,求证:数列
为等比数列;
若
的各项都不为零,
是公差为d的等差数列,求证:
,
,
,
,
成等差数列的充要条件是
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe229b24e2d56ff6b491725ceae4ff2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bee4464b3b4eb6e52ee02f095aae84f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b708c8dcb2d66eb2ce0b3718a9cd924a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe229b24e2d56ff6b491725ceae4ff2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98c07062305c336ffa4f184e1b66600f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4141b26d2c32655003494a91ad6331b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e151e19b4fa1ce9855129325e5dd80c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d199f9235e3bd36bfa78c3772e941896.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65863c1abad833b79c303bfca24f535c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe229b24e2d56ff6b491725ceae4ff2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0575508fcd0f7974232dfb5534c3251e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/398d80157dbee63efc70a0f1ba28812e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4bb89a362c1faf4d0c306eabbb59710.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe229b24e2d56ff6b491725ceae4ff2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bee4464b3b4eb6e52ee02f095aae84f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cb5ca241bb7c313ef0366d3ddba93bc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cbeed5324c432101be517dd6f5c735b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07096af3b99fd1cb11c31f19a2c6408e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0bfccafa83afe5ee21eab6ef2b2c8852.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07096af3b99fd1cb11c31f19a2c6408e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/243d2ecafcdf5de8f295785df39aee91.png)
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3卷引用:2020届湖南省长沙市明达中学高三(高复部)第二次模拟考试理科数学试题
名校
解题方法
2 . 若数列
满足:存在正整数T,对于任意正整数n都有
成立,则称数列
为周期数列,周期为T.已知数列
满足
,
,则下列结论中错误的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/919a1118a34cb89239865c4bce6f4d60.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a101bcce7f08d17ec550ecceef4ff9a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdc38279cf170360bb314091f8bb293c.png)
A.若![]() |
B.若![]() ![]() |
C.对于任意的![]() ![]() ![]() ![]() |
D.存在![]() ![]() ![]() |
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5卷引用:2015届湖南省长望浏宁四县高三3月调研(一模)考试理科数学试卷
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3 . 如图所示,已知
,对任何
,点
按照如下方式生成:
,且
按逆时针排列,记点
的坐标为
,则
为
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/31/ff38957d-45ad-440d-b2fb-d08361bc3047.png?resizew=276)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54dfbc420f80712e67ded7f1501abee8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8172796a9473b3c17ef6429961203796.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29789b0b8a676f5dffcdb979e381117a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a7ed18b785f6c8068dfe8c4dd0d717.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e6e963dcffaf1181c5f1f4639057db4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aadd51d72723320ae712a8a7622551cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fef0bf7b5edd8955fce0742b840ea606.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5be80fc463c98d466eb360c134ee16a3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/31/ff38957d-45ad-440d-b2fb-d08361bc3047.png?resizew=276)
A.![]() | B.![]() | C.![]() | D.![]() |
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