11-12高二上·江苏·开学考试
1 . 已知数列
,
.
(1)求证:数列
为等比数列;
(2)数列
中,是否存在连续的三项,这三项构成等比数列?试说明理由;
(3)设
,其中
为常数,且
,
,求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/535eeb03a09b3267b92e02c81ea657ae.png)
(1)求证:数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05c4945d58721e7375d1357873cbb5c5.png)
(2)数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
(3)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05d739dff89aedfeca235f7b67c68fdc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b08c58baacec3cd0c0a06e267fa9ec5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84e132f52469b1ec0efbb70b7ff6ac3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fdbfa7a63fdf5717d40c8c9a73ec160.png)
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2 . 已知数列
和
满足:
,
,
,其中
为实数,
为正整数.
(Ⅰ)证明:对任意的实数
,数列
不是等比数列;
(Ⅱ)证明:当
时,数列
是等比数列;
(Ⅲ)设
为数列
的前
项和,是否存在实数
,使得对任意正整数
,都有
?若存在,求
的取值范围;若不存在,说明理由.
![](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/47769ca08edfa79fc200b9f37d197335.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd6a8f0d0c78bacfb7bc0e166d20158b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d65220e3da8e363042fe1468ea600af9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
(Ⅰ)证明:对任意的实数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(Ⅱ)证明:当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1cc3c95b5fb6a85cd4275acb23e8a8c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
(Ⅲ)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f740d370ffa09a06354f981b7fe7881.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
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2016-11-30更新
|
1252次组卷
|
3卷引用:2008年普通高等学校招生考试数学(文)试题(湖北卷)
2008年普通高等学校招生考试数学(文)试题(湖北卷)(已下线)2010-2011学年北京师大附中高一下学期期中考试数学沪教版(上海) 高二第一学期 新高考辅导与训练 第7章 数列与数学归纳法 7.3(4)等比数列的求和公式的应用
2010高一·全国·专题练习
真题
解题方法
3 . 若a是1+2b与1-2b的等比中项,则
的最大值为( )
![](https://img.xkw.com/dksih/QBM/2010/8/14/1569816744484864/1569816749416448/STEM/5e679a3cc3e14641b96343174af3f217.png?resizew=72)
A.![]() | B.![]() | C.![]() | D.![]() |
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