2011·湖北·一模
1 . 已知数列
满足:
,已知存在常数
使数列
为等比数列.
(1)求常数
及
的通项公式;
(2)解方程![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de01e0ca0018abba2aec23cc20464a62.png)
(3)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a3c61223aeb2841f2cef0e9168e42b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0cd5371a6f0f82c65dd22f75f8b807c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a296a9dc44a92a470f4026827a1a9d.png)
(1)求常数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0cd5371a6f0f82c65dd22f75f8b807c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)解方程
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de01e0ca0018abba2aec23cc20464a62.png)
(3)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d456c6fa7282e4126b10a47ec0afb6de.png)
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2 . 过曲线
上的一点
作曲线的切线,交x轴于点P1,过P1作垂直于x轴的直线交曲线于Q1,过Q1作曲线的切线,交x轴于点P2;过P2作垂直于x轴的直线交曲线于Q2,过Q2作曲线的切线,交x轴于点P3;……如此继续下去得到点列:
设
的横坐标为![](https://staticzujuan.xkw.com/quesimg/Upload/formula/162c9e7170296f7bd4241dc11251ed5b.png)
(I)试用n表示
;
(II)证明:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c007102636df74283fcacd042dfb9d9.png)
(III)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4786ff384829d0ba235c689dfa494e3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c50b3a5cb99d3faf06ceed2ef3880c2d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f087469e06e5a5d26eaa8fce7310e569.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf83e20035c3afd6d26ebfd53d768a70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/162c9e7170296f7bd4241dc11251ed5b.png)
(I)试用n表示
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3282e5fde4ae53fcb1bb072a685304c9.png)
(II)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c007102636df74283fcacd042dfb9d9.png)
(III)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/530e4880bf63322822d3cad9e8e50dbe.png)
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