题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009222930-83932.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009222930-90884.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009222930-33245.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009222931-57857.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009222931-70845.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009222931-82777.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009222931-54976.png)
(1)求
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009222932-74737.png)
(2)求数列
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009222931-57857.png)
(3)求证
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009222932-31218.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009222932-15417.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009222932-92795.png)
(3)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009222933-48698.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009222933-75464.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009222933-79213.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009222933-84624.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009222934-41410.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009222934-57166.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009222932-31218.png)
解析
试题分析:⑴
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009222934-95588.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009222930-90884.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009222930-33245.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009222933-75464.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009222934-31468.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009222934-17808.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009222935-63733.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009222932-15417.png)
⑵由⑴知
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009222935-31761.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009222933-75464.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009222935-87175.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009222933-75464.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009222935-76912.png)
又
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009222931-70845.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009222933-75464.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009222936-11767.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009222936-49651.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009222933-75464.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009222936-88197.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009222931-57857.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009222932-92795.png)
⑶由⑵知
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009222932-92795.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009222933-75464.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009222936-35375.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009222936-12024.png)
又
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009222937-68834.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009222933-75464.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009222937-25639.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009222937-85956.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009222934-41410.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009222934-57166.png)
综上有
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009222932-31218.png)
点评:本题第二问是由数列递推公式
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009222937-59718.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009222938-48885.png)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009222919-51980.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009222919-99585.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009222901-11440.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009222902-84773.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009222819-71621.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009222820-75589.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009222820-98711.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009222820-43153.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009222820-28489.png)
A.5 | B.10 | C.15 | D.20 |
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009222752-41105.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009222752-57622.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009222752-16116.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009222752-20630.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009222752-93451.png)
(1)数列
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009222752-41105.png)
(2)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009222753-34747.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009222618-38806.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009222618-48392.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009222618-17602.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009222618-93832.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009222619-93297.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009222619-26702.png)
(1)求
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009222619-68756.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009222619-29365.png)
(2)记数列
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009222620-58660.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009222620-36913.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009222620-29203.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009222621-81147.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009222621-28351.png)
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