题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012073232-67356.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012073233-53417.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012073233-33843.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012073232-67356.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012073233-28067.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012073233-40686.png)
解析
试题分析:因为
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012073233-33843.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012073234-87472.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012073234-46362.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012073234-83101.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012073233-28067.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012073233-40686.png)
点评:本题通过配凑系数构造新数列,使新数列为等比数列。通过求新数列的通项公式,总而求出要求的数列的通项公式。若已知
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012073234-12216.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012073234-58398.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012073235-54141.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012073235-13534.png)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012073216-10010.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012073216-16824.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012073216-10010.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012073216-68899.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012073216-31228.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012073137-48113.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012073137-40267.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012073137-49304.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012073137-17397.png)
(Ⅰ)证明数列
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012073138-20408.png)
(II)求数列
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012073137-48113.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012073138-21391.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012073138-26405.png)
(Ⅲ)证明对任意
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012073137-17397.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012073138-97950.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012073127-96387.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012073127-25262.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012073127-96387.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012073128-24232.png)
A.14 | B.21 | C.28 | D.35 |
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012073111-88381.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012073111-49329.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012073111-74110.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012073112-87804.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012073112-34256.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012073112-21959.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012073112-60570.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012073111-88381.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012073111-88381.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012073112-50329.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012073113-61026.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012073113-65128.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012073113-45622.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012073111-49329.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012073113-65128.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012073041-69686.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012073042-93970.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012073042-89712.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012073042-28993.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012073042-54633.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012073042-55914.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012073042-55914.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012073043-60511.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012073042-93970.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012073043-30874.png)
设
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012073043-67558.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012073043-62726.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012073044-93296.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012073044-20586.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012073044-49219.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012073044-81660.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012073045-52172.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012073045-54488.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012073045-63137.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012073045-63137.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012073045-77098.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012073045-40185.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012073045-88927.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012073046-78265.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012073046-53349.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012073045-54488.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012073046-82161.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012073046-24507.png)
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