题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010215522-11669.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010215523-69838.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010215523-94986.png)
①求
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010215522-11669.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010215523-29780.png)
②若bn=
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010215523-74042.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010215523-60802.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010215524-68568.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010215534-38212.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010215535-71726.png)
∴an=13-2n………………………………………………………………………………………6分
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010215535-49643.png)
解析
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010215036-12349.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010215036-61591.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010215037-16276.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010215037-85758.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010215036-12349.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010215020-81381.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010215020-76499.png)
(Ⅰ)求
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010215020-71646.png)
(Ⅱ)设
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010215021-95717.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010215021-32013.png)
(Ⅲ)设
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010215021-20538.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010215021-31985.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010215022-64216.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010214833-56128.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010214833-35477.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010214834-89442.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010214834-63463.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010214834-57156.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010214834-43003.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010214834-89735.png)
(Ⅰ) 求数列
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010214833-56128.png)
(Ⅱ) 若
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010214835-38823.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010214835-85127.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010214835-37747.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010214833-35477.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010214835-93314.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010214801-64508.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010214802-94103.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010214802-62451.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010214803-35069.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010214803-88339.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010214803-46919.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010214803-56367.png)
A.24 | B.48 | C.60 | D.84 |
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010214608-54538.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010214608-19541.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010214608-92258.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010214609-27049.png)
(1)求数列
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010214609-79770.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010214609-59466.png)
(2)求
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010214609-49373.png)
(3) 比较
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010214609-49373.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010214610-54880.png)
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