题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011190748-95709.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011190748-45383.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011190748-77982.png)
A.20 | B.21 | C.22 | D.23 |
答案
解析
试题分析:由题意,得
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011190749-94974.png)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011190457-69836.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011190458-64427.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011190458-58373.png)
(1)求
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011190459-47800.png)
(2)求
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011190459-49688.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011190250-90397.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011190251-23806.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011190251-23806.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011190251-23806.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011190250-90397.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011190208-27884.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011190209-66531.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011190209-27655.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011190209-82286.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011190209-28163.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011190210-25478.png)
且
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011190210-55572.png)
(1)求数列{
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011190208-27884.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011190209-66531.png)
(2)设
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011190210-75124.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011190208-27884.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011190209-66531.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011190209-27655.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011190210-75124.png)
A.1 | B.2 | C.3 | D.4 |
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011190045-28861.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011190045-79568.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011190045-28861.png)
(2)设
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011190045-96340.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011190046-54154.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011190046-50771.png)
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