题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012100253-66442.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012100253-89440.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012100253-22668.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012100253-40614.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012100254-66367.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012100254-90088.png)
(Ⅰ)求
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012100254-38286.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012100254-31647.png)
(Ⅱ)设
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012100254-35589.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012100255-19139.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012100255-45251.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012100255-52175.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012100255-49022.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012100255-52684.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012100256-47533.png)
解析
解:(Ⅰ)由已知可得
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012100256-59492.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012100256-77057.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012100256-22233.png)
解得
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012100257-71773.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012100302-23002.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012100302-27355.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012100255-52684.png)
(Ⅱ)由(1)知:
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012100303-70421.png)
∵
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012100255-45251.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012100255-52175.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012100303-64849.png)
整理得:
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012100308-98528.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012100255-52175.png)
即:
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012100309-46045.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012100255-52175.png)
∵
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012100309-17553.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012100309-92220.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012100309-67698.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012100310-14971.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012100310-71410.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012100256-47533.png)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012100242-95526.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012100242-14026.png)
A.30 | B.40 |
C.50 | D.60 |
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012100236-55317.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012100237-75602.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012100237-72269.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012100231-80100.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012100231-50159.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012100231-16835.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012100231-10535.png)
则
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012100232-34786.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012100218-67521.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012100218-50092.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012100219-57560.png)
⑴ 求数列
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012100218-67521.png)
⑵ 令
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012100219-69216.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012100219-47600.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012100219-52374.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012100219-16870.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012100211-71286.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012100211-27012.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012100211-71745.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012100211-95303.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012100212-24770.png)
A.递增等比数列 | B.递增等差数列 |
C.递减数列 | D.以上均不对 |
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