题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012102900-60893.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012102900-65403.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012102900-71768.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012102901-41176.png)
答案
解析
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012102901-18754.png)
两式作差得到递推关系式,然后利用数列的定义得到其通项公式,可知
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012102900-71768.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012102901-41176.png)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012102850-90979.png)
A.12 | B.10 | C.24 | D.6 |
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012102823-12223.jpg)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012102803-32694.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012102804-43037.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012102804-99828.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012102804-47089.png)
(Ⅰ)若
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012102804-21160.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012102804-37123.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012102804-72340.png)
(Ⅱ)若
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012102805-75070.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012102805-24743.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012102805-93530.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012102805-78955.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012102805-11063.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012102805-45427.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012102805-24743.png)
(Ⅲ)若
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012102805-80328.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012102805-40781.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012102804-99828.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012102806-22011.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012102803-32694.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012102730-19678.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012102730-59452.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012102730-78172.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012102731-41864.png)
(1)求数列
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012102730-19678.png)
(2)设
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012102731-55870.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012102731-53683.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012102730-59452.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012102731-85204.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012102731-79116.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012102732-32559.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012102731-79116.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012102710-70537.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012102710-48961.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012102710-76374.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012102710-33867.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012102710-48961.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012102711-51221.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012102711-96940.png)
(1)求
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012102711-91209.png)
(2)若数列
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012102711-25382.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012102712-12589.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012102711-25382.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012102710-48961.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012102712-85932.png)
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