题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012091411-33636.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012091412-41829.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012091412-97016.png)
(1)求数列
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012091411-33636.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012091412-93459.png)
(2)设
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012091412-79617.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012091411-33636.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012091412-72098.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012091412-57386.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012091413-38923.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012091413-86774.png)
解析
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012091413-36455.png)
因为
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012091413-72355.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012091414-40208.png)
所以
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012091413-38923.png)
(2)由(1)得
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012091414-27095.png)
所以
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012091414-12114.png)
所以
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012091414-37141.png)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012091314-83917.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012091314-81719.png)
(1)求
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012091314-83917.png)
(2)若
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012091315-22610.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012091315-47009.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012091315-37761.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012091301-29871.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012091301-85268.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012091302-50921.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012091302-84739.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012091302-80215.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012091303-92618.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012091303-80728.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012091255-13386.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012091255-84128.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012091255-32080.png)
(1)求数列
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012091255-13386.png)
(2)若数列
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012091255-13386.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012091255-93619.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012091256-71448.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012091255-93619.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012091233-47386.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012091234-85047.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012091234-55149.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012091235-57299.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012091235-23527.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012091235-18770.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012091235-81089.png)
(Ⅰ)求数列
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012091233-47386.png)
(Ⅱ)设数列
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012091236-77545.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012091236-52029.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012091236-66708.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012091236-11223.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012091236-77545.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012091234-55149.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012091234-55149.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012091236-58592.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012091234-55149.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012091227-31718.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012091227-94013.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012091227-31990.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012091227-31718.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012091227-86707.png)
(Ⅰ) 求
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012091227-75037.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012091227-86707.png)
(Ⅱ) 令
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012091227-38004.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012091228-31352.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012091228-64922.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012091228-36631.png)
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