题目
题型:不详难度:来源:
![](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)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012091315-71303.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012091315-71134.png)
解析
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012091316-34313.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012091316-49635.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012091316-92645.png)
则由
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012091316-26538.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012091317-35299.png)
解得
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012091317-57592.png)
所以
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012091316-34313.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012091315-71303.png)
(2)由
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012091317-30139.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012091317-66464.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012091317-96627.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012091318-13794.png)
核心考点
举一反三
![](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)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012091212-42233.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012091212-15423.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012091212-59461.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012091212-26822.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012091213-78063.png)
(1)求数列
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012091212-42233.png)
(2)在
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012091213-99004.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012091213-67511.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012091213-96304.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012091213-33027.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012091212-15423.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012091214-42054.png)
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