题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010043458-80635.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010043458-93587.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010043458-39510.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010043458-79776.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010043458-80635.png)
(2)设
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010043459-19034.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010043459-47045.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010043458-93587.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010043459-98354.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010043459-76173.png)
解析
试题分析:(1)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010043500-85792.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010043500-24620.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010043500-37117.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010043500-38914.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010043507-60990.png)
两式相减得:
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010043507-98803.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010043507-83862.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010043507-96547.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010043508-67548.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010043508-50339.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010043500-37117.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010043508-91296.png)
(2)由(1)可知:
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010043508-20267.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010043508-71278.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010043509-29288.png)
于是
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010043509-89055.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010043458-39510.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010043509-53796.png)
点评:数列中
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010043509-53796.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010043458-39510.png)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010043340-19358.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010043340-69995.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010043340-32140.png)
(1)求
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010043340-12438.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010043341-85925.png)
(2)设
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010043341-58689.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010043341-74555.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010043312-23839.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010043313-41062.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010043313-70320.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010043313-53778.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010043244-49594.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010043244-30231.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010043244-30231.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010043244-23307.png)
A.12 | B.13 | C.14 | D.15 |
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010043237-70972.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010043237-66125.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010043237-47278.png)
已知
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010043051-29034.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010043051-10746.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010043051-62785.png)
(1)求通项
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010043051-46911.png)
(2)设
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010043052-98583.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010043052-66568.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010043052-75685.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010043052-63262.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010043052-22553.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010043053-57300.png)
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