题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010011514-64077.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010011514-90420.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010011514-43669.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010011515-57375.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010011514-64077.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010011515-42253.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010011515-38159.png)
答案
解析
试题分析:因为
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010011514-64077.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010011514-90420.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010011514-43669.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010011515-21018.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010011516-75863.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010011516-69797.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010011516-85633.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010011516-59492.png)
点评:小综合题,利用题中给定条件,可首先求出
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010011517-46630.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010011515-38159.png)
核心考点
举一反三
已知数列
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010011245-48546.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010011245-88157.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010011246-96236.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010011246-17882.png)
(1)求证:数列
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010011246-26912.png)
(2)若数列
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010011246-29752.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010011247-76193.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010011247-62062.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010011247-86468.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010011245-88157.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010011247-21912.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010011205-84380.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010011205-65734.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010011206-51661.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010011206-44135.png)
已知等差数列
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010011000-15671.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010011000-44907.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010011000-15671.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010011001-98605.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010011001-14350.png)
(Ⅰ)求
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010011001-11949.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010011001-14350.png)
(Ⅱ)令
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010011001-47501.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010011002-41222.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010011001-98605.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010011002-85417.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010011002-66188.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010010939-47568.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010010940-30844.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010010941-82155.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010010941-70004.png)
A.![]() | B.![]() | C.-5 | D.5 |
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010010615-20322.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010010615-64989.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010010615-27342.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010010615-62463.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010010615-27556.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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