题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013010153-21539.gif)
(1)求{an}的通项公式(6分)
(2)等差数列{bn}的中,
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013010153-41947.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013010153-73521.gif)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013010154-44631.gif)
(2)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013010154-50885.gif)
解析
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013010154-69084.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013010154-60253.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013010155-92176.gif)
又
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013010155-25735.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013010155-90796.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013010154-44631.gif)
(2)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013010155-63650.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013010155-87941.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013010156-64558.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013010154-50885.gif)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013010141-78445.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013010141-93985.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013010142-48178.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013010142-36668.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013010142-60700.gif)
A.22 | B.21 | C.20 | D.19 |
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013010131-17497.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013010131-44742.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013010132-40740.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013010132-51112.gif)
A.1 | B.2 | C.3 | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013010126-41178.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013010126-67472.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013010127-51038.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013010127-18938.gif)
(1)“数列
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013010112-12650.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013010112-67293.gif)
(2)“
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013010112-41568.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013010112-94446.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013010112-24710.gif)
(3)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013010112-10008.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013010113-13795.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013010113-57410.gif)
(4)设
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013010113-79139.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013010113-99308.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013010114-67387.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013010114-60171.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013010114-20003.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013010114-92356.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013010115-65480.gif)
其中真命题的序号是 (写出所有真命题的序号)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013010056-36414.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013010057-99915.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013010057-65891.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013010057-94900.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013010057-77397.gif)
(1)求数列
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013010056-36414.gif)
(2)设数列
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013010057-94900.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013010058-37391.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013010058-38919.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013010058-30537.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013010058-63687.gif)
(3)求证:当
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013010058-30537.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013010058-88888.gif)
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