题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012123253-81550.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012123253-33793.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012123253-52375.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012123253-16593.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012123254-80091.png)
(1)求数列
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012123253-81550.png)
(2)等差数列
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012123254-32081.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012123253-33793.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012123254-54088.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012123254-92222.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012123255-90884.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012123254-54088.png)
(3)数列
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012123255-79192.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012123253-33793.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012123255-40773.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012123255-40773.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012123255-42834.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012123256-59221.png)
(3)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012123256-76293.png)
解析
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012123254-80091.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012123256-23474.png)
所以
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012123256-25129.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012123255-42834.png)
(2)设等差数列
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012123257-39664.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012123257-41433.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012123257-49085.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012123257-80042.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012123257-95700.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012123256-59221.png)
(3)因为
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012123258-60857.png)
所以
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012123256-76293.png)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012123227-94923.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012123228-65697.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012123227-94923.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012123228-83828.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012123229-36422.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012123229-83594.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012123229-61563.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012123230-80121.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012123230-25602.png)
(Ⅰ)求数列
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012123227-94923.png)
(Ⅱ)求数列
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012123230-60456.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012123228-83828.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012123230-58897.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012123156-48545.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012123157-17487.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012123157-10165.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012123150-50342.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012123132-72414.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012123133-35380.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012123133-65866.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012123133-66879.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012123133-74650.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012123117-42753.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012123117-63905.png)
①
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012123118-34161.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012123118-42228.png)
③
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012123118-48610.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012123119-87756.png)
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