题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012152016-53615.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012152017-61255.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012152017-61255.png)
为 ■
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012152017-77375.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012152017-87619.png)
解析
核心考点
举一反三
已知等差数列
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012151918-49229.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012151918-12208.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012151918-34329.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012151919-40906.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012151908-24598.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012151908-66283.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012151908-81525.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012151909-48522.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012151909-24336.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012151909-74911.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012151910-14912.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012151910-84982.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012151910-27341.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012151910-36719.png)
……
按照以上排列的规律,第
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012151911-93810.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012151911-47836.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012151316-39012.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012151316-64493.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012151316-57787.png)
(Ⅰ)求数列
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012151316-39012.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012151316-64493.png)
(Ⅱ)设
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012151316-95794.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012151317-43840.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012151104-41091.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012151104-92996.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012151104-78696.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012151105-74171.png)
A.![]() | B.8 | C.![]() | D.4 |
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012151016-74863.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012151018-65250.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012151018-67381.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012151018-64547.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012151018-30902.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012151018-48691.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012151019-75255.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012151019-85898.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012151019-94905.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012151018-30902.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012151019-59134.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012151019-59134.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012151019-23932.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012151020-13726.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012151020-34677.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012151020-90474.png)
(1)求数列
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012151018-64547.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012151019-75255.png)
(2)若数列{
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012151020-22357.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012151018-30902.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012151021-15919.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012151021-15919.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012151021-17466.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012151018-30902.png)
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