题目
题型:不详难度:来源:
(本小题满分12分)已知数列
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013011251-32293.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013011252-58336.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013011252-77186.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013011252-19202.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013011252-47727.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013011252-31033.gif)
(1)求
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013011253-72823.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013011253-59729.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013011253-45466.gif)
(2)求数列
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013011251-32293.gif)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013011253-31601.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013011254-31543.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013011254-27072.gif)
(2)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013011254-41897.gif)
解析
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013011254-80072.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013011252-47727.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013011253-31601.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013011254-31543.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013011254-27072.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013011255-69732.gif)
(2)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013011254-80072.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013011252-47727.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013011255-55957.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013011255-49561.gif)
两式相减得:
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013011255-63646.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013011255-55957.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013011255-21095.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013011255-55957.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013011251-32293.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013011256-29642.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013011256-35756.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013011251-32293.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013011254-41897.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013011255-69732.gif)
核心考点
举一反三
(本小题满分14分)等差数列
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013011237-76370.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013011237-90491.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013011237-76370.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013011237-76198.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013011237-41716.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013011238-42504.gif)
(1)求数列
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013011237-76370.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013011238-70044.gif)
(2)设
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013011238-34156.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013011238-97089.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013011239-14213.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013011239-81663.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013011239-23861.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013011227-98859.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013011227-69901.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013011228-94448.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013011228-58803.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013011227-98859.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013011228-47630.gif)
A.0 | B.![]() | C.![]() | D.2 |
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013011222-18909.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013011222-97281.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013011223-23996.gif)
A.—1 | B.![]() | C.![]() | D.1 |
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013011216-61555.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013011216-20133.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013011216-30677.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013011216-95373.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013011216-30677.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013011217-99635.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013011217-14751.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013011209-51085.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013011209-78064.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013011209-57812.gif)
(1)求数列
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013011209-51085.gif)
(2)若
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013011209-18508.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013011210-51480.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013011210-31689.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013011210-64530.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013011210-22293.gif)
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