题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015033607-55383.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015033607-50374.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015033607-64817.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015033607-97315.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015033608-24178.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015033608-37159.png)
解析
试题分析:由题意知
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015033608-19523.png)
所以
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015033608-74395.png)
下式减上式得
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015033608-81930.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015033609-86069.png)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015033546-13740.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015033546-36831.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015033546-67638.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015033546-20998.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015033546-46394.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015033547-97031.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015033546-36831.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015033547-90221.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015033547-68370.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015033547-52432.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015033547-90221.png)
(1)求数列
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015033546-13740.png)
(2)求数列
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015033546-36831.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015033547-90221.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015033547-97031.png)
(3)求证:
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015033547-84150.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015033531-64854.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015033531-66999.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015033531-30212.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015033531-70350.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015033531-50493.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015033532-49348.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015033532-49080.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015033532-84895.png)
(1)求数列
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015033531-64854.png)
(2)求证:数列
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015033532-65508.png)
(3)若
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015033533-42393.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015033533-13285.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015033533-43378.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015033518-14115.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015033518-35979.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015033518-40087.png)
A.13 | B.-76 | C.46 | D.76 |
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015033507-89012.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015033507-66770.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015033508-66633.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015033508-79221.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015033508-29306.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015033508-58712.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015033508-64501.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015033508-29306.png)
(1)求
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015033509-82935.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015033509-14005.png)
(2)求数列
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015033509-91307.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015033507-66770.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015033509-41307.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015033456-68206.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015033456-87133.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015033456-52390.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015033456-37739.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015033456-37739.png)
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