题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009113653-35179.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009113653-93033.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009113653-30252.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009113653-64618.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009113653-35179.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009113654-99550.png)
答案
解析
试题分析:从两个方面来证明此题:若数列
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009113653-35179.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009113653-93033.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009113653-30252.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009113653-93033.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009113654-81809.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009113654-99550.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009113653-35179.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009113653-93033.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009113653-64618.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009113654-99550.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009113653-93033.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009113653-30252.png)
试题解析:证:若数列
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009113653-35179.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009113653-93033.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009113654-54185.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009113653-30252.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009113653-93033.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009113654-81809.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009113653-35179.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009113653-93033.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009113653-64618.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009113654-99550.png)
反过来,当数列
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009113653-35179.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009113653-93033.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009113653-64618.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009113654-99550.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009113655-81095.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009113655-18716.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009113655-96568.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009113655-75120.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009113655-37206.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009113656-21468.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009113656-41720.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009113653-35179.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009113656-41720.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009113656-45211.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009113653-35179.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009113656-22688.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009113657-47738.png)
综上所述,数列
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009113653-35179.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009113654-99550.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009113653-93033.png)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009113620-33385.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009113620-49122.png)
A.-90 | B.-27 | C.-25 | D.0 |
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009113602-10406.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009113524-77276.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009113524-49102.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009113524-61953.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009113525-91420.png)
(Ⅰ)求数列
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009113524-77276.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009113525-12901.png)
(Ⅱ)设
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009113525-98807.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009113525-60985.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009113526-42372.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009113448-24169.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009113449-83205.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009113449-64672.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009113450-89280.png)
(1)求数列
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009113448-24169.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009113450-58662.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009113450-62503.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009113450-54464.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009113451-86872.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009113312-29510.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009113312-56775.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009113312-26705.png)
A.20 | B.21 | C.22 | D.23 |
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