题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014074054-33686.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014074054-85805.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014074055-54693.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014074054-33686.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014074055-27735.png)
(1)试求
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014074054-33686.png)
(2)若数列
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014074055-84812.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014074055-19327.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014074055-84812.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014074055-27735.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014074055-18838.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014074056-43694.png)
(2)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014074056-82379.png)
解析
试题分析:解:(1)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014074056-44243.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014074056-64331.png)
②-①得
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014074057-13020.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014074057-75214.png)
又
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014074057-41042.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014074057-48450.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014074057-37656.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014074056-43694.png)
(2)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014074058-75265.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014074058-71618.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014074058-52760.png)
③-④得
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014074058-88842.png)
整理得:
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014074056-82379.png)
点评:主要是考查了等比数列的通项公式和求和的运用,属于基础题。
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014074048-16417.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014074048-48351.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014074038-84447.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014074039-98150.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014074039-79777.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014074039-46444.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014074039-89220.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014074040-72739.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014074040-10976.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014074022-38853.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014074022-99251.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014074022-63585.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014074023-16080.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014074023-87250.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014074023-11061.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014074023-26931.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014074023-74263.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014074024-20693.png)
(Ⅰ)求
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014074024-51155.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014074023-74263.png)
(Ⅱ)若对任意的
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014074024-93342.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014074024-72433.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014074024-64524.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014074012-38719.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014074012-49201.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014074012-42893.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014074012-27895.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014074004-24159.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014074004-48372.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014074005-25936.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014074005-89474.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014074005-40731.png)
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