题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014045721-59431.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014045721-26150.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014045722-25388.png)
答案
解析
试题分析:由等比数列的性质,得
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014045722-73694.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014045722-33162.png)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014045705-11438.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014045705-43156.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014045706-27437.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014045705-11438.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014045658-80579.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014045659-25999.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014045659-44171.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014045659-25999.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014045659-62776.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014045659-40841.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014045700-38776.png)
|
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014045649-40375.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014045649-51269.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014045649-58733.png)
A.5 | B.10 | C.15 | D.20 |
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014045640-54215.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014045640-10522.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014045640-75510.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014045640-85030.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014045641-23612.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014045641-19368.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014045641-73879.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014045641-14289.png)
(1)设数列
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014045641-67484.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014045642-35831.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014045642-35567.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014045642-41865.png)
(2)设
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014045640-54215.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014045642-48371.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014045643-29313.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014045642-35831.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014045642-35567.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014045643-42703.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014045632-26905.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014045632-47280.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014045632-73935.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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