题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014074614-29954.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014074614-47397.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014074614-47393.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014074615-41387.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014074615-89253.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014074615-95016.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014074615-47371.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014074615-13173.png)
A.35 | B.33 | C.31 | D.29 |
答案
解析
试题分析:用a1和q表示出a2和a3代入
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014074615-41387.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014074615-47371.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014074616-39338.png)
点评:本题主要考查了等比数列的性质.属基础题
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014074607-85987.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014074607-40335.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014074607-56643.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014074607-14890.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014074607-56643.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014074607-56643.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014074607-82515.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014074607-33118.png)
(1)求证:数列
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014074607-80210.png)
(2)求数列
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014074607-85987.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014074555-45767.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014074555-26185.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014074556-46951.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014074556-88607.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014074556-13958.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014074556-53986.png)
(Ⅰ)求
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014074556-69161.png)
(Ⅱ)记
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014074556-27434.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014074556-31628.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014074557-32624.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014074557-78396.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014074550-90766.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014074551-66743.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014074547-22180.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014074547-23098.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014074538-30256.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014074538-39131.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014074538-17938.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014074538-97470.png)
A.![]() | B.![]() |
C.![]() | D.![]() ![]() |
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