题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014070225-29517.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014070225-12667.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014070225-16060.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014070225-20299.png)
答案
解析
试题分析:利用等比数列前
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014070226-38755.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014070226-39423.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014070226-29364.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014070226-90400.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014070226-79028.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014070227-58187.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014070227-86899.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014070227-19444.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014070227-45875.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014070228-46437.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014070226-38755.png)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014070212-83506.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014070212-33912.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014070212-47977.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014070212-87374.png)
(1)求数列
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014070212-83506.png)
(2)设
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014070213-18959.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014070213-43855.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014070212-33912.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014070201-64314.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014070202-73892.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014070202-67546.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014070143-51555.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014070144-59368.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014070144-46355.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014070144-40394.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014070144-89981.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014070144-51701.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014070127-51941.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014070127-17867.png)
(1)求数列
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014070127-51941.png)
(2)在
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014070128-62911.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014070128-41893.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014070128-99728.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014070128-62911.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014070128-41893.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014070128-55077.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014070128-66429.png)
①设
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014070129-81053.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014070129-50580.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014070129-65791.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014070129-47012.png)
②在数列
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014070130-71312.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014070130-33680.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014070130-40637.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014070120-49509.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014070120-58292.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014070120-11055.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014070121-52017.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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