题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014053925-44014.png)
A.23 | B.21 | C.19 | D.17 |
答案
解析
试题分析:法一:设公比为
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014053925-47480.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014053925-35126.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014053925-98413.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014053926-27476.png)
法二:依题意可知
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014053926-51008.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014053926-83693.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014053926-33373.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014053927-28943.png)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014053917-13112.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014053917-28562.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014053917-66685.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014053918-27749.png)
(1)求证:数列
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014053918-12872.png)
(2)求数列
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014053918-33970.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014053852-63183.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014053852-83118.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014053852-29310.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014053852-23562.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014053852-76713.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014053853-30657.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014053846-16180.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014053847-23959.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014053847-52568.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014053847-61175.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014053840-31546.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014053840-89047.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014053840-86824.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014053840-63223.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014053841-26321.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014053841-31573.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014053841-28086.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014053841-81733.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014053841-55486.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014053842-80429.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014053822-85900.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014053822-50733.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014053823-65985.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014053823-84241.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014053823-74599.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014053823-79154.png)
(1)求证:数列
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014053823-70346.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014053824-38304.png)
(2)设数列
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014053824-27631.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014053824-23674.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014053824-76762.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014053825-82798.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014053825-11409.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014053825-23509.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014053825-94390.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014053825-67184.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014053826-25278.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014053826-35806.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014053825-11409.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014053826-90210.png)
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