题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009005429-91391.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009005429-20071.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009005429-59963.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009005429-56087.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009005430-59924.png)
解析
试题分析:由9x,12y,15z成等比数列,可得
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009005430-34538.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009005430-43678.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009005429-91391.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009005429-20071.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009005429-59963.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009005430-63449.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009005431-31445.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009005431-98714.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009005431-85219.png)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009005313-52766.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009005313-20491.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009005314-44196.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009005314-97360.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009005314-17673.png)
(1)当
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009005314-67202.png)
(2)当
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009005315-85232.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009005306-79422.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009005307-43631.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009005258-28123.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009005258-69974.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009005258-97085.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009005258-88173.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009005258-39909.png)
A.![]() | B.![]() | C.![]() | D.![]() |
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009005141-52886.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009005141-12786.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009005141-18433.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009005141-46919.png)
(1)求数列
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009005141-52886.png)
(2)数列
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009005141-52886.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009005141-33759.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009005142-77028.png)
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