题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011212316-46455.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011212316-46455.png)
A.4 | B.9 | C.16 | D.25 |
答案
解析
试题分析:∵
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011212317-32636.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011212317-77462.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011212317-45009.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011212317-14184.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011212318-77779.png)
核心考点
试题【设等比数列{},Sn是数列{}的前n项和,S3=14,且al+8,3a2,a3+6依次成等差数列,则al·a3等于( )A.4B.9C.16D.25】;主要考察你对等差数列等知识点的理解。[详细]
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011212154-41407.png)
(1)求数列
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011212154-41407.png)
(2)设
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011212154-57151.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011212155-19396.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011212155-29957.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011212155-86970.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011212037-54061.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011212037-40588.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011212038-29028.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011212016-78595.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011212016-68649.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011212017-27520.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011212017-20651.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011212017-60191.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011212017-95044.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011212018-15542.png)
(1)求
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011212017-20651.png)
(2)求
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011212016-78595.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011211601-69010.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011211601-97617.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011211602-80501.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011211602-52909.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011211602-51157.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011211602-55579.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011211603-41078.png)
(1)求数列
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011211601-69010.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011211602-51157.png)
(2)设
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011211603-53624.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011211603-34246.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011211604-93753.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011211604-87122.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011211542-21165.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011211543-75719.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011211543-29757.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011211548-33856.png)
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