题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015040306-66779.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015040306-22083.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015040306-51029.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015040307-77660.png)
(1)求
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015040307-36738.png)
(2)求知数列
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015040306-66779.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015040307-53855.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015040307-83149.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015040308-26034.png)
解析
试题分析:(1)由
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015040308-34471.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015040308-74458.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015040308-27770.png)
即
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015040308-43850.png)
当
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015040309-26301.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015040309-29925.png)
所以
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015040309-99443.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015040308-26034.png)
点评:由数列前n项和
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015040309-40716.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015040309-36834.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015040310-35081.png)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015040255-81610.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015040255-15704.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015040255-40257.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015040256-10913.png)
(1)求等比数列
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015040256-10913.png)
(2)若
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015040256-84776.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015040255-15704.png)
(3)设
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015040256-60719.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015040256-13643.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015040256-25684.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015040255-40257.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015040256-97372.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015040257-98640.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015040257-61717.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015040249-57630.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015040250-79998.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015040250-15829.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015040250-29165.png)
A.20 | B.19 | C.18 | D.17 |
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015040241-93267.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015040241-14373.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015040241-27576.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015040241-93267.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015040241-23791.png)
(1)求
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015040241-26443.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015040241-23791.png)
(2)令
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015040242-73264.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015040242-39285.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015040242-25944.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015040242-10166.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015040243-28242.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015040243-18253.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015040216-19700.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015040216-21797.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015040216-68439.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015040216-15674.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015040217-70781.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015040217-13811.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015040205-30913.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015040205-24052.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015040205-40091.png)
(1)求数列
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015040205-24052.png)
(2)将数列
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015040205-24052.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015040205-24052.png)
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