题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009151321-54119.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009151321-15154.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009151321-28109.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009151321-28109.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009151321-95163.png)
答案
解析
试题分析:由前n项和
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009151321-28109.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009151321-30081.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009151321-44052.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009151322-75049.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009151322-75472.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009151322-72886.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009151321-28109.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009151322-38188.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009151322-49332.png)
核心考点
举一反三
(1)求an的通项an;
(2)求an的前n项和Sn的最大值并求出此时n值.
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009151050-93072.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009151050-26475.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009151050-60183.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009151050-21263.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009151051-74959.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009151051-95957.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009151051-63910.png)
(1)求
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009151050-93072.png)
(2)求证:数列
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009151051-41222.png)
(3)求
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009151050-21263.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009151024-88910.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009151025-58009.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009151025-51564.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009151025-57076.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009151025-92866.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009151026-98651.png)
(1)求证:数列
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009151024-88910.png)
(2)若
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009151026-23223.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009151026-41055.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009151026-35722.png)
(3)在(2)的条件下,若
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009151027-17981.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009151027-85237.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009151025-58009.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009151027-63229.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009150059-76947.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009150059-69309.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009150100-87083.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009150100-37921.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009150100-44715.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009150100-30848.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009150100-49546.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
A.3 | B.4 | C.5 | D.6 |
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