题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009015035-51498.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009015035-23757.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009015036-22848.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009015036-59385.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009015036-67767.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009015036-97523.png)
A.2011 | B.-2012 | C.2014 | D.-2013 |
答案
解析
试题分析:等差数列中,
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009015037-27460.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009015037-69557.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009015035-23757.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009015037-23227.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009015036-67767.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009015037-63317.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009015037-88605.png)
所以,
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009015038-12920.png)
选
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009015038-59810.png)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009015021-37271.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009015021-26758.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009015021-35717.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009015022-14312.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009015022-76389.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009015022-54581.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009015022-40717.png)
(1)求数列
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009015021-37271.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009015022-76389.png)
(2)设
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009015023-24574.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009015023-80672.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009015023-90243.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009015023-97430.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009014949-35011.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009014950-64523.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009014950-19469.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009014950-34447.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009014939-53373.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009014939-41667.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009014940-46504.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009014940-23558.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009014940-96348.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009014940-67347.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009014940-48632.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009014941-58622.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009014941-41005.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009014941-58476.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009014941-17218.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009014942-11161.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009014942-21206.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009014942-78894.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009014942-81496.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009014942-81496.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009014942-11161.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009014942-21206.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009014942-21206.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009014942-81496.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009014942-81496.png)
(1)若各项均为正整数的数列
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009014941-17218.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009014942-78894.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009014942-21206.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009014943-10401.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009014942-81496.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009014942-81496.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009014941-17218.png)
(2)设
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009014941-58476.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009014941-17218.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009014943-99286.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009014943-73028.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009014943-45545.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009014942-78894.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009014941-58622.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009014939-53373.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009014943-38930.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009014940-23558.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009014717-88993.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009014717-20902.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009014718-17221.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009014718-86155.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009014718-28416.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009014718-97920.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009014706-18203.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009014707-17337.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009014707-46417.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009014707-91507.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009014707-32126.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009014708-57700.png)
(1)求数列{an}的通项公式;
(2)求数列{|an|}的前n项和.
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