题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010004658-11367.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010004658-23888.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010004658-41719.png)
答案
解析
试题分析:根据题意可知设数列
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010004658-11367.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010004658-23888.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010004658-36124.png)
点评:等差数列的求和问题,主要是对于绝对值的符号的理解和消去,进而转换为和式之间的关系得到,属于基础题。
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010004643-23166.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010004643-69176.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010004644-67555.png)
(Ⅰ)求
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010004643-23166.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010004644-51416.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010004643-23166.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010004634-66705.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010004635-27561.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010004635-43695.png)
(1)求数列
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010004634-66705.png)
(2)若从数列
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010004634-66705.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010004635-11435.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010004635-72430.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010004636-25567.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010004636-12279.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010004636-97506.png)
数列{
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010004619-89492.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010004620-30423.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010004620-81977.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010004620-65794.png)
(1)求数列的通项公式;
(2)设
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010004620-81042.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010004621-68307.png)
在单调递增数列
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010004538-61792.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010004538-21553.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010004539-84565.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010004539-69694.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010004539-64527.png)
(Ⅰ)求
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010004539-72544.png)
(Ⅱ)判断数列
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010004538-61792.png)
(Ⅲ)设
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010004540-84849.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010004540-86718.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010004539-64527.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010004540-43789.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010004352-50465.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010004353-59831.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010004353-33049.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010004353-94830.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010004353-12179.png)
A.15 | B.18 | C.9 | D.12 |
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