题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010023754-59937.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010023754-27921.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010023754-59792.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010023755-26503.png)
答案
解析
试题分析:因为
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010023754-59792.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010023755-51831.png)
当
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010023755-78597.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010023756-42229.png)
数列{
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010023754-59937.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010023755-26503.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010023756-69575.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010023756-29384.png)
点评:简单题,等差数列是高考必考内容,特别是等差数列的性质,散见在例题、练习题中,应注意总结汇总。
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010023726-34991.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010023726-86503.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010023727-36369.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010023727-10489.png)
(Ⅰ) 求数列
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010023726-34991.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010023727-18253.png)
(Ⅱ)若
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010023727-86994.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010023728-20327.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010023728-89179.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010023609-69291.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010023609-62112.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010023610-33486.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010023610-51864.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010023539-66013.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010023539-87840.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010023539-33147.png)
(Ⅰ)求数列
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010023539-66013.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010023540-70188.png)
(Ⅱ)若
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010023540-23112.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010023540-58330.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010023540-57711.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010023541-17770.png)
(Ⅲ)若
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010023541-13489.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010023541-76759.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010023412-35575.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010023412-66085.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010023412-23022.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010023412-25321.png)
设数列
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010023328-25078.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010023328-43813.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010023328-94067.png)
(Ⅰ)求数列
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010023328-25078.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010023329-30959.png)
(Ⅱ)若
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010023329-75419.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010023329-15704.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010023329-57208.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010023330-35266.png)
(Ⅲ)若
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010023330-72602.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010023330-64952.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010023329-57208.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010023330-93068.png)
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