题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015030410-89437.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015030410-42305.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015030411-96973.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015030411-77133.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015030411-27710.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015030410-89437.png)
(1)求
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015030411-33984.png)
(2)设数列
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015030411-47057.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015030412-77239.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015030411-77133.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015030411-47057.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015030412-15730.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015030412-29513.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015030412-59304.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015030413-89703.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015030413-42883.png)
解析
试题分析:(1)由等差数列
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015030413-69366.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015030410-42305.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015030411-96973.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015030413-40842.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015030413-79657.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015030414-32656.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015030412-59304.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015030413-89703.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015030412-77239.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015030414-87815.png)
当
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015030414-57925.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015030414-58882.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015030415-15932.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015030415-56690.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015030415-60259.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015030414-32656.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015030415-64655.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015030415-24324.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015030416-14450.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015030413-42883.png)
试题解析:(1)设
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015030410-89437.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015030416-73746.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015030411-96973.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015030416-54730.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015030412-59304.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015030413-89703.png)
(2)由
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015030412-77239.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015030416-51694.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015030414-87815.png)
当
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015030414-57925.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015030416-64014.png)
当
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015030415-15932.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015030417-46897.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015030415-60259.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015030411-77133.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015030415-64655.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015030415-24324.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015030416-14450.png)
即
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015030413-42883.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015030414-32656.png)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015030355-18006.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015030355-45161.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015030356-67195.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015030356-88552.png)
(1)求数列
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015030356-98428.png)
(2)若从数列
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015030356-50066.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015030357-25344.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015030357-12517.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015030357-16147.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015030343-92119.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015030343-48646.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015030344-27508.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015030344-47709.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015030331-71989.png)
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