题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015040655-85370.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015040655-73772.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015040655-98179.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015040655-22479.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015040655-59935.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015040656-28240.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015040656-89735.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015040656-35694.png)
解析
试题分析:根据题意,由于
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015040656-23151.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015040657-59803.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015040656-28240.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015040657-73208.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015040657-73742.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015040656-89735.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015040657-68992.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015040656-35694.png)
点评:主要是考查了数列的递推关系的运用,属于中档题。
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015040644-60352.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015040644-81170.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015040644-55260.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015040644-78123.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015040645-25021.png)
(1)试判断数列
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015040645-71561.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015040644-60352.png)
(2)记
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015040645-98049.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015040645-71561.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015040644-55260.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015040645-24464.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015040637-34186.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015040637-65513.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015040638-97518.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015040638-37047.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015040637-65513.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015040638-89712.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015040638-37047.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015040624-99533.png)
A.4 | B.11 | C.10 | D.8 |
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015040617-88086.png)
(1)求通项公式an ;(2)令
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015040618-48446.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015040610-80472.png)
(1)第
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015040610-27702.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015040610-27702.png)
(2)表中的递推关系类似杨辉三角,则第
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015040610-27702.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015040611-76458.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015040611-57191.png)
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