题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012003236-22779.png)
则第
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012003237-59440.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012003237-75540.png)
解析
试题分析:观察图中白色地面砖的个数分别是6,10,14,…不难发现此数列是以首项为
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012003237-28964.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012003237-16635.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012003237-57497.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012003238-73915.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012003238-70157.png)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012003223-45500.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012003224-60083.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012003224-35237.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012003158-80288.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012003158-38130.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012003158-80288.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012003158-15061.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012003158-46151.png)
(Ⅰ)求
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012003209-50744.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012003158-46151.png)
(Ⅱ)令
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012003210-54234.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012003210-69407.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012003158-15061.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012003210-28285.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012003153-71451.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012003153-60243.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012003153-37510.png)
A.1 | B.2 | C.![]() | D.4 |
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012003130-23178.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012003130-48328.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012003131-42358.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012003131-66090.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012003131-98199.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012003131-37948.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012003131-42358.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012003132-20980.png)
(1)求数列
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012003130-48328.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012003131-37948.png)
(2)求数列
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012003132-30210.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012003131-42358.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012003132-68247.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012003119-81904.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012003119-77042.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012003119-47799.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012003119-81904.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012003119-67143.png)
A.7 | B.15 | C.20 | D.25 |
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