题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106073915-22804.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106073915-44143.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106073916-92231.gif)
答案
解析
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106073916-92231.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106073916-89733.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106073916-59815.gif)
由
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106073915-22804.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106073916-56064.gif)
所以,以
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106073915-22804.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106073915-44143.gif)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106073907-67243.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106073907-44191.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106073907-80516.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106073908-49164.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106073907-67243.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106073908-49036.jpg)
(1)写出这个三角形数表的第四行、第五行;
(2)求
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106073908-45905.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106073859-18916.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106073859-88270.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106073859-60753.gif)
A.![]() ![]() | B.![]() ![]() |
C.![]() ![]() | D.![]() ![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106073850-42903.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106073850-14128.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106073850-10183.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106073850-41280.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106073850-22054.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106073851-94821.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106073851-59722.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106073851-49809.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106073850-41280.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106073851-75508.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106073846-21911.gif)
A.![]() | B.![]() |
C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106073837-99635.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106073837-99635.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106073837-97778.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106073838-32050.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106073838-79575.gif)
A.若![]() ![]() |
B.若![]() ![]() |
C.若![]() ![]() ![]() |
D.若![]() ![]() ![]() |
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