题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020105012-74412.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020105012-16798.png)
A.240 | B.120 | C.60 | D.15 |
答案
解析
解答:解:∵(2x-1)6展开式的通项是C6r(2x)r
∴要求x2的系数,只要使得r=2即可,
∴x2的系数是C62×22=60
故选C.
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020105006-87872.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020105006-61112.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020105006-81459.png)
三个不同的展馆服务,每个展馆至少分配一人.若甲要求不到
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020105006-87872.png)
( )
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020105002-16103.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020104956-90597.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020104956-21405.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020104956-30463.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020104956-54823.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020104957-95778.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020104957-33044.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020104957-65642.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020104947-71650.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020104947-78553.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020104947-15379.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020104947-17451.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020104948-17676.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020104948-87959.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020104948-73512.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020104948-85072.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020104949-19840.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020104943-62395.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020104944-80847.gif)
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