题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027070729-71268.gif)
(1)若
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027070729-66688.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027070729-30694.gif)
(2)若
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027070730-79884.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027070729-30694.gif)
答案
(1)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027070730-33955.gif)
(2)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027070730-82888.gif)
解析
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027070730-86385.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027070730-18612.gif)
1 | + | + | + |
0 | 0 | + | + |
-1 | - | 0 | + |
y x | 0 | ![]() | 2 |
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027070729-66688.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027070730-44592.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027070730-83783.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027070730-46875.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027070730-57899.gif)
则基本事件如右表…………………3分
基本事件总和
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027070731-85996.gif)
其中满足“
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027070729-30694.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027070731-61272.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027070730-33955.gif)
故
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027070729-66688.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027070729-30694.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027070731-58580.gif)
(2)设事件“
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027070731-14676.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027070730-44592.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027070730-46875.gif)
基本事件如右图四边形ABCD区域…………8分
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027070731-40775.gif)
事件B包括的区域如阴影部分
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027070731-30731.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027070732-15105.gif)
故
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027070730-79884.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027070729-30694.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027070730-82888.gif)
核心考点
试题【(本题12分).已知集合(1)若,求的概率;(6分)(2)若,求的概率。(6分)】;主要考察你对等知识点的理解。[详细]
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027070720-57302.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027070720-59919.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027070721-30034.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027070721-70913.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027070718-53309.gif)
A.0.25 | B.0.5 | C.0.6 | D.0.75 |
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027070710-62919.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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