题目
题型:不详难度:来源:
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027103700-77776.png)
⑵
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027103701-10304.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027103701-98920.png)
⑶
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027103701-43910.png)
解析
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027103701-94104.png)
(2)恰有两人击中目标等价于
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027103702-23047.png)
(3)可以利用对立事件的概率计算公式求解即
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027103702-43281.png)
记“甲射击一次击中目标”为事件A,“乙射击一次击中目标”为事件B,“丙射击一次击中目标”为事件C, 根据题意,事件 A,B,C ,
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027103701-94104.png)
⑴
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027103702-40368.png)
⑵
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027103702-47012.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027103701-98920.png)
⑶
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027103703-55669.png)
核心考点
试题【(12分)甲、乙、丙三人各进行一次射击,如果三人击中目标的概率都是0.6,求⑴三人都击中目标的概率;⑵其中恰有两人击中目标的概率;⑶至少有一人击中目标的概率.】;主要考察你对相互独立事件的概率等知识点的理解。[详细]
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027103647-66504.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027103647-78090.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027103647-86235.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027103648-94596.png)
(1)定义横、纵坐标为整数的点为“整点”,在区域
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027103647-78090.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027103648-87610.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027103648-28211.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027103648-94596.png)
(2)在区域
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027103647-78090.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027103648-87610.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027103648-87610.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027103648-94596.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027103648-59967.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027103648-59967.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027103649-54869.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027103649-65008.png)