题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027030459-75327.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027030459-12279.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027030459-84764.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027030459-56574.gif)
事件A.
(1)若
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027030459-75327.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027030459-12279.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027030500-78297.gif)
(2)若
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027030500-15094.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027030500-10653.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027030500-97950.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027030500-42588.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027030500-78297.gif)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027030501-49482.gif)
(2)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027030501-20271.gif)
解析
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027030501-88049.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027030501-38949.gif)
依题意,
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027030501-45228.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027030502-81295.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027030502-98500.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027030502-57762.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027030502-99256.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027030503-21327.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027030503-53564.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027030502-81295.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027030502-98500.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027030502-57762.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027030502-99256.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027030503-21327.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027030503-87907.gif)
当且仅当“
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027030501-45228.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027030503-53564.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027030502-81295.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027030502-98500.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027030503-17569.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027030503-53564.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027030502-81295.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027030504-47203.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027030503-53564.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027030501-38949.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027030501-38949.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027030504-95642.gif)
从而
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027030501-49482.gif)
(2)在平面直角坐标系
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027030504-40822.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027030504-20386.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027030504-20386.gif)
正方形边长即直线
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027030504-26071.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027030505-45413.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027030505-29681.gif)
正方形的面积
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027030505-99192.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027030505-61076.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027030505-95008.gif)
圆在正方形内部,所以
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027030501-20271.gif)
核心考点
试题【、是常数,关于的一元二次方程有实数解记为事件A.(1)若、分别表示投掷两枚均匀骰子出现的点数,求;(2)若、,且,求】;主要考察你对古典概型的概念及概率等知识点的理解。[详细]
举一反三
A. B. C. D.
⑴若选出的两人性别相同的概率为
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027030437-90347.gif)
⑵若已知该班男生有9人,求选出的两人性别不同的概率。
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027030434-23738.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027030434-21254.gif)
A.颜色全同 | B.颜色不全同 | C.颜色全不同 | D.无红球 |
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027030431-57408.gif)
停止答题,晋级下一轮.假设某选手正确回答每个问题的概率都是0.8,且每个问题的
回答结果相互独立,则该选手恰好回答了4个问题就晋级下一轮的概率等于
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