在甲、乙两个盒子中分别装有标号为1、2、3、4的四个球,现从甲、乙两个盒子中各取出1个球,每个小球被取出的可能性相等.
(Ⅰ)求取出的两个球上标号恰好相同的概率;
(Ⅱ)求取出的两个球上的标号至少有一个大于2的概率.
考点分析:
相关试题推荐
已知
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024180248775601371/SYS201310241802487756013016_ST/0.png)
=(sinx,cosx),
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024180248775601371/SYS201310241802487756013016_ST/1.png)
=(cosx,cosx),f(x)=
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024180248775601371/SYS201310241802487756013016_ST/2.png)
(I)求f(x)的最小正周期和单调递增区间;
(II)在△ABC中,角A满足f(A)=
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024180248775601371/SYS201310241802487756013016_ST/3.png)
,求角A.
查看答案
O是平面α上一点,A、B、C是平面α上不共线三点,平面α内的动点P满足
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024180248775601371/SYS201310241802487756013015_ST/0.png)
,若
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024180248775601371/SYS201310241802487756013015_ST/1.png)
时,
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024180248775601371/SYS201310241802487756013015_ST/2.png)
的值为
.
查看答案
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024180248775601371/SYS201310241802487756013014_ST/images0.png)
如图,是判断“美数”的流程图,在[30,40]内的所有整数中“美数”的个数是
.
查看答案
已知
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024180248775601371/SYS201310241802487756013013_ST/0.png)
=2
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024180248775601371/SYS201310241802487756013013_ST/1.png)
,
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024180248775601371/SYS201310241802487756013013_ST/2.png)
=3
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024180248775601371/SYS201310241802487756013013_ST/3.png)
,
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024180248775601371/SYS201310241802487756013013_ST/4.png)
=4
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024180248775601371/SYS201310241802487756013013_ST/5.png)
,…若
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024180248775601371/SYS201310241802487756013013_ST/6.png)
=4
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024180248775601371/SYS201310241802487756013013_ST/7.png)
,(a,t均为正实数),则类比以上等式,可推测a,t的值,a+t=
.
查看答案
如果实数x,y满足条件
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024180248775601371/SYS201310241802487756013012_ST/0.png)
,那么z=2x-y的最小值为
.
查看答案