同时抛掷三枚均匀的硬币,出现两个正面一个背面的概率是 .
考点分析:
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点Q在x轴上,若存在过Q的直线交函数y=2
x的图象于A,B两点,满足
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224910278442092/SYS201311012249102784420009_ST/0.png)
,则称点Q为“Ω点”,那么下列结论中正确的是( )
A.x轴上仅有有限个点是“Ω点”
B.x轴上所有的点都是“Ω点”
C.x轴上所有的点都不是“Ω点”
D.x轴上有无穷多个点(但不是所有的点)是“Ω点”
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设S=x
2+2xy+2y
2+2x+1,其中x∈R,y∈R,则S的最小值为( )
A.1
B.-1
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224910278442092/SYS201311012249102784420008_ST/0.png)
D.0
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已知k∈Z,
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224910278442092/SYS201311012249102784420007_ST/0.png)
,
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,
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,则△ABC是直角三角形的概率是( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224910278442092/SYS201311012249102784420007_ST/3.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224910278442092/SYS201311012249102784420007_ST/4.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224910278442092/SYS201311012249102784420007_ST/5.png)
D.
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记O为坐标原点,已知向量
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224910278442092/SYS201311012249102784420006_ST/0.png)
,
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224910278442092/SYS201311012249102784420006_ST/1.png)
,又有点C,满足
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224910278442092/SYS201311012249102784420006_ST/2.png)
,则∠ABC的取值范围为( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224910278442092/SYS201311012249102784420006_ST/3.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224910278442092/SYS201311012249102784420006_ST/4.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224910278442092/SYS201311012249102784420006_ST/5.png)
D.
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函数f(x)=ln|x-1|-x+3的零点个数为( )
A.0
B.1
C.2
D.3
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