命题“∃x∈R+,x>x2”的否定是 .
考点分析:
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“m>n>0”是“方程mx
2+ny
2=1表示焦点在x轴上的椭圆”的( )
A.充分不必要条件
B.必要不充分条件
C.既不充分也不必要条件
D.充要条件
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椭圆
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101913029610746/SYS201311031019130296107010_ST/0.png)
的焦距等于2,则m的值为( )
A.5或3
B.5
C.8
D.16
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袋中有2个白球,2个黑球,从中任意摸出2个(每个小球被摸到是等可能的),则至少摸出1个黑球的概率是( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101913029610746/SYS201311031019130296107009_ST/0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101913029610746/SYS201311031019130296107009_ST/1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101913029610746/SYS201311031019130296107009_ST/2.png)
D.
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如图,四边形ABCD是一个边长为1的正方形,△MPN是正方形的一个内接正三角形,且MN∥AB,若向正方形内部随机投入一个质点,则质点恰好落在△MPN的概率为( )
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101913029610746/SYS201311031019130296107008_ST/images0.png)
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101913029610746/SYS201311031019130296107008_ST/0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101913029610746/SYS201311031019130296107008_ST/1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101913029610746/SYS201311031019130296107008_ST/2.png)
D.
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如图所示,程序框图(算法流程图)的输出结果是( )
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101913029610746/SYS201311031019130296107007_ST/images0.png)
A.-3
B.-2
C.5
D.8
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