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投掷一枚质地均匀的骰子两次,若第一次面向上的点数小于第二次面向上的点数我们称其为...
投掷一枚质地均匀的骰子两次,若第一次面向上的点数小于第二次面向上的点数我们称其为正实验,若第二次面向上的点数小于第一次面向上的点数我们称其为负实验,若两次面向上的点数相等我们称其为无效.那么一个人投掷该骰子两次后出现无效的概率是( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025123704043313633/SYS201310251237040433136006_ST/0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025123704043313633/SYS201310251237040433136006_ST/1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025123704043313633/SYS201310251237040433136006_ST/2.png)
D.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025123704043313633/SYS201310251237040433136006_ST/3.png)
考点分析:
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1(-4,0),F
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2的面积的最大值为12,则该椭圆的标准方程为( )
A.
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D.
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