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若以连续抛掷两次骰子分别得到的点数m、n作为点P的坐标,则点P落在圆x2+y2=...
若以连续抛掷两次骰子分别得到的点数m、n作为点P的坐标,则点P落在圆x
2+y
2=16内的概率为( )
A.
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B.
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C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024182919629976555/SYS201310241829196299765006_ST/2.png)
D.
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}(n∈N
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B.
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D.
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设
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、
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、
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是单位向量,且
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,则
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•
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A.-2
B.
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-2
C.-1
D.1-
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A.
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B.
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C.
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D.
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