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分别把写有1,2,3,4数字的四张纸片放入一盒中,每次取一张记数字为m,放回后再...
分别把写有1,2,3,4数字的四张纸片放入一盒中,每次取一张记数字为m,放回后再取一张记数字为n,设P(m,n)为平面中的点,则点P(m,n)∈{(x,y)|9x
2+16y
2≤144}的概率为( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183708304772936/SYS201310241837083047729009_ST/0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183708304772936/SYS201310241837083047729009_ST/1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183708304772936/SYS201310241837083047729009_ST/2.png)
D.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183708304772936/SYS201310241837083047729009_ST/3.png)
考点分析:
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![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183708304772936/SYS201310241837083047729005_ST/4.png)
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