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小明的讲义夹里放了大小相同的试卷共10页,其中语文2页、数学3页、英语5页,他随...
小明的讲义夹里放了大小相同的试卷共10页,其中语文2页、数学3页、英语5页,他随机地从讲义夹中抽出1页,抽出的试卷恰好是数学试卷的概率为( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101190906720300602/SYS201311011909067203006006_ST/0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101190906720300602/SYS201311011909067203006006_ST/1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101190906720300602/SYS201311011909067203006006_ST/2.png)
D.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101190906720300602/SYS201311011909067203006006_ST/3.png)
考点分析:
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在等腰△ABC中,AB=AC=4,BC=6,那么cosB的值是( )
A.
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B.
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C.
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D.
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如图,在△ABC中,BC=6,M、N分别是AB、AC的中点,则MN等于( )
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A.6
B.3
C.
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A.
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C.
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D.
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函数
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在下列运算中,计算正确的是( )
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