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某人5次上班途中所花的时间(单位:分钟)分别为x,y,10,11,9.已知这组数...
某人5次上班途中所花的时间(单位:分钟)分别为x,y,10,11,9.已知这组数据的平均数为10,方差为2,则|x-y|的值为( )
A.1
B.2
C.3
D.4
考点分析:
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,则点P到平面ABC的距离为( )
A.
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C.
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D.1
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如图,一个矩形的长为5,宽为2,在矩形内随机地撒300颗黄豆,数得落在阴影部分的黄豆数为138颗,则我们可以估计出阴影部分的面积约为( )
A.
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B.
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C.
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D.
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椭圆
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的两个焦点为F
1、F
2,过F
1作垂直于x轴的直线与椭圆相交,一个交点为P,则P到F
2的距离为( )
A.
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B.
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C.
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D.4
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若焦点在x轴上的椭圆
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的离心率为
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,则m=( )
A.
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B.
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C.
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D.
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