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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...
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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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考点分析:
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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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已知函数
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是奇函数,
(1)求k的值;
(2)在(1)的条件下判断f(x)在(1,+∞)上的单调性,并运用单调性的定义予以证明.
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如图,正四棱锥P-ABCD中,侧棱PA与底面ABCD所成角的正切值为
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.
(1)求侧面PAD与底面ABCD所成二面角的大小;
(2)若E是PB中点,求异面直线PD与AE所成角的正切值.
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