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“x>1”是“x2>x”的( ) A.充分而不必要条件 B.必要而不充分条件 C...
“x>1”是“x2>x”的( )
A.充分而不必要条件
B.必要而不充分条件
C.充分必要条件
D.既不充分也不必要条件
考点分析:
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设集合A={x|-1≤x≤2},B={x|0≤x≤4},则A∩B=( )
A.[0,2]
B.[1,2]
C.[0,4]
D.[1,4]
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已知双曲线C的中心是原点,右焦点为
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131023211953822930975/SYS201310232119538229309011_ST/0.png)
,一条渐近线m:x+
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y=0,设过点A(-3
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,0)的直线l的方向向量e=(1,k),
(1)求双曲线C的方程;
(2)若过原点的直线a∥l,且a与l的距离为
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131023211953822930975/SYS201310232119538229309011_ST/3.png)
,求k的值;
(3)证明:当k>
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131023211953822930975/SYS201310232119538229309011_ST/4.png)
时,在双曲线C的右支上不存在点Q,使之到直线l的距离为
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131023211953822930975/SYS201310232119538229309011_ST/5.png)
.
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已知双曲线
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131023211953822930975/SYS201310232119538229309010_ST/0.png)
,P为C上的任意点.
(1)求证:点P到双曲线C的两条渐近线的距离的乘积是一个常数;
(2)设点A的坐标为(3,0),求|PA|的最小值.
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设双曲线
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131023211953822930975/SYS201310232119538229309009_ST/0.png)
-
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131023211953822930975/SYS201310232119538229309009_ST/1.png)
=1的右顶点为A,右焦点为F.过点F平行于双曲线的一条渐近线的直线与双曲线交于点B,则△AFB的面积为
.
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已知双曲线
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131023211953822930975/SYS201310232119538229309008_ST/0.png)
=1的离心率为
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131023211953822930975/SYS201310232119538229309008_ST/1.png)
,则n=
.
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