若圆锥曲线
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+
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=1的焦距与k无关,则它的焦点坐标是
.
考点分析:
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已知椭圆
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+
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=1,过右焦点F作不垂直于x轴的弦交椭圆于B两点,AB的垂直平分线交x轴于N,则|NF|:|AB|等于( )
A.
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B.
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C.
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D.
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如图,过抛物线y
2=4x焦点的直线依次交抛物线与圆(x-1)
2+y
2=1于A,B,C,D,则|AB|•|CD|=( )
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A.4
B.2
C.1
D.
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若椭圆
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和连接A(1,1)、B(2,3)两点的线段没有公共点,则实数a的取值范围是( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101225209481119248/SYS201311012252094811192009_ST/1.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101225209481119248/SYS201311012252094811192009_ST/2.png)
C.
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D.
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与y轴相切且和曲线x
2+y
2=4(0≤x≤2)内切的动圆的圆心的轨迹方程是( )
A.y
2=-4(x-1)(0<x≤1)
B.y
2=4(x-1)(0<x≤1)
C.y
2=4(x+1)(0<x≤1)
D.y
2=-2(x-1)(0<x≤1)
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已知
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,N={(x,y)|y=x+b},若M∩N≠∅,则b∈( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101225209481119248/SYS201311012252094811192007_ST/1.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101225209481119248/SYS201311012252094811192007_ST/2.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101225209481119248/SYS201311012252094811192007_ST/3.png)
D.
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