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抛物线y=-x2上的点到直线4x+3y-8=0距离的最小值是( ) A. B. ...
抛物线y=-x
2上的点到直线4x+3y-8=0距离的最小值是( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025123721212967866/SYS201310251237212129678008_ST/0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025123721212967866/SYS201310251237212129678008_ST/1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025123721212967866/SYS201310251237212129678008_ST/2.png)
D.3
考点分析:
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(a>0,b>0)右焦点F与其一条渐近线垂直且垂足为A,与另一条渐近线交于B点,
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,则双曲线的离心率为( )
A.
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B.
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C.
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D.2
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已知定点A(1,0)和定直线l:x=-1,在l上有两动点E,F且满足
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,另有动点P,满足
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(O为坐标原点),且动点P的轨迹方程为( )
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C.y
2=-4
D.y
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已知点P是抛物线y
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1,到直线x+y-10=0的距离是d
2,则d
l+d
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A.
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B.2
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C.6
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D.3
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已知双曲线中心在原点且一个焦点为F
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,点P位于该双曲线上,线段PF
1的中点坐标为(0,2),则双曲线的方程为( )
A.
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B.
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C.
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D.
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若双曲线
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(a>b>0)的左右焦点分别为F
1、F
2,线段F
1F
2被抛物线y
2=2bx 的焦点分成7:5的两段,则此双曲线的离心率为( )
A.
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B.
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C.
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D.
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