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抛物线y2=4x焦点F,则经过点F,M(4,4)且与抛物线的准线相切的圆的个数为...
抛物线y2=4x焦点F,则经过点F,M(4,4)且与抛物线的准线相切的圆的个数为 .
考点分析:
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已知双曲线
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=1(b>0)的离心率为2,则它的一焦点到其中一条渐近线的距离为
.
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曲线C:(5-m)x
2+(m-2)y
2=8(m∈R)表示焦点在x轴上的椭圆,则m取值范围
.
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已知圆C过点(1,0),且圆心在x轴的正半轴上,直线l:y=x-1被该圆所截得的弦长为
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,则圆C的标准方程为
.
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过抛物线y
2=2px(p>0)的焦点F且倾斜角为60°的直线l与抛物线在第一、四象限分别交于A、B两点,则
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的值等于( )
A.5
B.4
C.3
D.2
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设F
1、F
2分别是椭圆
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101924026912917/SYS201311031019240269129008_ST/0.png)
+
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=1(a>b>0)的左、右焦点,与直线y=b相切的⊙F
2交椭圆于E,且E是直线EF
1与⊙F
2的切点,则椭圆的离心率为( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101924026912917/SYS201311031019240269129008_ST/2.png)
B.
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C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101924026912917/SYS201311031019240269129008_ST/4.png)
D.
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