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过抛物线y2=2px(p>0)的焦点F作倾斜角为45°的直线交抛物线于A、B两点...
过抛物线y2=2px(p>0)的焦点F作倾斜角为45°的直线交抛物线于A、B两点,若线段AB的长为8,则p= .
考点分析:
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=1内以点P(-2,1)为中点的弦所在的直线方程为
.
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.若以A,B为焦点的椭圆经过点C,则该椭圆的离心率e=
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设抛物线y
2=2x的焦点为F,过点M(
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=( )
A.
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C.
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D.
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已知点P是抛物线y
2=2x上的一个动点,则点P到点(0,2)的距离与P到该抛物线准线的距离之和的最小值为( )
A.
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B.3
C.
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D.
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抛物线y
2=ax(a≠0)的准线方程是( )
A.x=-
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B.x=
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C.x=-
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D.x=
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