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抛物线y2=8x的焦点为F,过F作直线l交抛物线于A、B两点,设,,则=( ) ...
抛物线y
2=8x的焦点为F,过F作直线l交抛物线于A、B两点,设
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,
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,则
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=( )
A.4
B.8
C.
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D.1
考点分析:
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椭圆
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的四个顶点A,B,C,D构成的四边形为菱形,若菱形ABCD的内切圆恰好过焦点,则椭圆的离心率是( )
A.
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B.
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C.
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D.
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在空间四边形OABC中,
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,
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,
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,点M在线段OA上,且OM=2MA,N为BC的中点,则
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等于( )
A.
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)′=1+
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)与抛物线y
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)
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)
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