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若点P到直线x=-1的距离比它到点(2,0)的距离小1,则点P的轨迹为( ) A...
若点P到直线x=-1的距离比它到点(2,0)的距离小1,则点P的轨迹为( )
A.圆
B.椭圆
C.双曲线
D.抛物线
考点分析:
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圆:x
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2-2x-2y+1=0上的点到直线x-y=2的距离最大值是( )
A.2
B.
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C.
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D.
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已知椭圆
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2分别为其左右焦点,椭圆上一点M到F
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C.3
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表示双曲线的( )
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B.必要非充分条件
C.充要条件
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直线
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C.150°
D.120°
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如果函数y=f(x)的图象如图,那么导函数y=f′(x)的图象可能是( )
A.
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B.
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C.
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D.
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