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设抛物线的顶点在原点,准线方程为x=-2,则抛物线的方程是 .
设抛物线的顶点在原点,准线方程为x=-2,则抛物线的方程是 .
考点分析:
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2+(y-3)
2=1外切,与直线y=0相切,则C的圆心轨迹为( )
A.抛物线
B.双曲线
C.椭圆
D.圆
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若实数x,y满足
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双曲线
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2=4x的焦点重合,则mn的值为( )
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A.-1
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D.-
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已知圆C
1:(x+1)
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2=1,圆C
2与圆C
1关于直线x-y-1=0对称,则圆C
2的方程为( )
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2=1
D.(x-2)
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2=1
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