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已知两圆半径分别为2,3,圆心距d,若两圆有公共点,那么圆心距d的取值范围是( ...
已知两圆半径分别为2,3,圆心距d,若两圆有公共点,那么圆心距d的取值范围是( )
A.1≤d≤5
B.1<d≤5
C.1≤d<5
D.1<d<5
考点分析:
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若椭圆
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和双曲线
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有相同的焦点F
1,F
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2|等于( )
A.m-a
B.
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C.m
2-a
2D.
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椭圆
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的右焦点为F,设A(
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),P是椭圆上一动点,则|AP|+
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|PF|取得最小值时点P的坐标为( )
A.(5,0)
B.(0,2)
C.(
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)
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,给出下列曲线方程:
①4x+2y-1=0;
②x
2+y
2=3;
③
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;
④
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.
在这些曲线上存在点P满足|MP|=|NP|的所有曲线方程是( )
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B.②④
C.①②③
D.②③④
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2都相切,则动圆圆心M的轨迹方程是( )
A.x=0
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C.
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D.
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若抛物线y
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