已知一圆经过点A(2,-3)和B(-2,-5),且圆心C在直线l:x-2y-3=0上,求此圆的标准方程.
考点分析:
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在△ABC中,
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,若以A,B为焦点的椭圆经过点C,则该椭圆的离心率是( )
A.
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D.
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