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已知抛物线C:y2=2px (p>0)上一点P(6,m)到其焦点F的距离为7,则...
已知抛物线C:y2=2px (p>0)上一点P(6,m)到其焦点F的距离为7,则抛物线C的以点M(2,1)为中点的弦AB所在直线的方程为 .
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A.2
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+1
B.
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C.
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D.
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