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设O为坐标原点,M(2,1),点N(x,y)满足,则的最大值是 ( ) A 9...

 设O为坐标原点,M(2,1),点N(x,y)满足6ec8aac122bd4f6e,则6ec8aac122bd4f6e的最大值是                                                              (    )

A  9                 B 2                C 6                 D 14

 

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