题目内容

已知A.B.C是平面上不共线的三点,O为△ABC的外心,动点P满足(λ∈R,), 则P的轨迹一定过△ABC的

                                                                                                                              (    )

      A.内心                    B.垂心                   C.重心                   D.AC边的中点

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