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已知有向线段P1P2,如果点P使得并设O为平面上任意一点,则此式称为有向线段(?)的定比分点P的向量表达式,若令
Known directed segment P1P2, if the point P and set O to any point on the plane, this type of expression is called a vector expression of the point P of the directed segment (?), if