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一、引例几何模型:条件:如图1,点A、B是直线l同旁的两个定点.问题:在直线l上确定一点P,使PA+PB的值最小.
First, the reference geometry model: Conditions: As shown in Figure 1, point A, B is a straight line l with the two fixed-point. Question: Determine a point P on the line l, PA + PB minimum.