例题如图1公路同侧有两个村庄A、B, 要在公路上建造车站尸,使尸到A、B的距离之 和最短,问车站P应建在何处? 分析:间建在何处 线路最短,即在公路上 求一点,使到A、B的距 离之和最短.由于两点 之间线段最短,但直接 夕 李 连结显然不妥,这是由于A、B在公路的同侧, 因此我们设想:将 Example: There are two villages A and B on the same side of the road as the road. To build a station corpse on the highway, the sum of the distance from the corpse to A and B should be the shortest, and where should the station P be built? Analysis: The shortest route is to find a point on the highway so that the sum of the distances to A and B is the shortest. Since the line between the two points is the shortest, it is obviously not appropriate to link the direct Xi and Li. This is because A and B are on the same side of the highway. So we envision: