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问题如图1,在直线l的同侧有两点A、B,在l上求作一点C,使CA+CB最小.分析这是一个求两线段和最小的问题,可考虑把两线段“接”成一条线段,根据“两点间线段最短”得以解决.
The problem is shown in Figure 1. There are two points A and B on the same side of the straight line l. Let l be a point C on l to make CA+CB the smallest. Analysis This is a problem of finding two lines and the smallest problem. Consider two lines. “Connected” into a line, according to “the shortest point between the two points” can be resolved.