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在研究几条线段长之和(差)的最小或最大值时,常常需要把这些线段集中到一起,然后将其与某条长度固定的线段进行比较.把其中的部分特殊点进行恰当的轴对称变换,是实现这一目标的有效手段.现举例说明,供同学们参考.
When studying the minimum or maximum value of the sum (difference) of the lengths of several line segments, it is often necessary to group these line segments together and then compare them with a fixed-length line segment. Take some of these special points to the appropriate axis. Symmetrical transformation is an effective means to achieve this goal. Here is an example for students to refer to.