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在求最短路线时,一般我们先用“对称”的方法把求最短路线化成两点之间的最短距离问题,而两点之间直线段最短,从而找到所需的最短路线.像这样将一个问题转变为一个和它等价的问题,再设法解决,是数学中一
In seeking the shortest route, generally we first use the method of “symmetry” to find the shortest route to the shortest distance between two points, and the shortest straight line between two points to find the shortest route required. Transforming a question into a question equivalent to it and then trying to solve it is one in mathematics