往返相遇问题因为涉及相向和同向“行走”以及“碰面相遇”和“追及相遇”等问题,使得不少师生对这类问题的解答经常感到很棘手.我们在折线图基础上,结合实际生活规律,发现了这类问题中的两个非常有启发意义并且非常实用的规律———“必然不相遇规律”和“必然相遇规律”,这对 The problem of round-trip encounters involves the problems of confrontation and co-orientation “walking” and “meeting each other” and “chasing and meeting each other.” Many teachers and students often find it difficult to answer questions of this kind. We are on the basis of the line chart, combined with the actual The law of life has found two very inspiring and very practical laws of this type of problem—“the law of necessity does not meet” and “the law of inevitable encounters”.