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行程应用题中的超车和错车问题实质是相遇和追及问题的应用.可以通过线段图来分析,在理解的基础上归纳出解题的固定模式.1.相遇问题关系式:甲的行程+乙的行程=总路程.2.追及问题关系式:追者的行程-被追者的行程=间隔的路程.3.超车(追及问题)从快车头部追上慢车尾部开始超车,直到快车尾部追上慢车头部结束超车.这实际上是快车尾部对慢车头部的一个追及问题.车的头
Travel problems in the overtaking and the wrong car is the essence of meet and catch up with the application of the problem.It can be analyzed by the line drawings, based on the understanding of the induction of a fixed pattern of problem-solving.1.An encounter problem relationship: A trip + B Of the trip = total distance .2 chase the relationship between the problem: chaser’s journey - be chaser’s trip = interval of distance .3 overtaking (chasing the problem) from the head of the express train to catch up with the tail of the local car overtake until the trailing tail chase The local car at the end of the overtaking .This is actually a tail on the local trains to catch the problem.