行程问题是应用题中重要的一种类型。一般行程问题的已知量都是两种,而有些问题的已知量却很单一,只给出路程或时间,一般来说,不设辅助未知数,很难列出正确的方程,这类问题同学们感到比较困难。但是,如果挖掘出这类问题的内在规律,就会大大降低解题的难度,提高解题的速度,调动学生的学习积极性。现将这类问题的规律进行归纳,供读者参考 Trip problems are an important type of application. The known quantity of the general trip problem is two kinds, and the known quantity of some problems is very simple. It only gives the distance or time. In general, without auxiliary unknowns, it is difficult to list the correct equations. Students feel more difficult. However, if we dig out the inherent laws of such problems, it will greatly reduce the difficulty of solving problems, improve the speed of problem solving, and motivate students’ enthusiasm for learning. The laws of these problems are now summarized for the reader’s reference