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同学,你在学习列方程解应用题的“行程问题时,一定伤过不少脑筋,甚至有的题百思不得其解吧?下述三个推论可为你排忧解难。我们都知道公式:S(路程)=V(速度)·t(时间),但如果遇到一个物体的两种运动状态,或两个(或多个)物体的相对运动问题时,则有:S_1=v_1t_1,S_2=v_2t_2,据此可得(同学们可用语言表述下列三个推论)。推论一若S_1=S_2,则v_1/v_2=t_2/t_1;
Classmates, you must have suffered a lot of headaches when studying the problem of solving equations in the application of equations. Even some questions may not be understood. The following three inferences can solve problems for you. We all know the formula: S (distance) = V (speed) · t (time), but if you encounter an object in two motion states, or two (or more) objects relative motion problems, then there are: S_1 = v_1t_1, S_2 = V_2t_2, according to which available (the students can use the language to describe the following three corollaries).Corollary if S_1=S_2, then v_1/v_2=t_2/t_1;