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有些复杂的应用题采用常规方法解答起来很繁琐,如果用比例方法解答,就简单多了。例1一辆汽车,从甲城开往乙城,再立即返回,共用了4 9/(10)小时。它去时的速度
Some of the more complicated application questions are complicated to answer using the conventional method, which is much simpler if you use the proportional method. Example 1 A car traveling from City A to City B returned immediately and shared 49 / (10) hours. It’s time to go