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在解答较复杂的行程问题时,特别是对于一些数学竞赛题中的行程问题,如果能够合理利用以下一些规律,往往可以化繁为简、化难为易。规律一:路程一定,如果两车速度之比是a:b,那么两车所行时间之比是b:a;如果两车所行时间之比是a:b,那么两车所行速度之比是b:a。规律二:时间一定,如果两车所行速度之比是a:b,那么两车所行路程之比是a:b;如果两车所行路程之比是a:b,那么两车所行速度之比是a:b。规律三:速度一定,如果两车所行时间之比是a:b,那么两车
When it comes to solving complex travel problems, especially for the travel problems in some math competitions, if we can make the following rules reasonable, we can often make things simpler and easier. Rule one: the distance must be, if the ratio of the speed of the two cars is a: b, then the ratio of the two cars ’traveling time is b: a; if the ratio of the two cars’ traveling time is a: b, Than is b: a. The second law: the time must be, if the ratio of the speed of the two cars is a: b, then the ratio of the distance traveled by the two cars is a: b; if the ratio of the distances traveled by the two cars is a: b, The speed ratio is a: b. Three laws: the speed must be, if the ratio between the two cars time is a: b, then two cars