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文[1]介绍五道竞赛试题,发生的时间、地点不同,解法完全一致．笔者很受启发,在此,本文再介绍解这五题的另一方法．
The article [1] introduces the five-race test questions. The time and place of occurrence are different, and the solution is exactly the same. The author is very inspired. Here, this article introduces another method to solve these five questions.