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在教学中,发现有相当一部分学生对一“平均问题”的错解。此“平均问题”是:一辆汽车从甲地到乙地的速度是45千米/小时,从乙地到甲地的速度是55千米/小时,求这辆汽车往返的平均速度是每小时多少千米?经常有学生把它错解为:(45+55)÷2=50(千米)。学生的这种解答结果实质是求“45
In teaching, a considerable number of students were found to have misunderstood an “average question”. The “average problem” is that the average speed of a car traveling from Site A to Site B is 45 km / h and that from Site A to Site A is 55 km / h. The average speed of getting a car from one place to another is How many kilometers an hour? Often students misinterpret it as: (45 + 55) ÷ 2 = 50 (km). The result of this kind of solution is essentially "45