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前段时间,笔者参加了继教网省农村小学数学骨干教师国培辅导工作,培训期间一位参训教师问我对他们学校考试试卷中的一道题的看法。题目如下:一辆汽车从A点出发经过B点到达C点,时间与路程图如下所示。问:1.这辆汽车从A点到C点的平均速度是多少?2.这辆汽车返回时的速度是多少?阅卷时老师们对问题一的解答出现了争议,一种观点认为,这辆车从A点到C点的行驶的时间是4小时,速度应是:160÷4=40(千米/时);另一种观点则
Some time ago, I participated in the network of provincial primary school mathematics backbone teachers Guo Pei counseling, training during a training teacher asked me questions on their school exams a question. The title is as follows: A car starting from point A through point B to reach point C, time and distance map as shown below. Q: 1. What is the average speed of the car from point A to point C? 2. What is the speed at which the car returns? Questions arise from teachers’ questions about the answer to the question during the marking period. One view is that The car travels from point A to point C for 4 hours at a speed of 160 ÷ 4 = 40 (km / h); another view