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我教北师大版六年级数学下册教材已是第六个年头了,对于教材编排上的几个问题一直困惑不解,现提出来与大家讨论。1.“一定”与“相同”。教材在第25—26页教学正比例时用了三个情境,第2个情境中:从表中你发现了什么规律?结论是“路程与时间的比值(也就是速度)相同”。第3个情境中:从表中你发现了什么规律?结论是“应付的钱数与质量的比值(也就是单价)相同”。最后的结论是“第2题的表中。时间增加,所走的路程也相应增加,而且路程与时间的比值(速度)相同,那么我们说路程和时间成正比例。”
I teach the Beijing Normal University version of the sixth grade math textbook is the sixth year, and for several problems in the textbook layout has been puzzled, now put forward to discuss with you. 1. “must ” and “the same ”. The textbook uses three situations when teaching is proportional on pages 25-26. In the second scenario: What law did you find from the table? The conclusion is that “the ratio of distance to time (that is, the speed) is the same.” In the third scenario: What rule did you find out from the table? The conclusion is that “the amount of money to be paid is the same as the mass (that is, the unit price)”. The final conclusion is that in the table of question 2, as the time increases, the distance traveled increases correspondingly, and the ratio of the distance to the time (speed) is the same, then we say that the distance traveled is proportional to the time.