过去,按教材编排的顺序,教学正反比例,都是先教正比例,再教反比例。学生刚开始学正比例时,比较顺利,但学到反比例时,就有些辩别不清,当把两种比例并在一起综合练习,就更易混淆了。针对这一情况,我把这部分内容重新组合,同时教学正反比例的意义。由于练习内容多样,学生要通过分析、对比才能作出判断,有利于提高学生的思维能力和解题能力,还能缩短课时,收到较好 In the past, according to the order of teaching materials, teaching is inverse proportion, are pre-teaching is proportional, and then teach inverse proportion. When the students started to learn a positive proportion, they were relatively smooth. However, when they learned the inverse proportion, they were somewhat disagreeable. When the two kinds of ratios were combined and practiced together, they were more confused. In response to this situation, I put this part of the reorganization, while teaching the meaning of positive and negative proportion. Due to the variety of exercises, students through analysis, comparison can make judgments, is conducive to improving students' thinking skills and problem solving skills, but also shorten the class, received better