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正比例应用题,在学习复合应用题时,已经接触过,那时是用归一法来解答。而这里是要学生学会用正比例知识解答。正比例应用题的解题关键是,能正确判断应用题中哪两个相关联的量成正比例,并列出比例式,教学时,我按以下顺序进行。 1、先用过去学过的归一法解答,使学生看到过去学过的归一问题,还可以用正比例来解答。通过两种方法的比较,使学生掌握用正比例的方法解题的特点
Proportional application questions have already been touched when learning compound application questions. At that time, they were solved using the normalization method. And here is to ask students to learn to answer with proportional knowledge. The key to solving the problem of pro-proportional application is to correctly determine which two related quantities in the application are proportional, and to list the ratios. In teaching, I proceed in the following order. 1. First, use the normalization method learned in the past to enable students to see the normalization problem that they have learned in the past. You can also answer in a straightforward way. Through the comparison of the two methods, the students can master the characteristics of solving the problem with a proportional method.