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[复习要求]巩固判断正反比例的知识,使学生能正确、迅速、灵活地解答正反比例应用题。[复习过程]一、出示课题。提出本节要求(略)。二、复习解题关键和判别方法:1.解题关键。问:解正反比例应用题的关键是什么?(答后板书:解题关键——正确判断)追问:根据什么去判断?(正反比例的意义)再追问:正反比例意义各是什么?指两名学生回答。2.判断方法。师:成正、反比例的两种量,它们扩大、缩小时,各有什么规律?如何根据这种规律判断两种量是否成正、反比例呢?答后出示
[Review requirements] to consolidate the knowledge of positive and negative proportion, so that students can correct, rapid and flexible solution to the problem of positive and negative applications. [Review process] First, show the subject. Proposed this section requirements (omitted). Second, review the key to solving problems and discrimination: 1. Solve the key issues. Q: What is the key to solve the problem of positive and negative proportion? (Answer the following key: the key to solve the problem - the correct judgment) Question: What to judge? (Positive and negative proportion of the meaning) Then ask: what is the meaning of the positive and negative proportion? A student replied. 2. Judgment method. Teacher: Cheng Cheng, inverse proportion of the two kinds of volume, they expand, shrink, each have their own law? How to judge according to this law whether the amount of two positive, inverse proportion?