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新编小学数学第十册《比和比例》中正、反比例两节,根据我的学习体会,教材的重点要放在使学生建立正、反比例的概念,引导学生分析和研究正、反比较中X、Y的变化规律上。教材在引入正、反比例概念以后,安排了大量判断正、反比例的题目,意图是在通过这些题目的练习,观察X、Y的变化规律,来加深学生对正、反比例概念的理解。也安排了一些用比例解应用题的例题和练习题,这些应用题的练习,主要是使学生认识到以前学过的一些应用题中的两种相
The new primary school mathematics tenth book “ratio and proportion” in the positive and negative two, according to my learning experience, teaching materials should focus on enabling students to establish the concept of positive and negative proportion, and guide students to analyze and research positive and negative contrast X , Y changes in the law. After introducing the concepts of positive and inverse proportion, the textbook has arranged a large number of questions for judging positive and negative proportion. The intent is to deepen students' understanding of the concept of positive and inverse proportion by observing the variation rules of X and Y through the practice of these topics. There are also some examples and exercises that are used to solve the problem in a proportional way. The practice of these problems is mainly to make the students recognize the two phases of some applied problems