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新编课本第十册关于比和比例的教材,同过去使用的传统教材相比,新教材在比和正反比例的基本概念以及基本应用方面,作了较大的变动。这些变动,贯穿了一项基本要求,那就是渗透变量相依的函数思想。我们在教学时,一定要很好地钻研教材,吃透教材的精神,掌握教材的重点,为此,提出三个问题来与同志们讨论研究。I.怎样引进比的概念?为了引进比的概念,我们要引导学生联系实际去理解两数相除的意义。如教材的第一例,用“3÷2”求长是宽的几倍,有时把长是的宽几倍说
The new textbook tenth volumes on the ratio and proportion of textbooks, compared with the traditional textbooks used in the past, the new textbooks in the ratio and the basic concept of positive and negative proportion as well as the basic application, made a significant change. These changes, which run through a basic requirement, are the functional ideas that infiltrate variables. When we are teaching, we must study well the textbooks, understand the spirit of the textbooks and grasp the key points of the textbooks. Therefore, we put forward three questions to discuss with the comrades. I. How to introduce the concept of ratio? In order to introduce the concept of ratio, we should guide students to contact the actual understanding of the meaning of dividing the two numbers. Such as the first case of teaching materials, with “3 ÷ 2” is a few times longer and sometimes several times longer