本单元学习内容主要包括比例的意义、比例的基本性质、成正比例和反比例的意义以及比例的应用。下面对教材内容、体系特点以及教学方法,做简要分析。一、教材分析1.挖掘概念内涵,构建知识体系本单元内容涉及众多的概念:比例、比例的基本性质、正比例、反比例、比例尺等。由于比例在现实生活中具有广泛的实用价值,理解概念,弄清它们之间的发展变化,显得 The learning content of this module mainly includes the meaning of ratio, the basic nature of ratio, the meaning of proportional and inverse proportion, and the application of ratio. The following textbook content, system characteristics and teaching methods, make a brief analysis. First, the textbook analysis 1. Excavate the concept of connotation, building a knowledge system This unit covers many concepts: ratio, the basic nature of the ratio, the proportion, inverse proportion, scale and so on. As the ratio in real life has a wide range of practical value, understanding of the concept, to understand the development and changes between them, it seems