“比和比例”备课指要江苏省金湖县徐梁小学沈宝琪江苏省金湖县教育督导室许万明“比和比例”是小学数学教学的重点之一，出是教学中的一个难点。它在日常生活中有着广泛的应用，又是学生学习数理化的基础知识，有承前后后的作用。一、抓住数量的相依关系在本单元知识网中... “Proportional and Proportional” lesson preparation refers to Xuhu Primary School of Jinhu County, Jiangsu Province Shen Baoqi Xu Wanming, Education Supervision Office of Jinhu County, Jiangsu Province “Ratio and Proportion” is one of the focuses of primary school mathematics teaching, which is a difficult point in teaching. It has a wide range of applications in daily life, but also the students learn the basic knowledge of physics and chemistry, have a bearing on the role. First, to seize the number of dependencies in this unit knowledge network ...