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本节课教师重视知识体系的自主建构,注重引导与铺垫,使教学难点得到有效突破,学生的思维能力得到有效提升,主要有以下四个特点:1关注公理化体系的构建“相似三角形的判定”包括相似三角形的定义、平行线分线段成比例的基本事实以及基本事实在三角形中的结论、相似三角形的判定定理四个内容。本节课是对相似三角形的判定定理的教学,但教师并没有将它们割裂,在课的开头回顾了平行线分线段成比例
In this lesson, teachers attach importance to the autonomous construction of knowledge system, pay attention to guidance and bedding, make effective breakthrough in teaching difficulties, and effectively improve students’ thinking ability. They mainly have the following four characteristics: 1 Focus on the construction of axiomatic system Judgment "includes the definition of similar triangles, the basic facts that the parallel lines are proportional to the line segments, and the conclusion that basic facts are in triangles and the judgment theorems of similar triangles. This lesson is a teaching of the judgment theorem for similar triangles, but the teacher did not split them. At the beginning of the lesson, I recalled that the parallel lines were proportional to the line segments