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一、教学案例近期,本市举行了一次“初中青年数学教师优质课比赛”活动,本文介绍其中一节课《直线、射线、线段》的优秀教学案例,提出笔者对此的赏析与思考,旨在与各位同仁交流提高.教学片段本课以画直线作为一条主线,引出两点确定一条直线,并对这个事实的应用做了介绍,然后再讲三类线的表示方法.师:我们已知两点确定一条直线,所以可以用A、B两个点来表示这条直线(如图1),称为“直线AB”或“直线BA”.现在请问:这条直
First, the teaching case Recently, the city held a “junior high school mathematics teacher quality competition ” activities, this article introduces one of the courses “straight line, ray, line,” the excellent teaching case, the author of this Appreciation and reflection , Aims to exchange and improve with your colleagues.This section of the lesson to draw a straight line as a main line, draw two points to determine a straight line, and the application of this fact has been introduced, and then talk about three lines of representation. Known two points to determine a straight line, so you can use A, B two points to represent this line (Figure 1), known as the “straight line AB ” or “straight line BA ” Now please: This is straight