笔者有幸参加了一次苏州市初三数学复习研讨会,学习了两节“直线和圆的位置关系”的复习课,两位老师处理问题的风格迥然不同,但是成功的原因如出一辙,即都是一位“善变”的数学老师。这里的“善变”是指巧妙设计变式,激发学生学习的兴趣,点燃学生思维的火花,让学生在不断的探索中复习巩固知识,体会数学的思想、方法,从而提高分析问题和解决问题的能力。一、变式教学,有利于学生把握概念的本质概念是最基本的思维形式。数学中的命题都是由概念构成的,数 I was fortunate enough to attend a seminar on the first three maths in Suzhou and learned the reviewing session of “the relationship between the lines and the circle”. The two teachers have very different styles of dealing with the problems, but the reasons for their success are exactly the same Is a “fickle ” math teacher. Here “fickle ” refers to the ingenious design variants to stimulate students interest in learning, ignite the spark of student thinking, so that students continue to explore review consolidate knowledge, understand the mathematical ideas and methods to improve the analysis of the problem and Ability to solve problems. First, the variant teaching, is conducive to students to grasp the concept of the concept of the essence of the most basic form of thinking. The propositions in mathematics are all composed of concepts