概念是事物本质属性在头脑中的反映，是知识体系中的核心成份和思维活动的最重要工具之一。准确地理解掌握概念，是顺利完成数学学习，正确实施判断、推理的基础，在教学实践中，学生由于没有正确理解概念，而导致解题错误，形成学习障碍的现象普遍存在．下面就自己的教学实践 Concept is the reflection of the essential attribute of things in the mind, which is one of the most important tools in the core of knowledge system and thinking activity. To understand the mastery of concepts accurately is the basis for the successful completion of mathematics learning and the correct implementation of judgments and reasoning. In the teaching practice, students fail to understand the concepts and lead to the problems of learning and learning. The phenomenon of learning disability is ubiquitous. The following on their own teaching practice