在数学教学中适当运用反例,可以收到事半功倍的效果.1反例是理解概念的工具数学概念是整个数学大厦的基石.教师要善于利用反例把“死”知识教活.例如,函数的概念对于初学者来说是比较难理解的,利用反例可加深学生对反函数的理解.现举例如下:例1下列图形中,不可能是函数y=f(x)的 Appropriate use of counterexamples in mathematics teaching can achieve a multiplier effect.1 Counterexamples are tools for understanding concepts Mathematical concepts of mathematics are the cornerstone of the entire mathematics building.Teachers should be good at using counterexamples to teach the knowledge of “death.” For example, For beginners is more difficult to understand, the use of counterexamples can deepen the student’s understanding of the inverse function.Examples are as follows: Example 1 The following figure, it is impossible to function y = f (x)