摘要
恰当的反例从另一个角度让学生理解数学的本质，能加深学生对数学知识的理解，从而培养学生思维的缜密性、灵活性、发散性和创新性。
Appropriate counter example from another point of view,let the students to understand the essence of mathematics, students to enhance their understanding of mathematical knowledge, so as to cultivate students＇ divergent,meticulous, flexibility and innovation.
关键词
反例
知识
命题
counter example
knowledge
proposition
