“变”和“不变”是一对矛盾,矛盾的双方既对立又统一,中学数学中含有许多“变”和“不变”的因素,在教学中,利用“变”和“不变”的辩证规律,引导学生观察事物,发现矛盾,分析矛盾,解决矛盾,可以在知识得到深化和发展的同时,发展学生的思维,并逐步培养学生辩证唯物主义观念。 “Change” and “invariability” are a pair of contradictions. Both sides of the contradiction are both antagonistic and unity. Middle school mathematics contains many “changes” and “unchanged” factors. In teaching, “change” and “invariability” are used. The dialectical laws that guide students to observe things, discover contradictions, analyze contradictions, and resolve contradictions can develop students’ thinking while at the same time deepening and developing knowledge, and gradually cultivate students’ dialectical materialism.