初中同学学数学,一般习惯于正面去理解概念,直接运用定义、定律、法则、公式等数学知识,其逆向应用往往被忽视.而在解题中一些正向思维难以解决的问题,通过逆向思维,往往能获得简捷的解题效果.因此,同学们在学习中要有意识地加强逆向思维的训练,以便熟练活用和巩固所学得的知识. Junior high school students learn mathematics, and they are usually used to understand the concepts positively, and directly use the mathematical knowledge such as definitions, laws, rules, formulas, etc. The reverse application is often neglected. In the problem solving, some forward thinking is difficult to solve, through reverse thinking. It is often possible to obtain a simple solution to the problem. Therefore, the students must consciously strengthen the training of reverse thinking in their studies in order to use and consolidate the learned knowledge.