思维就是人的理性认识的过程,根据思维过程的指向性,可将思维分为:常规思维(正向思维)和逆向思维.中学数学课本中的逆运算、否命题、反证法、分析法、充要条件等都涉及到逆向思维·在数学解题中,通常的思维方式是从已知到结论,然而有些数学题按照这种思维方式解则比较困难,而且 Thinking is the process of a person’s rational understanding. According to the directionality of the thinking process, thinking can be divided into: conventional thinking (positive thinking) and reverse thinking. Inverse mathematics textbooks in middle school, negative proposition, anti-evidence method, analytical method, charge Conditions and so on all involve reverse thinking. In mathematics problem solving, the usual way of thinking is from known to the conclusion. However, some math problems are more difficult to solve according to this way of thinking.