反证法是一种间接的证题方法，在初中几何课本第三用中着门提及，学生在学习过程巾出现的错误报务．下面就学生作业中的错误认波反证法的学习．巨证法王要青三个步骤：（1）假设命题的结论不成立。（2）从反设出发经过推理、进亚尼出矛盾．（3）指出假设不正确，从而商定命题正 The counter-evidence method is an indirect method of proof. It is mentioned in the third use of the geometry textbook for junior high school students. Students report errors in the process of learning. The following is the study of student’s homework in the mistaken interpretation of anti-evidence law. The king of the law has three steps: (1) Assume that the conclusion of the proposition is not established. (2) After inference from the anti-establishment, the contradiction between Yani and out. (3) Point out that the hypothesis is incorrect, so as to agree on the proposition