现行高一教材人教版p·33习题1.7第2题第2小题是这样的:“全等三角形一定是相似三角形,写出这个命题的逆命题、否命题和逆否命题”.在课堂上练习这道题时,对结论“一定是相似三角形”的否定引发了一场大讨论,学生争得面红耳赤.笔者也看到许多资料上有类似的题目,一些教师和学生 The current high school textbooks for teachers p.33 Exercise 1.7 Problem 2 The second problem is this: “The congruent triangle must be a similar triangle, and write the contradictory proposition, the proposition, and the negative proposition of this proposition”. When practicing this question, the negation of the conclusion “must be similar to a triangle” caused a big discussion and the students were clamoring. The author also saw many similar topics on many materials, some teachers and students.