初一开始就已经有对几何图形的简单说理,虽然教材要求降低,但学生也往往在这一块知识上摔跟头.教学过程中发现学生有以下几点常见错误.1.不会说理不知从哪里开始进行逻辑推理,在求线段长、求角度中最是常见.学生往往是从一个等号开始,直到结论出现,中间不说一点理由,让他解释也解释不清.2.胡乱说理进行几何论证时,天马行 Since the beginning of the first year, there have been simple explanations for geometric figures. Although the teaching materials are required to be reduced, students often fall over this piece of knowledge. During the teaching process, students are found to have the following common mistakes.1. Starting logical reasoning, it is common to find the length of the line segment and the angle of seeking. Students often start from an equal sign until the conclusion occurs, and there is no reason to explain it, so that he can explain and interpret it unclear. During the demonstration, Tian Maxing