人教版小学数学第8册“三角形”单元有“三角形稳定性”这一内容,原来的实验教材将此内容与“三角形认识”合并一节课进行教学,容量大,蜻蜓点水,难以落实。修改后的教材将此内容独立进行教学,让学生有充裕的时间进行探究、体验,足见编者对此内容的重视。此内容是三角形的一项重要特征,且具有应用的广泛性.教师应引起高度重视,并将此知识的教学落到实处,提升学生这方面的数学素养。但是,现实教学中部分教师的教学出现偏差,现剖析如下,与 PEP 8 elementary school mathematics “” triangle “unit has ” triangle stability “this content, the original experiment teaching material will this content and ” triangle cognition "merge a class to teach, the capacity is big, Superficial, difficult to implement. The revised textbook will be independent of this content teaching, so that students have plenty of time to explore, experience, which shows editors focus on this content. This content is an important feature of the triangle, and has a wide range of applications.Teachers should pay close attention to, and put this knowledge into practice, improve students’ mathematical literacy in this area. However, the teaching of some teachers in the real teaching deviates from the teaching, and now it is analyzed as follows