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小学数学课本中常以“通常……”的表达方式对知识作概括归纳。教学中,不少教师只注意其一般性,忽视了“通常”的另一面——特殊性,甚至都没有提及。这样,将学生禁锢在“通常”之内,不利于学生获取完整、准确的数学知识,使学生的能力发展受到影响。笔者以为,在教学生了解“通常……”的一般意义的同时,也要引导学生想一想“通常……”之外。
Primary school mathematics textbooks often “general ...” expression of knowledge summarized. In teaching, many teachers only pay attention to their generality, neglect the other side of the “usual” - the particularity, they are not even mentioned. In this way, confining students within the “usual” is not conducive to students to obtain complete and accurate mathematical knowledge, the development of students' ability to be affected. The author believes that while teaching students understand the general meaning of “usually ... ...”, but also to guide students to think about “usually ... ...” outside.