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在小学数学教学网上网友bsxxgrg发了一个讨论帖:《这道题怎样讲,学生才能理解?》(http://bbs.xxsx.cn/dispbbs.asp?boardid=42&Id=64188&page=4)。帖子中提到的是一道判断题:“表面积相等的两个长方体,体积也相等。”这个说法是错误的。但怎样才能使学生理解上述判断呢?帖子的下面有几个网友给出了一致的意见——举个反例。网友bsxxgrg跟帖说:“举个恰当的反例很容易啊!”于是,我试着通过简单的演算想找出一个反例。然而结果出乎意料,这样的反例并不是那么容易就能找出来。我又把问题拿到办公室,让同年级组其他数学教
In primary school mathematics teaching online users bsxxgrg made a discussion post: “how to say this question, students can understand?” (Http://bbs.xxsx.cn/dispbbs.asp?boardid=42&Id=64188&page=4). Mentioned in the post is a judgment question: “Two cuboids of equal surface area, the volume is also equal. ” This statement is wrong. But how to make the students understand the above judgment? There are several netizens below the post that give the same opinion - for example, a counterexample. User bsxxgrg thread said: “It is easy to give an appropriate counterexample!” So, I tried to find a counterexample by a simple calculation. However, the result was unexpected. Such counterexample is not so easy to find out. I took the problem again to the office and taught other math classes in the same grade