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在复习“比”的知识时,我曾总结过:“0”这个 数在小学数学中有三不能。一是在除法运算中不 能作除数;二是在分数中不能作为分母;三是在 “比”中不能作比的后项。 一个学生举手问:“0”为何三不能呢?他的问题引起大家的哄笑,“那还不知道,无意呗。”该生继续问:“0”作除数为何就无意义呢?这时同学们面面相觑无以答对了。“老师,给我们讲讲吧。”望着一双双祈盼的目光,我组织了“零作除数为何无意义”的讨论。
In reviewing the knowledge of “ratio”, I have concluded: “0” This number of three primary school mathematics can not. First, the division operation can not be used as a divisor; Second, the score can not be used as a denominator; Third, the “ratio” can not be compared to the latter. One student raised his hand and asked: “0” why three can not? His question arouses everyone's laughter, “that does not know, no intention to chant.” The students continue to ask: “0” for the divisor why it does not mean? The students looked at each other without answers. “Teacher, let us talk about it.” Looking at a double pray for hope, I organized a “zero-sum divisor why meaningless” discussion.