一、建议讲一讲比较分数大小的条件。现行课本没交代分数大小比较的条件。事实上,在某些条件下,分数是不便于比较其大小的。如1/2米和3/4公斤,二者属异类量,是两个完全不同的单位“1”,就难于对它们进行大小比较。即算是同类量,在下图情况下,表示阴影部分的两个分数1/2和 First, it is recommended to talk about the conditions for comparing the size of scores. The current textbook does not account for the conditions of the fractional size comparison. In fact, under certain conditions, scores are not convenient to compare their size. Such as 1/2 meter and 3/4 kilogram, both of which are alien species, are two completely different units “1”, it is difficult to compare the size of them. That is considered the same amount, in the case of the next figure, that the shaded part of the two scores of 1/2 and