【思维导图】【名师箴言】《译林》杂志曾刊载过这样一则笑话:父:如果你有一个橘子,我再给你两个,那你数数看一共有几个橘子?子:我不知道,因为在学校里,我们是用苹果数的.这只是一则笑话而已,在我们的现实生活中应该不会存在.老师在教学生时,一定是这样教的:1个橘子+2个橘子=3个橘子,1个苹果+2个苹果=3个苹果,1个人+2个人=3个人,1棵树+2棵树=3棵树,…,直至抽象出1+2=3.数学抽象本就是一种概括,一种建 [Mind map] [Proverbs] “Lin” magazine has published such a joke: Father: If you have an orange, I give you two, then you count to see a total of several oranges? Sub: I do not know, because in the school, we are using apples. This is just a joke, in our real life should not exist. Teachers in teaching students, it must be taught: 1 orange + 2 oranges = 3 oranges, 1 apple + 2 apples = 3 apples, 1 person + 2 individuals = 3 individuals, 1 tree + 2 trees = 3 trees, ... until 1 + 2 = Mathematical abstraction is a kind of generalization, a kind of construction