1.正整数或自然数是数学的基础,但人们是什么时候开始使用数字的呢?最早的阶段可能是配对,如一颗石子配一头牛,数石子即可知出门时有几头牛,回家时有没有丢失。第二个阶段可能是三个概念:“一样多”“比较少”“比较多”。第三个阶段则是命名,这也可能是从配对来的,如“二”对应于两个耳朵、一双眼睛,“五”对应于五个手指,“十”对应于两只手的手指。数字的第四阶段是排序,第五 1. A positive integer or natural number is the basis of mathematics, but when did people start using numbers? The earliest stages may be pairing, such as a stone with a cow, a few stones can know a few cattle when going out, go home Is there any loss? The second phase may be three concepts: “as many ” “less ” “more ”. The third stage is naming, which may also be from the pairing, such as “two ” corresponds to two ears, a pair of eyes, “five ” corresponds to five fingers, “ten ” corresponds to Two hand fingers. The fourth stage of the numbers is the sort, the fifth