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一切事物都是从无到有,“+”“-”这两个常用的符号,也和数学的产生一样,是劳动人民在劳动生活中根据需要而创造出来的。下面说的是它们发展的过程: 在古代希腊和印度的数学家们,他们把两个数写在一起就表示加法,如:3+1/4写成3 1/4,也就是说:今天我们所用的带分数3 1/4,就代表当时的加法。另外把两个数之间离开一点,就表示减法的意思,如:3 1/4之间没有符号,就表示3-1/4。又经过多少年以后,有许多人用拉丁文的“P”“P”或者
All things are from scratch. The two commonly used symbols, “+” and “-”, are also the same as the birth of mathematics. They are created by the working people according to their needs in their working life. The following is the process of their development: In ancient Greek and Indian mathematicians, they added two numbers together to represent additions, such as: 3+1/4 written as 3 1/4, that is: Today we The use of a score of 3 1/4 represents the addition at that time. In addition to separating the two numbers, it means the meaning of subtraction. For example, if there is no symbol between 3 1/4, it means 3-1/4. After many more years, many people use the Latin “P” or “P” or