According to historical records, China had a positive and negative concept as early as two thousand years ago.
Liu Hui, a scholar of the Three Kingdoms period, made a major contribution to the concept of establishing negative numbers. Liu Hui first gave the definition of positive and negative numbers. He said: "The opposite of the two calculations is to make the positive and negative names." This means that in the process of calculation, a quantity with the opposite meaning is encountered. Numbers and negative numbers distinguish them.
For the first time, Liu Hui gave a way to distinguish between positive and negative numbers. He said: "The opposite of the two calculations, the opposite is to be positive and negative by name; it is considered red, negative black; otherwise it is different from oblique." This means that the number with a small red stick indicates a positive number, and the number with a small black stick indicates a negative number. You can also use a small pendulum to indicate a negative number, and a small pen with a positive pendulum to indicate a positive number.
In the famous ancient Chinese monograph "Nine Chapters of Arithmetic" (written in the first century AD), the law of positive and negative addition and subtraction was first proposed: "positive and negative numbers": the same name is divided, the name is different, no In the negative, the negative is not positive; its synonyms are divided, the same name is the same, and there is no positive, no negative."
The "name" here is the "number", the "division" is the "minus", the "division" and the "division" are the absolute values of the two numbers "added", "subtracted", "none" is the "zero" . In the present words: "The law of addition and subtraction of positive and negative numbers is: subtracting the two numbers of the same symbol, equal to the subtraction of its absolute value, subtracting the two numbers of the opposite sign, equal to the sum of its absolute values. Zero minus positive numbers are negative The zero-negative negative number is positive. The two numbers of the opposite sign are added, which is equal to the subtraction of the absolute value, and the two numbers of the same number are added, which is equal to the sum of their absolute values. The zero plus positive number is equal to the positive number, and the zero plus negative number is equal to the negative number.
The narrative of the algorithm for positive and negative numbers is correct and is completely consistent with the current law. The introduction of negative numbers is one of the outstanding contributions of Chinese mathematicians. The habit of expressing positive and negative numbers with numbers of different colors has been retained until now. Negative numbers are indicated in red, and a newspaper’s economic deficit appears in a newspaper, indicating that expenditures are greater than income and financially. Negative numbers are the opposite of positive numbers. In life, we often use positive and negative numbers to represent the two opposite quantities.