The French mathematician Xu Kai used some writing symbols in his "Three Pieces of Arithmetic" written in 1484, such as D for addition and M for subtraction.
These two symbols first appeared in "The German mathematician Wiedemann wrote " In "Business Speed Algorithm", he used "+" to express excess and "─" to express insufficient.
By 1514, Heck of the Netherlands used "+" for addition and "─" for subtraction for the first time.
In 1544, German mathematician Stiefel formally used "+" and "-" to represent addition and subtraction in "Integer Arithmetic", and these two symbols were gradually recognized as real arithmetic symbols and were widely used. The symbol "*" represents multiplication by British mathematicians Originally invented by Ottred. He introduced this notation in his "Key to Mathematics" published in 1631.

It is said to be derived from the addition symbol +, because the multiplication operation is developed for the continuous addition operation of the same number Later, Leibniz thought that "*" was easily confused with "X", and suggested using "·" to represent the multiplication sign, so that "·" was also recognized. The division symbol "÷" was originally used by Wallis in England It was later popularized in the UK.

The original meaning of the division is to divide, and the horizontal line in the middle of the symbol "÷" separates the upper and lower parts, which vividly represents "divided". So far, the four operation symbols are complete, and at that time they were still It is far from being popularized by various countries.

2. Who invented the basic addition and subtraction of mathematics Operation symbols do not appear immediately as operations occur.
For example, in China, at least in the Shang Dynasty (about 3,000 years ago), there were already addition and subtraction operations, but like other ancient civilizations such as Egypt, Greece, and India, there was no addition symbol. Writing two numbers together means adding. .

This relic can still be seen in fractional writing today.

By the third century AD, the minus sign "↑" appeared in Greece, but there was still no addition sign. In the sixth century AD, the use of abbreviations for words as symbols appeared in India. Subtraction is represented by drawing a dot on the subtrahend.
Later Europeans followed India's practice.

For example, the Latin alphabet P (the first letter of Plus, which means addition) is used to indicate addition, and M (the first letter of Minus, which means subtraction) is used to indicate subtraction.

"+" and "-" appeared in the Middle Ages. It is said that after the wine was sold, the wine merchants used horizontal lines to mark the wine in the barrels, and when the wine in the barrels increased, they used vertical lines to cross out the original horizontal lines. So there is a "-" for decrease and a "+" for the increase.

In 1489, the German mathematician Widman (Widman, 1460—?) first used "+" and "-" in his writings to represent surplus and deficiency, and in 1514 the Dutch mathematician Hoecke used it as an algebra calculating signs. Later, after the propaganda and advocacy of French mathematician Vieta (Vieta, 1540-1603), it began to popularize, and it was not recognized by everyone until 1630. I hope it will help you