/kloc-At the beginning of the 6th century, German Wei Demei first invented the addition symbol "+"and the subtraction symbol "-".
Wei Demei is a calculating person. He spends all his time doing calculations, and he is engaged in the computing industry that accepts salary. He hired many students to write all kinds of complicated calculation forms, and assumed the tax rate calculation when the government stipulated tax collection and the interest calculation when businessmen borrowed money. So Wei Demei often considered how to simplify the calculation method at that time.
At that time, there were no ready-made calculation symbols to use, and Wei Demei planned while calculating at work. One day, he said to himself, "adding a prison on the horizontal line can mean an increase." +',just call it a plus sign! "Removing a company from the plus sign means reducing it. Ok,' one', let's call it a minus sign! "These two computational symbols were born.
159 1 year, Pierre de France wrote a book about algebra, in which he used the symbols "+"and "-"for the first time to add and subtract. It is said that before Bierta, people used "+"and "-"to indicate addition and subtraction. However, there is no accurate written record today, so the credit for truly popularizing the symbols "+"and "-"is still due.
"One" appeared later than "+"and "-",which was created by British scholar Lake in16th century.
The Lakers are an excellent calculator. He once tried to compete with his new abacus. In addition to mathematics, his medical skills are also quite excellent, and he was once a court physician in Britain.
When studying mathematics, Lake often encounters the situation that two numbers are equal and cannot be labeled, so he decides to create a symbol by himself. After comparing many figures and symbols, Lake felt that "there is nothing more similar in the world than two parallel and equal straight lines". Therefore, he used two parallel lines to represent two equal numbers and named them "equal signs".
/kloc-Around the middle of the 0/7th century, the British mathematician Ou Derong invented the multiplication symbol "X".
It is said that Audley was so poor that he didn't even have the money to light a lamp at night, so he had to study in the moonlight. This is how he became an excellent mathematician. The diligent Audrey found that multiplication also means increase, but it is different from addition. What shall we do? He flexibly wrote the plus sign obliquely, and used it to represent another operation method of number increase, and named it "multiplication sign".
In addition to the multiplication symbol "X", Audrey also invented the original proportional symbol, which is not much different from the current proportional symbol ":". At that time, people used to think in proportion, so mathematicians made a lot of efforts in proportion symbols. The scale symbol used by Audrey is the combination of the symbol "."and the symbol "::",and its representation method is very complicated.
Later, German Valov combined the symbols ":"and "=" to write a proportional formula, which has been widely used and continues to this day.
/kloc-At the end of 0/7th century, the Swiss scholar Hannah invented and used the division symbol "".
Hannah often encounters the problem of dividing an integer into several parts in accounting, but there is no symbol to express this algorithm. So, he used a horizontal line to separate the two points to represent the algorithm and named it "division". However, Hana's fame is not very great, which limits the application of his invention.
Later, the famous British mathematician Bayer used the division symbol invented by Hannah in his book. Since then, the division symbol has been widely used.
In this way, by the end of 17 and the beginning of 18, people used exactly the same calculation symbols as they do now.