Interesting math tips: +? 、? -? , ? ,? The origin of
Negative sign? +? 、? -It was first used by Germans 500 years ago. It is said that the wine merchants at that time marked the wine in the barrel with a horizontal line as the wine in the barrel after selling the wine.
When adding, cross out the horizontal lines originally drawn with vertical lines. So there are signs of reduction? -? And used to indicate an increase? +? . 1489, German mathematician Weidemann first used it in his works? +? 、? -? These two symbols indicate surplus and shortage. Later, it was popularized after the propaganda and advocacy of the French mathematician Veda. It was not recognized until 1630.
More than 300 years ago, the famous British mathematician Audley first used the multiplication sign. He thinks multiplication is a special form of addition, so he takes what his predecessors invented?
45? Horn, multiply the symbols like this? There will be. ? This paper not only explains the relationship between multiplication and addition, but also explains the method of multiplication.
The division symbol was originally used as a negative sign in continental Europe. :? Besides or ratio, do people use fractional lines? -? Say than, talk about it later.
People combine the two and become it? The book of Swiss mathematician Laha was officially released? As a divisor.
Interesting mathematical knowledge: wonderful numbers 12
The number 12 has something to do with human beings and our lives. For example:
One year 12 months
12 hour a day and night
It is 12 hour for the clockwise hand to walk on the clock face.
In China and some Asian countries, there is a saying of 12 zodiac.
China has 12 symbols to indicate the order, namely: Zi, Ugly, Yin, Mao, Chen, Si, Wu, Wei, Shen, You, Xu and Hai.
The first part of the small intestine is called duodenum, and its length is equivalent to the width of my 12 finger.
There are 12 thoracic vertebrae in the human chest, which are connected with 12 pairs of ribs respectively.
When playing volleyball, there are 12 people on the court.
The English length of penalty in football match is 12 yards.
Interesting mathematical knowledge: 0 is China's earliest creation.
We know that Arabic numerals 1, 2, 3, 4, 5, 6, 7, 8, 9 were originally invented by Indians and were introduced to China in the late13rd century. People mistakenly believe that 0 was also invented by Indians. Actually, India didn't have it when it was first invented? 0? , they let it go? 204? , written? 2 4? , empty in the middle, write 2004? 2 4? How do you know how many zeros there are in the middle? To avoid confusion, just use some? To show that it was written in 2004? 2? 4? Isn't that confused with decimals? It was not released until 876 AD? 0? Make sure.