Three customers came to a store, eager to buy cakes to catch the train, and the limited time could not exceed 16 minutes. Several chefs said there was nothing they could do, because it took five minutes to bake two sides of a cake, and two cakes could be put in one pot at a time, so it took 20 minutes to bake three cakes. Then there was the chef Lao Li, who said that it only took 15 minutes to think. Do you know how to make a brand?
The origin of mathematics: Mathematics is the oldest subject, and its origin can be traced back to more than 10,000 years ago. However, very little information has been preserved before 1000. So far, only in ancient Egypt and Babylon have systematic mathematical documents been found.
As early as 65,438+05,000 years ago, human beings have been able to describe the images of people and animals quite realistically. This is the earliest evidence of the germination of graphic consciousness. Later, it gradually began to pursue circles and straight lines, thus becoming the earliest prototype of mathematical graphics. In daily life and production practice, counting consciousness and counting system have gradually emerged. Humans have explored a variety of counting methods, including knotting with ropes at first, counting with stones, and further expressing language points with symbols, and gradually developing into the numbers we use today. When graphic consciousness and counting consciousness develop to a certain extent, measurement consciousness appears.
This series of development and evolution has gradually formed a complete mathematical discipline that we are familiar with today, including arithmetic, geometry, algebra, trigonometry, calculus, statistics and probability (in fact, it was originally for people to study gambling) ... and so on, and it is still developing.
Arabic numerals were not invented by Arabs, but originated in ancient India, and were later mastered, improved and spread to the west by Arabs, who called them Arabic numerals. Since then, the whole world has agreed with this statement.
Arabic numerals were gradually created by ancient Indians in their production practice.
In ancient India, urban construction needed design and planning, and sacrifices needed to calculate the movements of the sun, the moon and the stars, so mathematical calculation came into being. Around 3000 BC, the number of residents in the Indus Valley was relatively advanced, and the decimal calculation method was adopted.
By the third century BC, a complete set of numbers appeared in India, but the writing in different regions was not completely consistent. Brahmanism was the most representative: this set of numbers was widely used at that time. Its characteristic is that every number from "1" to "9" has a special word. Modern numbers are derived from this set of numbers. In this set of numbers, the symbol "0" (zero) has not appeared yet. The number "0" did not appear until Gupta Dynasty (320-550 AD). The symbol "0" was used in the mathematical work "The Manual of the Sun" completed in the 4th century A.D., when it was only a solid point. Later, the dot evolved into a small circle "0". In this way, a set of numbers from "1" to "0" tends to be perfect. This is the great contribution of the ancient Indian people to world culture.
Hua (191065438+10/2-1985 June 12) is one of China's most influential mathematicians in the world. His research results were named "Fahrenheit Theorem" and "Fahrenheit Theorem" by the international mathematical community. A: Very famous person! )
then what Find a few math problems at random.
What a joke! Wait!
I came to the vegetable market and wanted to buy food. The food in the market 1.5 yuan, ready to buy 2 kg. But I looked at the food outside the market, which is 1.2 yuan, which is more delicious than the food inside. I was going to buy another catty and fry it at night, which not only bought more vegetables, but also became cheaper and cheaper.
Then, I go to buy meat. The meat on the market is lean meat, 4.5 yuan is a catty; As for the meat outside the market, the lean meat is one kilo less than that of 4.5 yuan. In contrast, I certainly choose the meat in the market. So I bought 3 Jin of meat and spent 4.5×3= 13.5 yuan.