Yu Zai briefly talked about the expressions of addition, subtraction, multiplication and division. Addition is one stone plus one stone. Multiplication is to slap the stone into four pieces. For a larger one, six stones, on average, each stone will be divided into seven. Blocks are forty-two... Subtraction is easy to understand, but division is more difficult...
In short, after such basic explanations, the old man's eyes began to shine, and even the little heavenly master squatted down and watched intently.
Unconsciously, some people began to gather around...all watching the fun.
Yu Zai immediately wrote down a simple formula "cc=aa+bb". Of course, the expression is not expressed in letters, but in squares, circles, and triangles.
For example... Ma Ma Zai = Gu Gu + Jiao Jiao.
The old man was fascinated by what he saw. For the next period of time, some basic mathematics theories were explained. The old man found it difficult to listen, but the little heavenly master was surprisingly able to understand. This was probably due to the difference in status. Although the old man had the blood of a god, , but he will eventually grow old, and the Little Heavenly Master is a Qi practitioner with a long lifespan, and his age is locked in his youth, which allows his wisdom and thinking to always remain clear.
Regarding this, Yu Zai said that although he does not know quantum mechanics and has forgotten a lot of calculus, as an outstanding talent in a country, it is of course impossible for him not to be proficient in basic mathematics.
Right, it's still possible to solve a linear equation of two variables or something.
It's just that Yu Zai didn't expect that in this era of ancient ancestors, mathematics actually had a place to show off.
There is really nothing in the world that cannot be faked. As long as you are more knowledgeable than the other person, the other person will not know whether what you are saying is right or wrong.
More and more people gathered around, and some passers-by stopped with their carts. Some understood, some did not, and some who stayed for a long time were found by their wives.
What followed was a scolding and complaint. It was probably because they were grazing and you were chopping firewood. As a result, their sheep were full, but where was your firewood?
So someone nearby started making noises and asked Yu Zai: "Then, what's the use of proving these numbers?"
Similar words were once asked by soldiers from the Yanshui tribe in Hongzhou.
Yu Zai asked: "How high is the sky?"
The man replied: "I don't know."
Yu Zai then said: "You can use this number to measure it. However, although it can be measured, it is not of much help to your lives, but it is very useful to Earth Masters and Shan Yu. Because if you can measure the sky, you can measure the earth; if you can measure the earth, you can measure the mountains, hills, tombs, and ruins; if you can measure these, you can know the trend and direction of the mountains and rivers."
"Then, earth masters and Shanyu people can use this theorem to avoid taking the wrong path and climbing into dangerous situations. It is also of great use in your daily life!"
"Who corrected your current four-qi calendar? It was the Emperor of Heaven who released his honors. Why was the observatory in Taotang built? It was built to ensure the accuracy of the farming season."
"Your house should be built so that it is not afraid of rain. In fact, this theorem has been applied. Why can the inclined angle make the rain roll down? People all over the world think that this is a natural phenomenon, but they do not explore the reason. Of course, We don’t even have enough to eat, so who has time to take care of this!”
Yan Zai made a joke, and everyone around him laughed, and the atmosphere became much more lively.
Later, Yu Zai took out the scales. After these simple scales appeared here and understood the simple methods of use, everyone exclaimed that they were masterpieces given by God, and Yu Zai wanted to correct them. This is human wisdom.
Immediately afterwards, without taking a breath, Yuzai asked another question: "Today there are five birds and six swallows. They are gathered separately and called with a scale. The birds gathered together are heavier and the swallows are lighter. One bird is heavier than the other." If a sparrow and a swallow are placed interchangeably, their weights are the same. Five sparrows and six swallows weigh one. How much does each sparrow and swallow weigh?"
Ruanzai looked at the crowd and said again: "Listen to me, one by one makes one, two by two makes four..."
In this land, "Nine-Nine Songs" began to echo.
The sky is getting dark and the sun is setting towards the west. Hundreds of people have gathered here, talking to each other among the topics. Some people don't like mathematics, but they like to argue. Since they like to argue, they should learn... .
Yuan Zai did not expect that an onlooker would eventually turn into a large academic seminar. After seeing that it was getting late, he had to leave. Only then did everyone wake up from a dream, interact with each other one by one, and people who were strangers became familiar with each other. , become friends.
The old man thanked Yuzai and said that meeting him today really opened a new door for him!
The little Heavenly Master was also surprised. He used to think that numbers were just a pastime to pass the time, but he didn’t expect that there was such a profound heavenly principle in them!
Sure enough, all things, whether known or unknown to mortals, are all within the laws of heaven!
The old man said: "I once held the position of Beizheng, in charge of the number and range of land. I need to understand the different divisions of land in various places, so I came up with the counting method made by Li Shou to learn and study. Later, a man named Shu Hai passed by and told us about the Pythagorean Number. We thought we got something worth studying, but we didn’t expect that we were just scratching the surface here!”
Yu Zai also found it very interesting. Among the ancient ancestors, it was really rare to meet an old man who was obsessed with mathematics. But when he learned that the old man once served as Beizheng of a large tribe, Yu Zai understood.
Beizheng had to calculate a lot of miscellaneous things, including land and population, including food and goods, the amount of pottery and tools produced every day, the classification and division of trophies, etc. These all needed Beizheng to do.
Yan Zai thought for a while and took out something from his backpack. This was a tool that Chong Bo and his friends from the south had already used.
The measurement of the Great Flood Control City used many special tools!
The old man saw the "board" with many beads on it...
"This is called abacus, and the method used is like this..."
The calculation tools used by the ancients in this era were probably a combination of sticks and stones. This was the predecessor of the later "suanchi", but the calculation tools were actually just some bamboo pieces.
"The Classic of Mountains and Seas" says that Dayu asked Shuhai to measure how far the earth was, and Shuhai went out with some calculations. And calculation later derived an idiom, which is "strategizing".
After the old man got the abacus and roughly understood some calculation methods, he was very excited.
The little Celestial Master left with many questions, saying that he would visit again tomorrow, and everyone was invited by the old man to his residence. It was three self-built houses in the countryside, forming a small courtyard, with other tribal people living nearby. .
No one bothered the old man, which showed that the old man's status was not low. From the conversation, the old man told Yuzai and them that his name was "Julong".
This name is not very famous, and no one thought of it for a while.
After a day's rest, the old man originally wanted to serve them three times boiled wild boar meat, but Wen Ming removed the iron pot from his body, grabbed Gu Gu again, and put the "burning Gu Gu" under the iron pot. , just stir-fry the wild vegetables in the air.
It was at this time that Chonghua finally remembered the old man's true identity!
He almost didn't come up in one breath!
Julong... In the Central Plains, Emperor Fangxun also built a shrine for him to worship, but the official name of the sacrifice inside was "Houtu"!
Hou Tu during the Shaohao period!
