The six-grade official strode into the Daqing Hall like a breeze, bowed slightly and said, "Minister Su Song greets Your Majesty!" ”

If you are familiar with history, you will definitely be surprised at this moment. Pen, fun, pavilion www. biquge。 info Su Song Su Zirong is the first talent in the Northern Song Dynasty, and his achievements are definitely comparable to a great writer like Su Shi, although he is not known for his articles. Su Song was an extremely intelligent and studious person in history, and he knew everything about algorithms, geographies, mountain scriptures, materia medica, exegesis, and law. According to the current words, it is a good student with all-round development of morality, intelligence, beauty, physical and labor. Historically, Su Song led the manufacture of the world's oldest astronomical clock, the "Water Transport Instrument Elephant Table", which opened a precedent for modern clock escapements. This is a very remarkable achievement in ancient times, and the wisdom of the ancients can be seen.

Historically, Su Song was admitted to the Jinshi in the second year of Qingli and was only twenty-two years old. Su Shi was also admitted to the Jinshi at about this time, but the ancient craftsmen were not known, and everyone in the world knew the three Sus, but they didn't know that there was still Su Song.

And in this different time and space, the genius is still so genius, Su Song also ascended to the Jinshi early stage, but unfortunately he is only obsessed with invention and creation, and does not meet his boss, and he disdains to invest too much energy in terms of human sophistication.

Lu Chengqi only knows a little about history, and he is not proficient in it, and he doesn't know a great craftsman like Su Song, which shows to what extent the ancients did not pay attention to craftsmen. However, this does not prevent Lu Chengqi from appreciating Su Song.

Lu Chengqi opened his mouth and said, "Since Su Qing is so confident in arithmetic, I will test you." There is a problem of chickens and rabbits in the same cage in "Sun Tzu's Sutra", and now there are chickens and rabbits in the same cage, with thirty-five heads on the top and ninety-four feet under it. How does Su Qing calculate? ”

Su Song didn't think about it, and said directly: "There are twelve rabbits, and twenty-three chickens." ”

Although Lu Chengqi knew that this problem was nothing in later generations, and it was just an equation to solve the equation, but in ancient times, this was a difficult problem for the vast majority of people. And Su Song calculated the answer without blinking his eyes, such mental arithmetic is really terrifying. However, this "Sun Tzu's Sutra" has been written for a long time, and even if Su Song reads and remembers it, it is nothing.

Lu Chengqi decided that it would be a little more difficult: "Nine hundred and ninety-nine yuan, buy one thousand pear fruits in time, nine pears for eleven yuan, and four yuan for seven fruits." Q: How much is the price of pear fruit? This is the title in the "Four Yuan Yujian" compiled by Zhu Shijie, a mathematician of the Yuan Dynasty, which is an application problem in modern terms: "Use 999 yuan to buy a total of 1,000 pears and fruits, 9 pears for 11 yuan, and 7 for fruit 4 yuan." Q: How many pears and fruits do you buy, and how much do you pay for each? ”

Lu Chengqi is sure that only he has read this book in this different time and space, and Su Song will never read a similar topic. In this way, you can test Su Song's true level.

The ancients were still a little difficult to calculate the division, but this didn't seem to be able to test Su Song. Seeing that, Su Song paced a few steps in the Daqing Palace, and came up with the answer: "Six hundred and fifty-seven pears, a total of eight hundred and three texts; Three hundred and forty-three, a total of one hundred and ninety-six texts. ”

Lu Chengqi was so excited that he almost bounced up from the dragon chair, he was the first time he had seen such a powerful ancient, and he was even more shocked than seeing Su Shi!

In fact, this is equivalent to a primary school application problem, how can it be rare to make a "water transport instrument elephant platform" of the great scientist Su Song? It's just that Lu Chengqi has never seen such a quick person in mental arithmetic, so he was naturally shocked.

Lu Chengqi finally suppressed the excitement in his heart, he knew that he had discovered a rare talent. He couldn't help but be interested, and continued to ask: "I only heard that the guests next door are divided into silver, I don't know the number of people and I don't know the silver, four taels are more than four taels, and half a catty is less than half a catty." How many guests and how much silver? "If you calculate it today, most people will feel that this question is a little wrong, because in ancient times, one catty was equal to sixteen taels, and if you use one catty and ten taels to calculate, of course, you will get a different answer.

Su Song smiled slightly and said, "It's very simple, there are three guests, and there are sixteen taels of silver." ”

Lu Chengqi is poor in questions, he remembers so many interesting problems in ancient mathematics, what should he do now? Suddenly, he caught a glimpse of a big tree outside the hall, and he came up with an idea: "Come on, go and measure the length of the shadow of the big tree outside the hall, and the angle between sunlight and the ground?" ”

The attendants looked at each other, they would measure the length, but the angle or something, how to measure it? They didn't dare to move, for fear that if they didn't do a good job, the emperor would blame them, and no one would be able to bear it.

Lu Chengqi was about to get angry, and Su Song smiled and said, "Your Majesty, it is natural that Xiao Huangmen does not know arithmetic. I'm willing to measure! ”

Lu Chengqi pondered for a while and said, "Su Qing, you can calculate the height of the big tree outside the hall according to the length of this shadow and the angle of sunlight. ”

After hearing this, Su Song turned around and walked out, turned around before the tea time, and said, "Your Majesty, the minister has an answer." ”

Lu Chengqi smiled and said, "How tall is the tree?" ”

Su Song said: "The shadow is three zhang long, and the angle is thirty, and the height of the tree is about one zhang six feet and six inches. ”

This time, Lu Chengqi was really convinced. This question uses the content of trigonometric functions, but I didn't expect Su Song to even be able to do trigonometric functions, what else does Lu Chengqi have to say?

Lu Chengqi sighed: "Su Qing is really talented, I have decided, you will be the main exam!" I'm not ashamed, and you can also come up with a good topic, and you can show it to me. ”

Su Song didn't expect that after more than ten years in officialdom, he only got the opportunity to show his strength when he was middle-aged. Examiner Chunqiu, that's a shortcut to the top of the imperial court, and anyone who changes it will be so happy that they are about to go crazy. Su Song was overjoyed, bowed down and bowed: "The minister will live up to His Majesty's trust!" ”

Lu Chengqi determined the examiner of each subject one by one, and the early dynasty dispersed. What he didn't know was that in the future, this anecdote was called arithmetic by people with good deeds, and it became a good story for a while. Out of Lu Chengqi's favor for arithmetic, the books on arithmetic on the market were sold out. Even the vigorous development of movable type printing technology cannot make up for the situation where supply exceeds demand.

Lu Chengqi learned that the world had set off an upsurge in learning arithmetic, and he was quite proud in his heart: "Mathematics is the king of science, and there were many smart people in ancient China, but unfortunately they were all used to read the Four Books and Five Classics, which is really a waste of talents!" I use it to make a profit, even if I study arithmetic, I can be an official, so as to stimulate the intelligence of these official fans......"

I don't know how many smart people there are in Chinese history, but under the general trend of official-based thinking, they are all drowned in the imperial examination. After entering the officialdom, he fell into the intrigue of self-striking, unable to extricate himself. For the study of arithmetic, it is impossible to reach it unless you are extremely interested. The style of study in the Dashun Dynasty was not as confined as in the Ming Dynasty, and it was not forbidden to learn, even in private learning, Mr. would teach students if he was interested. It's just that arithmetic is not tested in the imperial examination, and there has been no major breakthrough development.

In fact, the abacus is a thing, and the Dashun Dynasty has already appeared. Lu Chengqi plans to list the abacus as a compulsory subject when he takes the arithmetic test, after all, it is the earliest calculator, and it must be developed well, and strive to make the discovery of many theorems appear in China, even if it is in China in a different time and space.

Lu Chengqi said in his heart: "Mathematics, that's the king of science, without the assistance of mathematics, even if I can research a powerful weapon, it will only be a flash in the pan, and it can't be ...... for a long time."

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