Chen Yuan was influenced by his teacher Yang Shi and specialized in water conservancy, shipbuilding, and military strategy.

To be proficient in all three, you must have a good foundation in mathematics.

Zhu Guoxiang and Zhu Ming, father and son, took out simple numbers (Arabic numerals) and threw out a bunch of four operation symbols. Chen Yuan didn't pay much attention to it at first, but after only a few minutes, he realized how useful these things were.

He already knew addition, subtraction, multiplication and division, the principle of fractions, and even knew how to open a simple square (the method of multiplication and the Tianyuan technique were not invented until the Southern Song Dynasty).

After memorizing the new numbers and symbols, Chen Yuan only took half a day to practice all the way from elementary school mathematics to junior high school mathematics. It's not that he's so genius, it's that he's already mastered it, and it's just a new way to express it.

By the next day, the principles of geometry had already been taught.

This is also something that Chen Yuan has learned a long time ago, but the method of the Zhu family's father and son is more intuitive and concise than the traditional expression.

The changes and formulas of plane geometry finally slowed down Chen Yuan's learning speed.

At lunchtime, Chen Yuan couldn't help but say: "Although arithmetic is a miscellaneous science, it is almost like the Tao, and it is of great benefit to the family and the country." ”

Zhu Ming has been digging into the library these days, trying to find the endorsement of sages for the promotion of mathematics. The first thing to read is the chronicles of the history books of the past dynasties, because miscellaneous studies are among them.

He said at this moment: "Arithmetic is not almost like the Tao, but it is a body of the Tao. The legal chronicles of the Book of Han and the Book of the Later Han Dynasty say in one word: Heaven and earth are in the first shape, and the characters are written, and the matter of the number of reeds is born. He also said: Those who count are 100 million and 100 million, so counting things is also the principle of life. "Yishu" (ancient Wenshangshu) also says: Count his fate first. ”

Chen Yuan said: "The Book of Han is the words of later historians, and it cannot be regarded as the teachings of sages. "Yishu" is enough to convince the public. ”

Although some people in the Song Dynasty suspected that the Guwen Shangshu was a forgery, it had not yet become the mainstream view.

Therefore, the words "fortune telling" can be used as an argument to promote mathematics.

These four words do not mean who to tell fortunes. "First" refers to the ancient sage king, Yao Shunyu to govern the country, must first set up arithmetic to live a hundred things, and create arithmetic to control the world's personnel. When Ban Gu also commented on the "Book of Shang", he said that "life and hundred things" means the unified law of weights and measures.

Therefore, the implementation of mathematics is not to be delayed in miscellaneous learning paths, but to retro, and to trace the road of the Holy King!

Zhu Ming continued to throw out arguments: "Confucius also said in his "Yi Chuan" that the ancients ruled by knotting ropes, and the saints of later generations changed it to a book deed, a hundred officials to govern, and all the people to observe. The knotted rope is the number of knots, and after the saint made the word, it became a number. The ancient holy kings had to use arithmetic to govern hundreds of officials and people. Are we ordinary people more powerful than sages, can we abandon arithmetic to pursue the great road and govern the country? ”

"Yes!"

Chen Yuan was easily persuaded because he was already proficient in mathematics, not to mention that he also had "Shangshu" and "Yi Chuan" as a basis.

In ancient and modern times, if you want to spread new ideas, you must use the guise of "retro".

There was the Ancient Literature Movement in the Tang Dynasty, the Six Classics in the Song Dynasty, the Retro Movement in the Ming Dynasty, and the Renaissance in Europe. They are all a group of thought pioneers, using retro to break the confinement and express new ideas through retro. This can be quickly recognized by the public, thus forming a trend of thought and being widely accepted in society.

Zhu Ming then concluded: "The Great Dao is in the book of sages, how to govern the country, Confucius said very clearly, and the "Book of Shang" also said very clearly, we must 'first set up a number of baskets'. Time is also easy, in ancient times, the country was small and the people were widowed, and the knotted rope could remember. At the time of the Three Kings, the land became larger and the people became more numerous, and numbers were needed. Now in my Great Song Dynasty, the territory is vast, the people are hundreds of millions of trillions, the previous number of baskets can no longer be carried, and more complex baskets must be used. Today's sages and Confucians, widely pay attention to the Six Classics, but no one has improved the algorithm, and our generation should work hard to make up for it! ”

This view established the rationality and necessity of improving mathematics, and it was also endorsed by Confucius and the Book of Shang.

Chen Yuan agreed with this very much, but sighed again: "It's a pity that the imperial examination has abolished the Ming Calculation Department." ”

During the reform of the imperial examination in the Song Dynasty, all subjects were merged into the Jinshi department, and the Ming arithmetic subject, which specialized in mathematics, was abolished. Now only the Ming Law Department has been restored, mainly testing the law, and incidentally taking a lost math problem.

If the imperial examination is not examined, mathematics is not prosperous.

Unless someone succeeds in the reversal and forcibly adds mathematics to the imperial examination.

After dinner, the school worker came to clean up the dishes and chopsticks, and Chen Yuan continued to do geometry exercises.

Zheng Hong came to visit: "Zhu Xianggong, Da Lang, and the ancestors of the family invited two of them to a banquet to discuss the sale of gentlemen's tea." ”

"Yes," Zhu Guoxiang asked, "when will you go to the banquet?" ”

Zheng Hong said: "It's okay for the next few days, just see which day you two are free." ”

Zhu Guoxiang said: "It's noon tomorrow." ”

"Waiting for you." Zheng Hong said happily.

Zheng Fatzi is gone, and Chen Yuan is still immersed in the questions, asking for answers from time to time.

The father and son, with their golden fingers in their bodies, have a clear memory of what they have learned. But it was inevitable that he forgot to teach a certain formula, Chen Yuan asked questions, and they made up the formula.

As far as Chen Yuan's learning speed is concerned, he can basically master plane geometry in one or two months at most, after all, he already has a relevant knowledge base.

The next morning, father and son descended the mountain together.

As soon as I walked to the gate of the academy, I saw two bamboo frames parked there.

Zhu Ming said casually: "A gentleman doesn't replace animals with people, just walk down the mountain." ”

The students of the academy who heard this all praised him as a true gentleman, and they pretended to be forced again silently.

If Zhu Ming became the emperor, he would definitely not say this again, and at most he would restrain officials not to sit in a sedan chair. Because the sedan chair belongs to the service industry, it can solve the employment problem, and govern the country regardless of whether it is a gentleman or not.

All the way to Zheng's house, the main gate was wide open.

The father and son walked in from the main entrance, and Zheng Lan took her children and grandchildren to greet them in the front yard.

The Zheng family, a big businessman, had already adopted a three-meal system, and they had not yet arrived at this time, so they invited them to rest in the garden.

The early blooming flowers have bloomed, the garden scenery is beautiful, and the snacks are also served, Zheng Lan took out the best group tea to entertain.

Zheng Lan personally added charcoal to make tea, and said: "My grandson is stubborn, I followed Da Lang before, and learned a lot of serious skills, and I thank you here." ”

Zhu Ming said with a smile: "The petty officials are smart, not dull. ”

"There is little wisdom, but there is no great wisdom," Zheng Lan patted his ass, "The two of them use the way of a gentleman to make a gentleman's tea, which is called great wisdom. ”

Zhu Guoxiang said: "Occasionally, it is just a start-up. By next year, the roasted tea skills will be more mature, and the taste of Junzi tea will definitely be better. ”

Zheng Lanxi said: "We'll see." He asked, "How many catties can be produced this year, and how much can be produced next year?" ”

Zhu Guoxiang said: "It is definitely no problem to produce a few hundred catties this year, and it is unknown how many catties there will be next year." ”

"Excellent, this old decay is relieved." Zheng Lan stroked her beard and smiled.

Modern tea mountain, the annual output of one acre, can reach two or three hundred catties, but that is thanks to the addition of science and technology.

Convert mu and jin into modern units, tea mountains in the Tang and Song dynasties, the general yield per mu is less than 150 catties, and very few can reach 180 catties. There are more than 300 acres of tea mountains in Daming Village, due to poor management, the average yield per mu is only 120 catties, all of which are used to make fried tea, and the annual output is more than 30,000 catties.

Don't look at the high price of good tea in big cities, that is the market price after layers of taxation.

The ex-factory price of the tea plantation owner is countless times lower, and the first-class tea is only sold for more than 80 wen per catty. Even if the tea leaves in Daming Village are all first-class tea, and the tea tax is not paid, it can only earn more than 2,000 yuan per year.

Of course, this is impossible, the first-class tea is only a few, most of them are second- and third-class teas, and the annual income of more than 1,000 yuan is the sky.

The tea tax can't be paid, after all, Zhu Ming is not a bandit, he must take out some of the tea leaves and go through the procedures of the tea and horse divisions like the old white staff. The government of Xixiang County is easy to bully, but the tea and horse division of Xixiang County can't ignore it, and it is very troublesome to provoke those people.

After deducting tea tax, freight and production costs, the annual net profit is estimated to be less than 1,000 guan.

This is still because the cost of roasted tea is lower, if you steam tea like Lao Bai Yuanwai, there will be two or three hundred net profits a year - Lao Bai Yuanwai can only make money by selling private tea, and if all the tea and horses are sold, 100% will lose money. Because in addition to tea interest, there is also a tea garden tax, and the tea garden tax is also charged according to the proportion of tea produced.

"Weng Weng!"

A young girl suddenly ran in, grabbed Zheng Lan's arm, and kept shaking and coquettish: "The little lady of the Min family sent someone to ask me to go to Qingdao on March 3." A-Niang won't let me go, I'm going to go, I'm going to go......"

"Okay, okay, you go, you go." Zheng Lan was full of smiles.

The girl said happily: "I still have to bring a lot of delicious food, and call the sister of the Li family too." ”

Zheng Lan nodded and said, "Call them all, let your brother accompany you, don't have any accidents." ”

The grandfather and grandson were talking there, and the father and son were also chatting privately.

Zhu Guoxiang whispered: "This little girl, do you feel like a star?" ”

Zhu Ming asked, "Like whom?" Dilireba, Gulnazar, or Malzaha? ”

"What a mess," Zhu Guoxiang said, "I mean she looks like Li Lizhen." ”

Zhu Ming looked puzzled: "Who is Li Lizhen, I have only heard of Li Shizhen." ”

Zhu Guoxiang was speechless, after all, they are two generations, and there is no common topic in this regard, so he had to popularize science: "Li Lizhen is a Hong Kong star who has made a lot of good movies. ”

"Oh," Zhu Ming seemed to be opened to memory, "I remembered, did I make a "When the Durian is Ripe"? ”

Zhu Guoxiang's face turned dark, he could already hear that his son was making fun of himself.

"Isn't it "When the Durian is Ripe"?" Zhu Ming is still pretending, "That must be "When the Cherry is Ripe", or "When the Banana is Ripe". ”

Zhu Guoxiang stopped talking.

Zhu Ming smiled evilly: "Dean Zhu, you must have seen this movie, what kind of fruit is ripe?" ”

"You can shut up!" Zhu Guoxiang glared at his son.

(End of chapter)