It's another evening.

After school, Fei Chun was sent to the cafeteria to wait for dinner, and Pang Chunlai went to the thatched house with a stomach.

Fei Yuanjian stayed in the classroom stupidly, fidgeting, as if suffering from ADHD. He didn't want to make up classes every day, but except for Zhao Han and a few others, the other classmates didn't play with him, and even laughed at him when they saw it.

Is it so difficult to sit well with students?

Fei Ruhe's situation is similar, flipping through the "Algorithm Unification Sect" in his hand, his thoughts have drifted out of the sky, and the hellish arithmetic is more difficult than the four books.

Finally, Fei Ruhe couldn't help but say: "Mr., I haven't returned for a long time, I must have a stomach, I don't think I need to learn arithmetic today." ”

"yes, yes, you don't have to learn anymore." Fei Yuanjian hurriedly agreed, he was here to make friends, not to study hard together. With his knowledge base, if he really wants to work hard, he must first go back to the Mongolian Museum to retake children's books.

Xu Ying didn't dare to speak, although she was not so scared, she was still estranged from the rich young master.

Zhao Han smiled: "Then you go to the bamboo forest to practice martial arts." ”

Fei Ruhe, who had already stood up, sat down again when he heard the words, and said with a smile: "If you don't go, then I'll stay." ”

Fei Ruhe is also a thief, and he also has a share in posting big-character posters, so he doesn't dare to get along with Fei Yuanjian alone.

"Haha, then I'll stay and study too." Fei Yuanjian echoed and smirked. He has nowhere to go at all, he has offended too many classmates before, and he is easy to be beaten by the group once he is alone.

Fei Chun ran back and forth a few times, and finally brought everyone's food.

After a while, Pang Chunlai also returned to the classroom, picked up chopsticks and said, "Learn while eating." This method of arithmetic is more practical than the study of scriptures. In the future, whether you are a magistrate, or marching to war, or managing your family's business, you will definitely be able to use arithmetic. ”

"Yes." Fei Ruhe, Fei Yuanjian and Fei Chun, the three of them frowned.

Xu Ying sat honestly, waiting hungrily to learn new knowledge.

As for Zhao Han, he was silent throughout the whole process, immersed himself in familiarizing himself with various related terms in ancient times.

For example, "long" and "wide" are often called "wide" and "from". If you don't understand this, no matter how good the math is, it's useless, and you won't even be able to understand the questions.

Another example is the unit of time, hours, moments, shifts, and points.

12 hours a day, 2 hours a day, everyone knows this.

It used to be 100 minutes a day, but Western clocks came and changed to 96 minutes a day. I heard that in Beijing, some people suggested changing it to 108 quarters, but it was a mess anyway.

In addition, there are non-ordinary time units such as seconds, mangs, and sudden.

Moreover, Zhao Han was surprised to find that there was actually a "Zhou" in ancient China, and it has been used for 2,000 years.

The weekday is 7 days, the leap week is 8 days, and during the Qin and Han dynasties, it was used to set a working day, and the court officials only worked 6 days a week. It's just that because of the trouble of converting the flat leap, it was not used much later, and it was more intuitive and convenient to take thirty days a month.

The term "week" is also used, specifically referring to the seventh day of the seventh month, and is derived from the date of marriage.

The week is approaching, that is, the wedding date is approaching.

Zhao Han was already familiar with the calculations, and then he was reluctant to learn, pestering Pang Chun to explain various units and terms.

≡⊥＝‖_×

Can you see what it means?

3622.14 (decimal places must be half a space shorter).

In fact, as long as you get used to it, it is no different from Arabic numerals, it is nothing more than a different symbolic expression.

……

Seeing that Zhao Han only paid attention to professional terms and didn't like to learn basic arithmetic, Pang Chunlai smiled and shot a question: "Zhao Han, can you figure it out?" ”

It's really Zhao Han's progress is too fast, and he obviously shows his disgust with school, so he has to make his debut to crack it!

Xu Ying, Fei Ruhe, Fei Yuanjian and Fei Chun, the four of them read the topic curiously, and then collectively looked dumbfounded.

The content of the question is roughly as follows: "There are only 280,000 stone of military rations left at the front, and 7,000 stone are consumed every day. If you transport food supplies, you can reach it in 25 days, and consume 1,000 stone per day on the way. How much food needs to be transported to keep the front-line soldiers holding out for 90 days? ”

Xu Ying thought carefully about the method of solving the problem, and his mind was a mess, he had just begun to learn multiplication.

Fei Ruhe couldn't help but say, "Sir, aren't you making things difficult?" ”

"I didn't let you solve the problem," Pang Chunlai looked at Zhao Han with a smile, "If you can't solve it, you will be honest and practical in the future!" ”

Zhao Han did not answer the question immediately, but asked: "After the grain transportation team completes the military order, will it stay on the battlefield and wait for 90 days, or will it return the same way immediately?" In other words, after the rations are transported, they don't care whether the food team lives or dies. The question of the gentleman is vague and there are three different answers. ”

Pang Chunlai laughed: "Thoughtful thinking, it's really rare, you can figure out all the three solutions." ”

Zhao Han took the draft paper, set the number of grains to X, and then began to list the equations.

One-dimensional equations, elementary school problems only.

Three quick answers were thrown out.

All the schoolchildren were suddenly shocked, whether they were good students or bad students, they all looked at Zhao Han with admiration.

Pang Chunlai snatched Zhao Han's calculation draft, and a string of mysterious codes made him dizzy, and modern equations were heavenly books for him.

"What Chinese character is this?" Pang Chunlai said confusedly.

Zhao Han asked tentatively: "Sir, do you know Xu Guangqi?" ”

Pang Chunlai nodded and said: "Xu Guangqi, although he has never seen him as a teacher, and he doesn't even know his name, he has also heard of his name for a long time. After the defeat of Salhu, he was ordered to train a new army in Tongzhou. Now that the new emperor has ascended the throne, according to the imperial court report, he has been reinstated as a Qing military envoy. ”

Qing army is to check the situation of the army, including generals, soldiers, training, food, ordnance, and so on.

Xu Guangqi's current position is to be ordered to clean up the Ming army.

Since Pang Chun said that he hadn't seen it, then Zhao Han could talk nonsense casually.

Zhao Han didn't blink his eyes, and opened his mouth to come: "There is a missionary in the West, named Matteo Ricci, who came to Daming with the "Geometric Original". Xu Guangqi translated this book, and my father had the honor to read it before his death, and these figures came from the West. ”

"Tell me about it." Pang Chunlai was immediately interested, he asked the schoolchildren to eat and do problems, and he asked for Western arithmetic.

Zhao Han wrote out Arabic numerals, and then wrote various operation symbols, and marked Chinese characters one by one under them.

Pang Chunlai did not have a good impression of Arabic numerals, but he was surprised by the convenience of Western symbols. However, if you want to introduce those operation symbols, you have to use Arabic numerals.

It is not possible to express the arithmetic chip, because the "4" in the arithmetic chip looks exactly the same as the multiplier sign, and the "2" looks similar to the equal sign.

Pang Chunlai could only forcibly compare the two characters, and then look at Zhao Han's equation.

"This Tianyuan Technique is also!" Pang Chunlai slammed the table.

Xu Ying and San Fei, holding chopsticks in their hands, looked at them stupidly, they didn't understand stupidity at all.

Tian Yuan Shu is the equation.

Pang Chunlai said again: "You are Taixi's Tianyuan technique, only one yuan is listed, can you solve two yuan, three yuan, and four yuan?" ”

Zhao Han asked curiously: "Can Mr. use the calculation chip to solve the four yuan?" ”

Pang Chunlai shook his head and said, "Someone will, but I won't." It is reported that Zhu Shijie, a master of arithmetic in the Yuan Dynasty, once created a quaternary solution. But I have only read his "Enlightenment of Arithmetic", and I have not had the opportunity to see his book "Four Yuan Jade Jian". Don't say so much, I'll come up with a problem, and you can solve it with Taixi's Tianyuan technique. ”

Soon, a question came out.

Zhao Han solved the binary equation and handed the solution to the problem: "Sir, please take a look." ”

Pang Chunlai was not familiar with Arabic numerals, so he could only compare them and slowly check them, and then clapped his hands and praised: "Wonderful, wonderful!" ”

Solving binary equations with arithmetic is actually very fast, and the efficiency is not inferior to column equations.

However, the process of solving the problem of the arithmetic Tianyuan is more cumbersome to express on paper, and it is far less simple than the equation.

If it's a binary quadratic problem, the Tianyuan technique is even more cumbersome!

Pang Chunlai laughed: "This technique is ingenious, and I came to teach him as a teacher." ”

Students teach teachers?

Xu Ying and Sanfei were even more stunned, feeling that Zhao Han was really powerful!

Pang Chunlai said to the four of them, "You also learn together." ”

Since then, their arithmetic learning speed has doubled compared to before, and even Fei Yuanjian feels more relaxed.

After all, none of them are stupid.

Fei Yuanjian's relationship with everyone has always been very delicate.

Every day, like sticky candy, they read books, practice martial arts, and learn arithmetic together. Xu Ying quickly accepted him, but the others had a pimple in their hearts, and Ruo Ruoli always had reservations.

In the blink of an eye, the winter solstice is coming.

The memorial arch has been repaired, but the approval of the imperial court has not yet come down.

This thing needs to be approved by the government at all levels, and then it will be given in the name of the emperor.

But at the end of the Ming Dynasty, basically just give money.

The slow ones are looking for the county, and the fast ones are looking for the patrol to press the imperial history. After sending it to the imperial court, the emperor didn't care about it at all, and the cabinet directly threw it to the Ministry of Rites, and the officials of the Ministry of Rites could approve it with money.

The archway of chastity is also exclusive to the rich!

Because the imperial court only allocated 30 taels, it was not enough to set up the archway, and it took more money to make dots up and down. The people who have no money and no status, unless the magistrate is for political achievements, no matter how honest the martyrs are, they can't afford to set up the archway.

Ritual cannibalism?

I'm sorry, but if you don't have money at home, you won't even be eligible to be eaten.

(Ask for a commuter pass, a recommended ticket.) Friends who read books on the Internet, this book is the first release, you can download the "starting point APP" to come and work together. ）