The third book is Basic Mathematics, which contains solutions ranging from addition, subtraction, multiplication, and division to binary equations, as well as some simple geometric knowledge.

According to the standards of the previous life, it is the level of the curriculum from kindergarten to the first year of junior high school.

In this book, he introduced many mathematical symbols, such as Arabic numerals, addition, subtraction, multiplication and division, and the use of phonetic letters as unknowns.

Arabic numerals were invented by the ancient Indians and first appeared in the third century AD. But only the first three symbols, that is, only 1.2.3, are written differently than in modern times.

It was not until the fifth or sixth centuries that there were 4 to 9, and the eighth century AD did 0 appear.

At this time, he took out these ten number symbols and it was original.

The real power of Arabic numerals lies in the fact that they can be adapted to a variety of complex calculation formulas.

For example, the most common vertical calculation method is the most convenient to use Arabic numerals.

The introduction of more numeric symbols is only one of the changes, and the core point is that through this book, he summarized the study of mathematics in ancient China and made it more systematic.

This math book was also his next textbook.

The fourth part is Gewu, which is a hodgepodge of science knowledge such as biology, chemistry, and physics, similar to the nature class of primary school, but for the enlightenment of people on the island.

He has not yet written a more systematic science textbook.

Time is too short, and being able to accomplish this is already the result of using all his spare time.

And he has graduated for so many years, although he is engaged in the smelting industry and science, most of what he learned in school has been forgotten.

The only things that can be recalled are some relatively basic things and techniques related to work.

However, he believes that the problem is not big, because there has never been a shortage of science talents in ancient China, what is lacking is the attention of the state and society, and it has never been able to complete the systematization of science knowledge.

He will gradually improve the status of technical talents and complete the science system.

Of course, traditional culture also has to be learned, such as the Tao Te Ching, the Analects, Xunzi and the like cannot be put down.

However, in the enlightenment stage, only some of the more simple and easy-to-understand passages will be excerpted for learning, such as friends coming from afar.

These children who are too complicated can't understand it, and there is no point in rote memorization, so it is better to spend more time learning something practical.

After picking up these four books and flipping them roughly, he called Daniel Zhang over: "Send them to the printing shop and print a thousand sets each." ”

The first person who came to find Gu Yi was Shui Liu, and her daughter Xiao Duo was actually only two or three months younger than Xiao Li, and she was already half a year old at this time.

has been at home with a child for half a year, although she can help Chai Ben with advice, but after all, it is not as comfortable as doing things by herself, and she is about to grow hair when she is idle at home.

I heard that Wen Yi wanted to use her to establish a girls' school, so she was naturally 10,000 willing.

She also called all the sisters who were engaged in literacy education in Langhu and vowed to do a good job in the girls' school.

But at this time, there was a problem, what Wenyi wanted to do was that every village had a school, and the villages and towns close to Mengqi City could be said to go out early and return late.

If you are far away, you have no choice but to live locally.

Men can say that they can find a place to live at random, and women will be in trouble.

And many women already have children, what should I do if the children are gone?

In the end, everyone discussed and simply set up a mom-and-pop shop.

Both husband and wife went to work in the same village, and built a small courtyard for them in that village to live in, and they went to teach during the day and came back at night to live.

When they wanted to go back to their homes in the city on weekends, they sent ox carts and horse-drawn carts to pick them up.

With a special girls' school and a female husband, those stubborn parents have no excuse but to send their children to study in the academy.

Unlike boys' schools, girls' schools will set aside time to teach girls red, cook and other household chores.

This is determined by the level of productivity, and Wenyi has no way to change it.

The school's affairs have just been dealt with, and the doctors from Jin'an County Hospital are also in place, but most of them can only see some common diseases and take medicine according to prescriptions.

When encountering incurable diseases, they can only be sent to Mengqicheng for treatment.

The conditions are limited, and this can only be done for the time being.

This incident also reminded him that doctor training is a long-term work, and it will take at least several years to train a qualified doctor, and it is necessary to start preparing in advance.

So some half-grown teenagers were sent to the hospital in Jin'an County to learn medical skills.

After the doctor's affairs were taken care of, news came from the printing shop that the textbooks had been printed, and it happened that Gu Yi had also sent the first batch of fifty students.

Wenyi also bid farewell to his leisurely life and became busy.

I had a meeting with Xue Dayuan and others every morning, teaching in the morning, handling government affairs at noon, continuing to teach in the afternoon, and going home to accompany my wife and children in the evening.

Occasionally, I would go to various construction sites to check the progress, and regularly go to the barracks to meet with the soldiers.

This continued until May, when Jin Rushan returned with the caravan.

Not only did he come back by himself, but he also brought back several boatloads of scarce things in the Tang Kingdom.

"The goods brought over this time were sold for a total of 12,000 taels of gold."

Even if they know that they can make a lot of money this time, many people can't help but exclaim when they really hear this number.

Wen Yi, Xie Daoyun, Xue Dayuan and others are relatively calm, they have all been to warehouses full of glass, and this amount of money is nothing compared to it.

Seeing their calm appearance, Jin Rushan was a little disappointed in his heart, and continued: "The people of Baekje paid four thousand taels of gold, and the rest was deducted with goods. ”

"Two boatloads of cows and sheepskins...... A boatload of medicinal herbs, but Baekje is also short of medicine, so you can only buy so much for the time being, and there is also a boatload of ......"

Everything is first in the treasury of the Ministry of Households, and then distributed out.

For example, medicinal materials were transferred to the health and medical superintendents, cowhides were given to the Ministry of War to make armor and other military items, and sheepskins were given to the Ministry of Industry for nitration, and then made into clothes and bedding.

The temperature in the south can be about 10 degrees in winter, and it is almost the same to wear a sweater and a jacket in modern times, at most a thin down jacket.

The problem is that there were no sweaters and no down jackets in ancient times, and cotton was only introduced to Xinjiang and Yunnan in China, and it will take hundreds of years before it is introduced to the mainland.

Therefore, everyone has no cotton clothes to wear, and leather clothes have become the best tool for warmth.

The poor could not afford to wear leather clothes, so they had to find kapok to fill their clothes, and if there was no kapok, they used rags and velvet......

It's easy to solve without cotton clothes, but it's a big deal to go out in the sun during the day and do more work to get hot.

The lack of quilts is the big problem, and the indoor environment in the southern winter can only be said to know who lives, and the magic attack is not in vain.

How did the people survive the cold nights? Sleep in a grass nest...... Just think about it.

These skins can be made into winter clothes or bedding, and when the time comes, they can be sold to the people cheaper. It can not only reap a wave of faithfulness, but also gather the surplus grain in the hands of the people.

So the Tang Kingdom needs skins, or a lot of them.

After listening to this, Chai Ben said with some disappointment: "It would be nice if I could change some war horses to come back." ”

Jin Rushan replied: "Chai Shumi doesn't need to worry, this is just the first transaction, and the war horses will be exchanged in the future." ”

Chai Ben said: "That's good." ”

At this time, Jin Rushan reported another matter: "The people of Baekje want to buy grain from us, and I don't dare to make decisions about this matter, so I came back to ask the lord of the country."