In order to promote Arabic numerals during the Zhenguan period, Li Yuanjia really spared no effort.

And he can't be considered a lie, after all, if you want to understand the principle of the "assembly line", you really need to know some mathematical knowledge...... Of course, it can be understood with the mathematics of the ancestors, but it is not as simple as Arabic numerals, so direct.

But there are twists and turns in this, and Cheng Zhijie naturally doesn't know.

The old man just knew that King Han told him with a serious face that he must learn mathematics first, and then he could master the method that can be built quickly and at a low price, so it must be like this.

He is a prince, there is no need to deceive himself as a prince.

So after pondering for a while, the old man asked, "Then dare to ask the king, if I want to send someone here to learn this...... Math, right? If you want to learn this, what is the way? ”

While asking these words, Cheng Zhijie's eyes also narrowed.

What's the idea?

This is just a sentence on the surface, but in fact, I just want to ask people what conditions King Han wants to open.

The law should not be passed on lightly, and he understands this truth.

It is now the twelfth year of the Tang Dynasty, an era when there is no patent law, but knowledge is equally valuable.

Why are there so few people who read? Because in addition to the expensive pen, ink, paper, and inkstone, the price of books is always flying in the sky, and the cost of learning from teachers is also quite scary. Ordinary people don't think about it, even if the small rich family wants to support a scholar, they have to tighten their belts.

If you have to find a comparison, the tuition fees in ancient times should be the standard of private schools in the future, or even higher.

Reading is like this, and learning art is no exception.

Whether you want to become a blacksmith, a carpenter, a mason or a papermaker, you usually start with a master and apprentice for a few years...... In fact, it is to be a free worker, and then you can slowly learn a little real craft. Even so, the masters often have to leave one or two hands to press the bottom of the box, passing on the son but not the daughter, and the inside but not the outside......

The reality is like this, so this is also the reason why Cheng Zhijie asked tentatively.

If it was an ordinary craftsman or something, of course he didn't need to be so careful, but in front of him was the King of Han of the Tang Dynasty, who was higher than him in terms of rank and title, so Lu Guogong could only ask sincerely.

And before asking these words, he was also prepared for rejection.

It's not so easy to spend money on technology these days, especially the magical technology of Han Wang, which is even more difficult. So Cheng Zhijie asked casually while being curious, and it was not surprising that he was rejected.

However......

"Want to learn math? It's easy! ”

Glancing at Cheng Zhijie, Li Yuanjia said with a strange expression: "The Xinhua Bookstore in the East Market sells a full set of books, and the price is not too expensive, and you can buy it whenever you go." Of course, that set of books is just a foundation, but after you finish learning, you can follow my people to learn the rest of the things, and the speed is much faster! ”

When he said this, Li Yuanjia paused slightly, and then said with a smile: "Hehe, speaking of which, Li Tai has already learned the whole set of books, and he is the first to eat...... Ahem, the first person to finish math! ”

"Li Tai? King Wei? ”

Hearing Li Yuanjia's words, Cheng Zhijie's face suddenly changed.

Li Tai, the king of Wei, the emperor's second son-in-law, is also a hot figure in the court today, even what kind of mathematics did he learn? And already finished?

"Huh? Wrong! ”

As soon as his heart was shocked, Cheng Zhijie suddenly remembered the previous words, and was shocked in an instant: "Wang, you mean that those books can be bought in the bookstore?" Can you watch it? ”

"yes, it's easy."

Nodding, Li Yuanjia was quite proud in his heart.

Very simple basic math knowledge, basically the content of elementary school, junior high school seems to have a little bit? Li Yuanjia's proudest thing is that he has spent several years of hard work, and slowly polished it to the level that he can learn by self-study - maybe it is not as reasonable as the future planning textbook, but without the guidance of a teacher, it should be the most suitable for people in this era, right?

Therefore, this set of books will definitely be despised by the literati, because it is too straightforward, and the words do not have the slightest sense of beauty, but it will definitely be much easier to learn than the kind of math books written in ancient Chinese.

What people can write in one book, Li Yuanjia used six books!

"Goo-dong!"

Looking at his smug look, Cheng Zhijie subconsciously swallowed and spit, and didn't know what to say for a while.

Isn't this a loser?

You don't hide such a good thing, but you even put it in the bookstore to sell it? How much money does a set of books make? It's always been a lot of money, right? Not to mention that after people buy it, they won't copy a few copies by themselves and then sell them to others?

If he knew what this big guy was thinking, Li Yuanjia would definitely laugh out loud!

Take it and copy it?

This is really not unusual, after all, the spread of books in these years is really based on copying books, and printing is too expensive, and ordinary readers are probably really reluctant to spend money to buy it.

But those six books of mathematics, Li Yuanjia is afraid that people will copy them?

What he's afraid of is that no one will watch!

If it weren't for the fear of breaking the rules, or attracting greedy guys to take it casually, Li Yuanjia would have thought of printing 10,000 copies of him and distributing them free of charge in Chang'an City and Luoyang City.

So if someone dares to buy it and copy it, and then take it out and resell it, Li Yuanjia will not be angry, but will look up to the sky and laugh three times. As long as they can sell it, he can even secretly fund those pirates for hundreds of dollars!

Anyway, seeing that Cheng Zhijie was a little moved, Li Yuanjia hit the railway while it was hot: "Lu Guogong, if you want, I'll ask someone to send you a few sets when you go back, haha." You can find a few more people to learn from, and if you have difficulties, I can send someone to teach them a lesson and explain something...... Well, when they finish these books, I will let them teach them how to speed up the manufacturing speed of the rollover and reduce the cost, it will be much easier! ”

After a series of words came out, Li Yuanjia's attitude was quite eager.

It's just that what he doesn't know is that his eagerness scared Lu Guogong!

This King Han ......

Is it sick?

Rushing to send out his unique job, it seems that he is still very eager and happy?

To be honest, Lu Guogong was really confused at this moment.

Almost as a conditioned reflex, Cheng Zhijie's heart immediately felt uneasy, and he was a little hesitant about whether to let people come to learn.

It's not about buying and selling!

Don't think that Lu Guogong is cheap, it's really Li Yuanjia's attitude that goes against common sense. If he behaves very embarrassed, or if a lion opens his mouth, Cheng Zhijie will feel normal, but this reaction is really unexpected, which makes Cheng Zhijie, who is old and serious, a little unsteady.

"Do you mean...... What's wrong with that? ”