Understanding the principle and actually learning to use it are two different things.

It's like using sand to make glass, almost everyone who has been influenced by the Internet in the future knows this principle, but how many people can do it if they really do it? There is also movable type printing, and many people think that taking a few stamps together is movable type printing...... Just like Li Yuanjia demonstrated to the emperor at the beginning, but why don't they want to think about it, the ancestors invented movable type printing in the Song Dynasty, why did they use engraving printing until the nineteenth century?

Saying and doing, principle and application, are two different things.

Otherwise, in the future, there will always be shouting about the transformation of achievements, and the transformation of achievements is actually the same reason, what is researched in the laboratory needs to be used in the industry, and it takes more effort.

Fortunately, the "assembly line" for making a rollover is too simple.

You just need to know how many parts there are in the rollover, how many man-hours each part will take, how many man-hours it will take to assemble them one by one, and finally how many carpenters and how many handymen there are in total...... Simple mathematical calculations, so that Li Yuanjia does not need much experience, is enough to calculate it clearly and clearly.

How difficult can the wooden straight machinery that Chen Mu can make?

The twists and turns in this, if you can understand it just by reading six books, then Li Yuanjiake will really admire them.

What's more, Li Yuanjia also took out the orbital saw and planer according to his memory, which made the efficiency of the carpenters double all of a sudden, which is also something that anyone can learn?

So this Lu Guogong's idea is too simple.

But......

"Since you want to learn, then you have to learn it!"

Looking at Cheng Chuliang, the second son of Lu Guogong, who was obviously quite happy and was talking and laughing with his brother-in-law Fang Jun, Li Yuanjia's eyes narrowed again. And in the place where the other two couldn't see, Li Yuanjia's eyes also flashed with an emotion called happiness.

As a traverser, Li Yuanjia is most afraid not that someone will "steal" his "unique secrets", but that no one will want to learn!

For example, if someone stole the craftsmanship of the paper workshop and made better paper than Wang Pu, Li Yuanjia would definitely not be furious, and would even laugh snickering.

If Cheng Zhijie wants to learn the assembly line, then he must teach them!

Especially as a basic mathematical knowledge, Li Yuanjia teaches as much as he wants, and it is also the kind that includes teaching and does not charge tuition.

To give or not to give?

"Haha......"

Thinking about it, Li Yuanjia couldn't help but be happy - except for the demonic nephew Li Tai, this was the first time that someone came to the door to learn mathematics, and it was Lu Guogong's second son, his niece and son-in-law, how could he not be happy?

If this kid learns, he will at least be the heir of a large family in the future, right?

Anyway, Li Yuanjia is very confident in Arabic numerals and the mathematical knowledge recorded in those six books, and believes that no matter who they are, once they use it, it will not be so easy to go back to the past. It's like getting used to using a smart phone, and then letting him use a feature phone, few can go back......

"Uh, brother-in-law, what are you laughing at?"

Li Yuanjia was happy to himself, and he didn't pay attention to how weird his laughter was in the eyes of the two boys in front of him, Fang Jun couldn't help but ask.

"Huh? Oh, nothing, haha! ”

After a pause, Li Yuanjia's eyes flashed, and he simply laughed and said: "I just suddenly remembered something, which is the abacus I once told my beloved before." Recently, the carpenter in my house has just made a few that can be used, and I can give one to each of you when I get back...... With this thing, the speed of arithmetic can be several times faster than using Tianzhu numbers, especially when there are more numbers! ”

Thinking of the abacus that Chen Mu and they had just made yesterday, Li Yuanjia said casually.

Speaking of abacus, he is also unhappy.

originally thought that if he drew such a detailed abacus structure diagram, Chen Mu would naturally be able to make a handy abacus quickly, but Li Yuanjia didn't expect that because he forgot to mark the size, that kid would make him something the size of half a table - he thought that even if it was used to settle accounts, the king would have to use a big one!

When the abacus was finally made smaller, Li Yuanjia found other problems, such as the size of the abacus was not appropriate, and it was not smooth enough, and the proportion of the upper and lower columns was a little out of balance, and it was not easy to use.

After adjusting again and again, he was finally satisfied.

So after saying that he gave the two of them an abacus, Li Yuanjia couldn't help but think of what happened just now: "It's just such a simple abacus, in this era when everything has to be polished by hand a little bit, it takes so long to do it smoothly, and so much labor is wasted, not to mention more advanced assembly lines and standardization?" It's not just about telling the craftsmen what to do, it's about training them so that each of them can make parts with minimal dimensional errors! ”

With the help of Li Yuanjia, a plug-in, and Wang Pu, a veteran who has been in charge of the paper workshop for several years, didn't it take nearly a year to overturn the workshop?

Merely......

After listening to Li Yuanjia's words, Cheng Chuliang, who didn't know what the abacus was, was naturally confused, but Fang Jun looked disapproving, blinked his eyes and smiled: "No need brother-in-law, you just give him one, I don't need it here." ”

Although he is very keen on playing cards, and his sister Fang Fengzhu is also very enthusiastic about wanting to be his teacher, Fang Jun has never been interested in mathematics.

Although I occasionally read those books, what can I learn if I fish for three days and dry nets for two days?

After perceiving this, Li Yuanjia was naturally quite unhappy in his heart. It's just that although this Fang Jun is his brother-in-law, his father is Liang Guogong of the Tang Dynasty, and Li Yuanjia can't force Fang Jun to learn!

So in his heart, Li Yuanjia's eyes when he looked at his brother-in-law suddenly became a little unkind.

This look fixed on Fang Jun's face, which suddenly made his scalp tingle. This kid touched his nose, and he didn't know what Li Yuanjia's eyes meant for a while, but he didn't dare to speak.

Fortunately, he was worried about Cheng Chuliang next to him, and Li Yuanjia didn't want to reprimand his brother-in-law.

But looking at this guy is really a little angry, Li Yuanjia pondered for a while, and suddenly remembered what this kid wanted before he went to Sanyuan County a year ago, and his eyes suddenly lit up.

"Bereavement, it's better to be like this."

The corners of his mouth twitched, and Li Yuanjia said with a smile: "I remember that you didn't want a four-wheeled carriage?" That's it, you and Cheng Erlang come to learn mathematics together, and in half a year, I will test you, and whoever takes the best test will give him the best four-wheeled carriage......"