"Mathematics? What's that? ”

After listening to Li Huan's report, Li Shimin was stunned for a moment.

"This ......"

Li Jian hesitated, shook his head and said, "The minister doesn't understand very well, but looking at the news that has been transmitted, it should be similar to arithmetic." Because when the king was teaching those students...... When he teaches his students, he calls it class...... No one else was allowed to be present during the lesson, so they could only learn a little from the mouths of the students. ”

After listening to Li Huan's answer, Li Shimin raised his eyebrows and said in surprise: "Arithmetic? Yuan Jia still understands this? I thought he only liked to read, and he usually just wrote and painted. ”

"Back to Your Majesty, there are a lot of scriptures in the collection of King Yu."

Facing the emperor's puzzled eyes, Li Jian nodded and said, "I heard that there are also a lot of arithmetic books from Tianzhu, Dashi, and even the extreme west!" King Yu once said that he had studied these arithmetic and our arithmetic scriptures that flowed into my Tang Dynasty from outside, and then sorted out a set of ...... Well, a set of mathematical methods, it is easy and convenient to use......"

"What? Monkey business! ”

When Li Jian said this, Li Shimin's eyebrows suddenly rose and he scolded angrily!

“……”

Hearing the emperor's angry rebuke, Li Jian immediately closed his mouth tightly, and then lowered his head.

However, he who is familiar with Li Shimin knows in his heart that although the emperor's tone seems to be reprimanding King Yu, it doesn't seem like he is really angry, and the use of the word "nonsense" also makes Li Jian a little surprised.

The emperor rarely had such an attitude towards his younger brothers.

In fact, Li Shimin really didn't get angry, after all, the six arts of a gentleman, one of the ways should have been learned, but most people must not have learned it well. As for Li Yuanjia forcing the two officials of the palace to teach those family children, insulting Sven, in his opinion, it is even more worthless!

But Li Yuanjia sorted out a set of so-called mathematical methods by himself, and the emperor was a little unaccustomed to it.

The profound knowledge of arithmetic can actually be pondered by a teenage child? Not to mention boasting about Haikou, saying that he has sorted out a set of methods by himself, which is easier and more convenient to use.

Blind toss!

However, after scolding for a while, Li Shimin's face quickly returned to the calm he had just now. In fact, after figuring out that there are only five children from these families that Li Yuanjia has asked people to teach, and the reason is that no one is usually available, Li Shimin will not care about these miscellaneous things at all. After all, there is a dignified king, the history of Luzhou Thorn, and if he wants to teach a few house slaves who can read and hyphenation, it really doesn't matter.

So after waving his hand, the emperor asked casually, "Okay, don't talk about this." Li Huan, what's new in King Xu's Mansion recently? Also, he asked people to improve the art of papermaking, but did he have eyebrows? ”

“……”

If he hadn't known that the emperor seemed to be careless at this time, but in fact he must have been looking at him from the corner of his eye, Li Jian would definitely roll his eyes and pout.

As soon as the emperor opened his mouth, Li Jian knew what he meant.

Although he is responsible for keeping an eye on many princes on weekdays, under normal circumstances, as long as there is nothing special, Li Jian will definitely not bother the emperor, and Li Shimin will definitely not care about how his brothers are doing outside. However, last time, because of the incident with King Xu, Li Jian casually reported that King Yu was looking for someone to collect thousands of catties of iron, which attracted the attention of the emperor.

Naturally, the emperor said casually, and Li Jian broke his heart.

So around the end of the year, two sets of iron pots and coal stoves that were exactly the same as Xu Wangfu's were quietly sent to the capital. And when Li Huan, who saw the real thing, hurriedly came to report to the emperor, Li Shimin really forgot that he had said the sentence "Go and check, what are these iron pots and briquette stoves, and what is the use"!

However, after eating stir-fry once and experiencing the convenience of the briquette stove, the emperor's interest in King Yu suddenly increased, and Li Jian continued to pay attention to it, and pay attention to anything special when it happened......

"Back to Your Majesty, the improvement of papermaking has not been effective."

The thoughts in his mind flashed, and Li Jian immediately replied respectfully: "King Yu has spent hundreds of times on this, but the papermaking period is long and the process is complicated, and those craftsmen seem to be still groping. ”

"Hehe, how can it be so easy!"

Listening to the emperor's casual sarcastic words, Li Jian didn't dare to talk, but continued: "But this time I sent two things from Luzhou, which were also made by King Yu, one is a writing desk, which is used for reading and writing; A recliner is used during rest. These two things, each and two sets, have been sent to the palace......"

……

"Alas!"

Looking at the sky with his hands in his hands, Li Yuanjia was stunned in his heart.

Not far behind him, Chunyan was holding his hands in front of his chest with a face, looking at the king standing in front of the door blankly, until Liu Mei beside him was really impatient, grabbed her arm, and dragged her out of the small courtyard......

"Alas......"

After looking up and sighing, Li Yuanjia shook his head, turned around and walked back to his study.

Sitting on the fourth "King Xu Edition" chair and looking at the blank pages on the sixth "King Xu Edition" desk, Li Yuanjia picked up the pen several times and wanted to write something, but after frowning and thinking for a long time, he put the pen back again.

"Damn, what's going to happen next?"

Li Yuanjia never thought that he would encounter such a problem, that is, after writing Arabic numerals...... Of course, now he is directly called a digital ...... And after using them for four operations, I didn't know what to write next for a while!

Four operations or something, in fact, it's really not complicated.

As a prospective elementary school student in the first and second grades...... At most, the theoretical basis for what to learn in the third grade, except for Arabic numerals, seems to already exist in this era.

Decimal? Needless to say, our ancestors were one of the first countries in the world to use the decimal system, and they were also the first countries to determine the decimal system as the standard. The common people have used it for so many years, and they have long been used to it.

Ninety-nine multiplication table? This appearance is no better than the ancestors who determined the decimal system as the standard. It's just that the ninety-nine multiplication table in this year starts from "ninety-nine-eighty-one" and ends with "two and a half and one".

……

The wisdom of the ancients, to be honest, is definitely not to be underestimated.

It's like the circumcision technique in "Nine Chapters of Arithmetic", how to calculate pi, anyway, before you see the version of this era, you let Li Yuanjia think about it for himself, it is really difficult - even the little thing in junior high school, he has already returned it to the teachers thousands of years later.

But after writing the four operations, Li Yuanjia was stumped.

Of course, it's not that he became stupid after crossing over, so he forgot all the mathematical knowledge in his previous life. It's one thing to say that as an ordinary person, how much mathematical knowledge he has mastered, but whether he can integrate these knowledge systems is another matter. For example, Li Yuanjia will definitely know all the mathematical knowledge learned in elementary school, but who still remembers which one to learn first and which one to learn later?

"I'll go, it's embarrassing!"