"Chong'er, come here..."

Guo Jia waved to Cao Chong, and Cao Chong ran over obediently.

Guo Jia touched Cao Chong's head with appreciation. Compared to Cao Zhi, Cao Chong is indeed better. Speaking of being smart, Cao Chong is definitely not worse than Cao Zhi, and even more so. He is obedient, sensible, well-behaved, smart, and beautiful and very cute. To describe it in a modern saying - so cute, he must be a boy.

What a pity, Cao Chong is a cute little boy. If he is a little loli, that would be great, cough cough.

In short, because of Cao Xi, Cao Chong often likes to run to the Guo Mansion since he was a child. It can be regarded as Guo Jia's growing up little by little, which is definitely familiar. Among Cao **'s many sons, Cao Chong is definitely the one who is closest to Guo Jia, and Guo Jia also likes this little Cao Chong the most. You should know that whether Cao Pi or Cao Zhi, they are all big men who inherit their fathers. Only Cao Chong, who is still young and obedient, can make Guo Jia feel more at ease, at least they have no "crime" in history, right?

Since Cao Zhi has passed away, it is better to train Cao Chong well since childhood. After all, he can be considered himself. Moreover, he is young and has a strong surname. If Cao Chong can be trained to become a surname like Zhao Yun and respect his teachers, then Guo Jia will definitely feel at ease in the future.

Cao Chong looked up at Guo Jia, his delicate face flushed, and he looked cute. For a moment, Guo Jia almost fell into the rumor at the beginning. Damn, there is really little difference between the beautiful little boy and the beautiful little loli.

But immediately, Guo Jia was instantly pulled back to reality.

"Master!" Xiao Zheng Tai Cao Chong shouted crisply.

The sound is nice and the content is normal, but it sounds a bit weird to Guo Jia.

Chong'er? Master?

What a familiar word. When you hear this title, people usually subconsciously think of something? That's right! Linghu Chong and his master Yue Buqun! What a good guy, Yue Buqun finally practiced the evil-repelling sword technique. If you castrate yourself, you'll be a bit unlucky.

So Guo Jia hurriedly said,

"You won't call me Chong'er in the future."

"Ah?" Cao Chong was stunned. This name could not be changed at any time. Moreover, even if Guo Jia is his Cao Chong's master, you cannot change this name.

Guo Jia also realized that his words were wrong and said,

"I mean, don't call me Master in the future."

In an instant, Xiao Zheng Tai Cao Chong's eyes turned red.

"Master, don't rush, wuwuwu~~~~~~"

Guo Jia: "%%￥#%#…￥…”

Damn! Such students can't teach them at all!

......

Guo Jia: "..."

Cao Pi: "..."

Guo Jia was sitting and drinking tea, while Cao Pi stood respectfully beside him. The two of them had been in this state for a long time. Guo Jia had not spoken, and Cao Pi had never spoken on his own initiative, and his expression of impatientness had never been revealed.

Guo Jia picked up the tea bowl, sucked it slowly, and finally put it down and said,

"You should know that I have seen many of your brothers these days."

"Students know." Cao Pi replied, and then kept silent and didn't say anything more. Speaking of it, it was really similar to Sima Yi's style.

"To be honest, according to my observations these days, among you brothers, the person I am most optimistic about is you, Cao Pi!" Guo Jia said directly to Cao Pi. Of course, Guo Jia's words are definitely not a lie. Although the person he was most optimistic about at the beginning was indeed not Cao Pi, after these days of "observation", he finally returned to Cao Pi.

When Cao Pi heard Guo Jia's words, he bowed and said in fear.

"The teacher praised it, what kind of virtue is the student? Compared to my younger brothers, the student is really, really, too stupid." Cao Pi looked ashamed.

"It doesn't matter if you are stupid. Sometimes it's too smart, but it's not good." Guo Jia said, yes, it's like students are better than teachers, so they're even more teaching! Of course, a truly competent teacher must hope that students are smart and hope that students can be better than their ancestors, but Guo Jia is definitely not such a great guy. They are so funny? What I hate the most is the kind of students who ask the teacher with difficult questions. Moreover, the most annoying thing is the kind of bastard who knows how to do it themselves, but they still have to deliberately ask the teacher with difficult questions! That's right, you, Cao Zhi, don't look around and stand at the door!

"Since ancient times, we have been orderly in our old age. Some things are enough to cultivate moral character, study diligently, work tirelessly at night, and not violate the moral principles of being a son of man, that is enough." Guo Jia said.

"Students understand, I hope the teacher will give me more advice." Cao Pi replied immediately.

"Well, true talents are often all-round talents, and all disciplines are slightly involved. Today, I will first have a simple Pythagorean theorem. I don't know if you have heard of it." Guo Jia said. Although he is a liberal arts student, in front of these people, Guo Jia can only show off his science knowledge, just like fooling Liu Ye back then.

"Go three levers, four levers, five strings?" Cao Pi asked. Such things were recorded in the calculation book "Zhoufeng Jing" in the Western Han Dynasty, and Cao Pi also heard of them.

Guo Jia nodded, quite a bit of knowledge.

"Then do you know why it is the hook three-strand four-strand five?"

"Students don't know." Cao Pi replied, "Knowing what you know is what you don't know. It's because of what you don't know. Cao Pi at least won't pretend to understand."

Nonsense, if Cao Pi knew, it would be a god. Although it cannot be said that no one in the world knew about it, those who could know could definitely be called a mathematician of this era. Could Cao Pi be a mathematician? Only he is Guo Jia, a mathematician physicist, chemist, biologist, etc., should he be a collection of mathematicians, physicists, chemists, biologists, etc., gather the strengths of many schools! Besides, if Cao Pi even knew this, what else would Guo Jia teach?

"The reason why three-strand four-strand five is because the square of three plus four-square is exactly equal to the square of five." Guo Jia explained proudly.

"The students don't understand this very much." Cao Pi said with a frown.

"Oh, the square of three is three times three, the square of four is four times four, and the square of five is five times five." Guo Jia quickly added a concept.

"The students don't understand this very much." Cao Pi said with a frown.

Guo Jia's eyelids twitched, OK, the ancients' mathematical ability is indeed not satisfactory, so he said it again,

"Three times three equals nine, four times four equals sixteen, five times five equals twenty-five. And nine plus sixteen is exactly twenty-five."

"This, student..." As soon as Cao Pi spoke this time, Guo Jia immediately gritted his teeth and interrupted.

"Three times three means three together, three plus three plus three; four times four means four plus four plus four, and so on."

"The students still don't understand this very much." Cao Pi said weakly.
Chapter completed!