When Wang Jian returned home, he first told Wang Li, who had already returned, about Bai Zhong's promotion.

"General Bai did a good job."

He was very satisfied with Bai Zhong's approach, he was old, and it was impossible to support the entire Wang family, although Wang Ben was in his prime, there would be times when he was old, and he would need Wang Li to take over the entire family in the future, even if he couldn't reach his height, he had to have some prestige in the army, and he didn't want to bury his reputation.

Wang Li was not surprised by this matter, and said: "Brother Bai has already told us about this matter, but I have a good thing to give to my eldest father, and Brother Bai gave it to me, and he said that he can give it to you." ”

"What's that?"

Wang Jian was quite curious.

Wang Li took out a piece of cloth from his body, spread it out in front of Wang Qian, and said, "This is it." ”

"It's called ...... Alchemy? ”

Wang Qian's knowledge is not bad, I have long heard that some rangers and knights have a set of special breathing and breathing methods that can regulate internal breathing, and after practice, they can not only enhance their own strength, but also prolong their life, and exclaimed: "Is this really given to you by General Bai?" ”

Wang Li affirmed: "Of course. ”

This is what he copied on the cloth last night from memory.

These methods are very precious and can not be found.

Bai Zhong could teach his grandson, and even said that he could take it back to himself, but Wang Jian couldn't recover for a while, and asked again: "You mean it really?" ”

"Really!"

Wang Li nodded solemnly.

Wang Jian asked again: "Have you ever practiced?" ”

Wang Li used his actions to prove that he had practiced, and when he saw the wooden pillars supporting the beams in the room, he used his internal qi and did not use force, but just waved his hand and pressed on it.

The moment I took it away, I saw that there was already a deep handprint on the wooden pillar.

"You haven't strained yet?"

Seeing this scene, Wang Jian asked again in surprise.

Wang Li shook his head: "If you exert force, this pillar will be directly interrupted by me, and after practicing, my facial features feel much stronger than before, and I can see at night." ”

Wang Jian felt that this was too powerful, and asked again: "In addition to giving it to you, does General Bai give it back to others?" ”

"The generals of our Iron Eagle Warriors, the generals have given a share."

"The princess has it too."

"I guess, the king must be practicing this as well."

Wang Li told everything he knew.

In other words, Mengwu and his family also have it.

Both the king and the princess are practicing.

"What did General Bai sacrifice it for?"

Wang Jian couldn't figure out the reason, so he simply didn't think about it anymore, and said: "I will try to cultivate, in the future, General Bai will be the benefactor of our Wang family, even if you are no longer under him, you must maintain a relationship with him, if there is anything you can help, you must help, you know?" ”

Wang Li nodded and said, "That's for sure, even if the eldest father doesn't say it, I know how to do it." ”

A similar situation is also playing out in Meng Wu's house.

Meng Wu said solemnly: "General Bai's great kindness, we can't repay it, no matter what position you are in in the future, don't forget to repay the favor!" ”

"A-Ong, I see!"

Meng Tian affirmed, and then taught Meng Wu how to practice this thing.

——

Bai Zhong left the main hall and did not go home immediately, but first went to Yichun Palace to take a look at Fusu.

"Teacher!"

Fusu hurriedly got up and saluted.

"Childe doesn't need to be polite!"

Bai Zhong said, seeing that there was an old man here, he also looked at himself at this time.

Fusu introduced: "This is Mr. Zhang Cang, when the teacher was away, my father asked Mr. to teach me to learn." ”

Zhang Cang?

Bai Zhong thought for a while, and quickly remembered who Zhang Cang was, the future prime minister of the Western Han Dynasty, and Han Fei and Li Si were the same door, they were all students of Xunzi, and it seemed that he was a member of the Qin State at the beginning, and later took refuge in Liu Bang, and finally became the prime minister, and he had corrected "Nine Chapters of Arithmetic", and Jia Yi was still his protégé.

It turned out to be another historical figure.

It is said that he also relies on cannibalism. Milk, come to live a long life, and live for a long time.

"I've seen the general!"

Zhang Cang got up and bowed his hand.

He is not as knowledgeable as Chun Yuyue, and he will not look down on a fierce general like Bai Zhong who only knows how to kill the enemy, and his attitude is very polite.

Bai Zhong also said, "I've seen Mr." ”

However, he thought in his heart that Zhang Cang might be useful to him in the future, this person is a university scholar, and he can correct the "Nine Chapters of Arithmetic", indicating that he has made achievements in mathematics and understands logic, which seems to be consistent with the Mo family.

Although Zhang Cangshi came out of Xunzi, Li Si also learned from Xunzi, and finally became a representative of the Legalists.

"Now get to know him first and build a good relationship."

Bai Zhong muttered in his heart, and soon smiled again: "Mr. Jiuwen's name, I can finally meet you today." ”

Zhang Cang couldn't tell whether this long-heard name was polite, but he bowed his head slightly, and said, "Childe, do you have an answer to this question?" ”

Fu Su came back to his senses, so he had to say sorry to Bai Zhong, so he returned to Zhang Cang's side to study a math problem.

The six arts of the gentleman, the number of the imperial book is the number of the book, and the number is related to mathematics.

Bai Zhong leaned over and looked at it for a while, and found that Zhang Cang had listed a mathematical problem for Fusu, which was probably as follows: "There is a pond square and a zhang today, and the center of it is born." One foot out of the water, lead the leaf to the shore, suitable for the shore. Ask the depth of the water and the length of the water. ”

This is a question of an equation, as well as the Pythagorean theorem.

Bai Zhong didn't expect that the ancients were already studying this, and he was a little surprised, maybe there was something wrong with Zhang Cangjiao's method, Fu Su pondered and meditated for a long time, but he couldn't think of an answer.

But they wrote the questions on paper, and now the paper is becoming more and more widely used, which is a great progress in civilization.

"The depth of the water is 12 feet, and the length of the leaf is 13 feet, is it correct?"

It is not difficult for Bai Zhong to answer this question.

After hearing this, Zhang Cang raised his head in surprise: "By the way, I didn't expect the general to be so good at mathematics." ”

He thought that Bai Zhong was a martial artist, but he was just asked by the king to teach the eldest son to practice martial arts.

I didn't expect Bai Zhong to have some ability.

Fusu was also surprised, but when he thought of his talent, he felt that it was normal.

"I just happened to it."

Bai Zhong said modestly.

Zhang Cang seemed to have found a confidant, and felt that he could compete with Bai Zhong, and said, "General, please look at this!" ”

On the next piece of paper, it was written: "There is a round timber today, buried in the wall, I don't know the size of the saw, one inch deep, one foot long, and the diameter of the intermittent is geometric?" ”

This is a question about circles, when Bai Zhong saw it, on the sand table next to him, he drew the approximate shape of the circle according to the requirements, and then calculated for a while, and then came up with the result, saying: "26! ”

"That's right again!"

Zhang Cang admired it very much.

He saw that Bai Zhong's calculation method was somewhat similar to his own, but the changes were more flexible than his own, so he asked, "What method does the general use?" ”

"Equation!"

As soon as Bai Zhong finished speaking, he thought that in this era, although there is a concept of equations, there should be no such word as equations, so he had to use words that he could understand in this era to explain to him.

Zhang Cang thought for a long time, and suddenly bowed down and said, "The general taught me the equation, and I am willing to worship the general as a teacher." ”

His attitude is very sincere, and he really wants to apprentice.

From Bai Zhong's calculation process just now, he could see that his skill level may be far inferior to Bai Zhong's mastery, and he is worthy of apprenticeship.