dream of red mansion

After finishing speaking, he stopped looking at him, turned around and walked back to lecture.

Jia Qing is completely dumbfounded now, isn't it what you said that ninety-nine is the multiplication formula table, where is the anger coming from?

On the other side, a person beside Liu Hong whispered to him: "These children of everyone really have the guts to tease Mr. Qian to his face..."

Liu Hong didn't know Jia Qing's family background, and he didn't care.He replied: "I don't know if it's teasing or not, but it's interesting that he can recite the nine nines upside down. Huh? It seems that there is nothing wrong with reciting the nine nines upside down..." Then he fell into deep thought.

After Qian Jingrun walked back to give the lecture, he said, "These ninety-nine are basic arithmetic formulas. Everyone just memorize them. I won't talk about this kind of problem."

Then began to explain arithmetic to everyone.Although the development of ancient arithmetic was restrained (in fact, it was not only arithmetic), generations of sages still deduced the knowledge of arithmetic to a certain level.

The arithmetic textbook used by Guozijian is "Nine Chapters of Arithmetic", which was written very early.

About half an hour later, perhaps to increase interest in learning arithmetic, Qian Jingrun said: "The chickens and rabbits are placed in the same cage. There are 42 heads and [-] legs. How many chickens and rabbits are there?"

After asking for instructions, Liu Hong stood up and replied, "Sir, the student happens to know the solution to this problem."

"Tell me."

"If there are thirteen chickens in the cage, there should be 26 feet. If there are 42 feet now, the extra sixteen feet are all rabbit feet. It can be seen that each rabbit has two feet missing, so it can be seen There must be eight rabbits and five chickens."

Qian Jingrun nodded in satisfaction and asked, "Where did you know that?"

Liu Hongdao: "Master Shandong Xuezheng once lectured on such topics with students..."

Qian Jingrun, who was smiling, suddenly caught a glimpse of a look of disdain on Jia Qing's face who had been standing for half an hour.Feeling even more dissatisfied, he interrupted Liu Hong, and said to Jia Qing: "Could it be that you have other opinions? Tell me if you have any! If you can't tell the reason, you can stand and listen to the rest of the class."

Everyone also turned their attention to Jia Qing.

Jia Qing was also dissatisfied for a long time. This person surnamed Qian seemed to have a grudge against him. He made him stand still for half an hour, and now he is pulling himself to intensify the attack... Huh, it's time for you Look at the colors.

"Mr. Qian, students have different solutions..."

Qian Jingrun frowned, suspecting that Jia Qing wanted to tease him again.This question is considered a very classic one, and in their "industry", the method mentioned by Liu Hong is the orthodox solution.Only Jia Qing can know other solutions?How old is he...

However, he still said in his professionalism: "Oh, come and listen again, if you are right, you can sit down."

In order to vent his anger, Jia Qing was not polite.He limped to the front, picked up a piece of "chalk" made of lime and water, and wrote down two equations on the nanmu board next to him, and wrote down the answer.He just wrote the unknown letters in the Chinese designation characters A and B, and then slowly walked back to his place.

Jia Qing thinks that this kind of equation is incomprehensible to others in China in this era.Sure enough, almost all the students showed blank expressions.

Qian Jingrun was also surprised and said, "You have already learned the 'Tian Yuan Law' at such a young age?"

Tianyuan method?What is that?Looking at this posture, this person surnamed Qian still knows this equation system?

Qian Jingrun calculated it carefully. Although he didn't know much about Tianyuan law, he only read related books, and he knew it. He nodded and said, "Although the form is a bit weird, there is nothing wrong with thinking about it. But if you are right' If you are interested in Tianyuanshu, you should read the book carefully, so that you won’t make such a strange appearance. Tianyuan is Tianyuan, what are you talking about? It refers to people, but you use it to refer to animals... All right, sit down!"

Seeing this, Jia Qing knew that he should underestimate the ancients again. This equation should have existed before this era, or at least the concept.

However, my goal has not been achieved, and I have not let out a breath, so how can I let it go?

So Jia Qing followed Qian Jingrun's words and said, "Mr. Qian, the students think that your subject is not difficult enough."

Qian Jingrun was surprised again, and asked involuntarily, "Is it not difficult enough?"

Liu Hong below was also taken aback when he heard the words, and then he was a little dissatisfied.He is a typical scholar of this era, and he respects teachers the most!What Jia Qing did was to save Mr. Qian's face...

Hope he's just messing around and can't say anything, huh?

Jia Qing didn't care so much, this Qian had prejudice against him for no reason, and even punished him physically, how could he be worthy of his slightly sore legs without letting out a bad breath...

Chapter 71 The Dragon Raises His Head and Takes a Spring Tour

"Students have a similar topic to ask sir."

He didn't care about other people's reactions, and continued: "Chickens, ducks and rabbits share the same cage, with a total of 78 legs. Among them, there are nine more rabbits than ducks, and twice as many ducks as chickens. Ask the chickens, ducks and rabbits how many each."

Jia Qing didn't know if Qian Jingrun would understand.This kind of question is obviously not easy to do with the method that Liu Hong said before, but as long as you master the method, it is also a very simple question.

But in any case, it is more complicated than the question he asked.If Qian Jingrun can solve it, he is going to pose a more difficult problem, and today he must save face.

It has been almost five years since I came to this world, and I have also read books for almost five years. I don’t need to worry about acting a bit evil. The word scholar can explain everything!

A classmate who was defending Qian Jingrun got up and said, "Jia Qing, you say such a weird question to make things difficult for Mr. Qian, do you still have the word "respect teacher" in your eyes? Besides, do you know how to solve it?"

Jia Qing didn't even look at him.Respect the teacher?Of course he respects the teacher!But what he respects is a teacher who respects students. Qian Jingrun fined him for standing without saying anything, and he has been listed as a teacher who does not deserve respect.

On the contrary, Qian Jingrun waved his hand indifferently, motioning him to sit down.Then he looked at Jia Qing and said, "Is this also solved with Tianyuan technique?"

Jia Qing said: "I don't know Tianyuan technique, I call it equation system."

Qian Jingrun asked in surprise, "You really know how to understand?"

After hesitating for a while, Qian Jingrun continued: "There are three elements in this question that I don't know. I don't know how to solve it for a while, so I ask classmate Jia for advice..." He made a gesture of asking for advice, and bowed slightly body.

"gentlemen……"

This time Liu Hong also stood up.

Jia Qing was also very surprised. He didn't understand that Jia Qing could have expected it, but he directly admitted and asked Jia Qing for advice, which surprised Jia Qing.Hastily withdrew from the seat, returned the salute with a deeper latitude: "Sir, the students dare not accept it."

Qian Jingrun did hesitate a little before he said it, but he was relieved as soon as he said it.Hearing this, he said: "Since ancient times, those who have reached the top are the first. If you know what I can't, so what if you accept my worship? But if you are talking nonsense, from now on you will stand in my class."

Mother Hippie, you're getting more and more of a threat, aren't you?It seems that the sword will not work...

Just as Jia Qing was about to step forward to write the answer, he turned around again.

"Why, you can't do it again? Then you can move your stool to the back, so as not to block the students behind.

Jia Qing's expression froze when he heard the words, but he still wanted to ask his own question: "Why did you punish me earlier, sir?"

Looking at the doubt in Jia Qing's eyes, Qian Jingrun doubted his own judgment, and asked, "Why do you recite ninety-nine backwards? Did someone teach you that?"

Uh, that's it... no one really taught me!When Jia Jing was teaching Jia Qing, he discovered that Jia Qing knew basic arithmetic. He thought it was taught by Yu Yuanchen, so he never thought about explaining this aspect to Jia Qing. Anyway, arithmetic is not important...

And Yu Yuanchen thought that Jia Jing was teaching Jia Qing in private, so he ignored it...

"Oh, no one taught it, no one taught it, the students thought it would be easier to memorize it this way." Jia Qing turned his head and walked to the front as he spoke.Qian Jingrun was left behind and said "nonsense!"

Afterwards, Jia Qing presented this simple ternary linear equation system in front of this era.Immediately Jia Qing discovered that other people, including Liu Hong, were completely unfamiliar with this.But Qian Jingrun, he can basically understand those equations, but he can't solve them...

After careful questioning, Jia Qing discovered that there are indeed equations in this era, but the means of solving equations are very poor, because there is no concept of unknowns, so Qian Jingrun does not know how to "eliminate elements", but only "straightforward". division"……

This is a warning to Jia Qing, don't pretend to be aggressive everywhere in the future, maybe you will be slapped in the face by an expert.

But Qian Jingrun didn't have the slightest intention to test Jia Qing any more, what a joke, this is a child prodigy, okay?With the arithmetic talent shown by him, he will definitely be able to make great achievements in the subject of arithmetic.

Qian Jingrun is going to cross Jiaqing and enter the school of arithmetic.Therefore, the following class basically became Jia Qing's private exchange meeting with him, and everyone else became decorations...