dream of red mansion

Chapter 71 Equations and Tianyuan Technique

This Mr. Qian is actually the lecturer who suggested that Jia Qing be placed in the Ding class, named Qian Jingrun.

After everyone saluted and sat down.He looked around, and found that there was a half-grown boy in the empty seat, with an almost imperceptible smile on his lips.

finally come.

He asked Jia Qing's name on the first day of class, and was very angry when he learned that he didn't come.For this reason, he also went to Lin Zhongyi specifically to ask Jia Qing to be punished.

Dare to skip class on the first day?That's great!
But Lin Zhongyi only told him that Jia Qing had to ask for leave for something, but he didn't say the details, so he still didn't know about Jia Qing's kidnapping.

Although he heard about the movement that day, he didn't know what it was, and he didn't care.

"Last time I told you about the origin of arithmetic and why we should learn arithmetic. Today we will start to really learn arithmetic.

Almost half of you have just entered the Imperial College this year. I know very well that ordinary private schools, even prefectural schools and state schools do not offer arithmetic as a subject.So I would like to ask everyone, how many of you can't recite Jiujiu? "

Seeing that no one responded, Qian Jingrun continued: "Don't worry, it's normal. It's okay to say it. You can just go down and memorize it later."

Only then did a few people raise their hands slowly.

Qian Jingrun saw that there was no Jia Qing!I thought to myself, could it be that this Gongmen mansion actually enlightened his own children?

Telling everyone to put their hands down, Qian Jingrun said, "Very good, less than I expected. Then who of you is willing to recite it for everyone?"

Those who are familiar with it are unwilling to memorize this pediatric stuff, those who are not familiar with it are afraid of making mistakes and making jokes, and those who don’t know it don’t need to talk about it.

No one answered.

"Jia Qing, come and recite it for everyone!"

When Jia Qing heard this, he was instantly stunned.He doesn't know what ninety-nine is at all, but he does know the multiplication table of ninety-nine.So he said, "Excuse me, Mr. Qian, are you talking about the nine-nine multiplication table?"

Qian Jingrun was taken aback for a moment, ninety-nine is the ninety-nine multiplication table, of course he knew.Jiujiu originated in the pre-Qin period and has had many names.But today's people call it Jiujiu, because the beginning of the formula is the word Jiujiu.Since Jia Qing knows the ninety-nine multiplication table, he should know ninety-nine.Jia Qing's question made him suspect that Jia Qing was teasing him.

"Well, come back and listen."

It is confirmed that ninety-nine is the multiplication formula, how can Jia Qing not know it?Opened the mouth and said:

"One gets one,

One two gets two,
One three makes three,
......"

Gradually, I realized something was wrong. Why did Mr. Qian's face turn black?
"Sir, isn't it?"

Looking at Jia Qing's innocent face, Qian Jingrun was really annoyed.He said in a cold voice, "Unbearable stubbornness! Stand up for me and reflect on myself!"

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...

　I originally thought that the ancients didn't understand any equations, but who would have known to verify it...

　　
　
(End of this chapter)