People in Datang have been expelled from school

Chapter 263 Mathematical Olympiad
Li Zheng put a few pieces of tea leaves into the tea bowl, soaked them in hot water and floated in the water, took a sip and said, "Actually, you don't need too much tea leaves every time."

Xu Jingzong nodded with enlightenment, "I think the old generals are used to chewing peonies."

"How is the soap?"

"I made a total of 1000 yuan of soap in three days."

Following Xu Jingzong to the soap workshop, Li Zheng noticed Li Jiangshan standing on the attic of the printing workshop and staring at him when he passed the printing workshop.

Now Xu Jingzong has become the second in command of Jingyang Village, and like Li Yifu, he is in charge of the production and manufacturing in the village.

The ability of these two people to do things is good.

Regardless of their character, they are still very good second in command.

They are handy with all the miscellaneous affairs in the village.

Li Yifu is in charge of most of the workshops in the village, as well as road construction and manpower arrangements.

Xu Jingzong is more in contact with the outside world, he is very familiar with the officialdom.

Some workshops that Li Yifu has no energy or can't manage have arranged for Xu Jingzong to watch them.

Li Chunfeng has come to the village and started to teach the children here how to count.

Everything in the village is in order.

Li Chunfeng explained to the children that it was a chicken and a rabbit in the same cage.

"Chickens and rabbits share the same cage. There are [-] heads and [-] feet. How many chickens and rabbits are there in each cage?"

After finishing the question, Li Chunfeng smiled and said, "Does anyone know the answer?"

This is the subject of Sun Tzu's arithmetic.

Li Chunfeng expects that the children will scratch their heads and ask for advice.

When I calculated this topic myself, it took more than a month.

I have to sigh, the grandson's arithmetic is profound.

But the scene in front of him was a little different from what he expected.

There was silence in the classroom, and even children were sleeping.

Seeing these children's sloppy learning attitudes, the rural children may not understand, Li Chunfeng sighed, "Your county lord asked me to teach you numeracy, the way of numerology is broad and profound, even if a poor Taoist has learned it all his life It's not over yet."

Daniel said, "Daozhang Li, can you come up with some more difficult questions?"

"Difficult...more difficult." Li Chunfeng looked at the topic he had written with charcoal on the wooden board in surprise.

Daniel, who is the class monitor, said again: "This question is too simple, we all know how to do it."

"Simple……"

Li Chunfeng looked at his own question, and then at the students who were working on it.

The question of chickens and rabbits in the same cage has stumped many Chang'an students, even the students of the Imperial College may not be able to answer it.

Li Chunfeng said: "Okay, what is the answer to this question?"

Daniel said, "There are sixteen chickens and fourteen rabbits."

"Ok?"

Li Chunfeng looked at the question behind him in surprise.

I revised a few numbers in the title again, and asked again: "What about now?"

Daniel said helplessly: "33 rabbits, 26 chickens."

Li Chunfeng changed a few more numbers in surprise.

Daniel: "Twenty rabbits, twelve chickens."

Changed back and forth several times.

Daniel answered fluently.

Li Chunfeng looked at the child with a nervous expression, "How did you figure it out?"

Daniel smiled reluctantly, "Ms. Xianhou taught it."

"Then how did you count so fast?"

Li Chunfeng asked again.

Li Zheng's numerology realm was very high, and Li Chunfeng thought that perhaps Li Zheng's numerology realm was even higher than his own.

Unexpectedly, Li Zheng taught Jingyang's children.

After listening to Li Chunfeng's question, Daniel replied respectfully: "Actually, the trick to this question is very simple. The teacher taught us a formula."

"Mantra? What formula?"

Li Chunfeng is nervous?Does Li Zheng have a better algorithm?Even kids can learn it?If this is the case, what is the numerology that I have been adhering to for most of my life?
The class was very quiet, and the big cow read aloud: "Suppose it's all chickens, suppose it's all rabbits. How many feet are added, how many feet are missing, and divided by the difference in feet, is the number of chickens and rabbits."

"..."

Li Chunfeng frowned and stroked his chin, pondering for a while, then said, "Recite the formula again."

Daniel read the formula again.

Frozen in place, Li Chunfeng's mind kept echoing the mantra of Daniel Nian.

It is indeed possible to calculate in this way, and it is more simple to calculate in this way.

Looking up at the students here, Li Chunfeng asked again: "Could it be that you all know it?"

"We will." The students said in unison.

A group of ten-year-old children already know how to do the questions in the grandson's arithmetic?
What kind of monster did Li Zheng teach?

There are only a handful of people in Chang'an who can figure out this problem.

There is also this formula, knowing this formula, it is really much easier to use the formula to count chickens and rabbits in the same cage.

Just apply the numbers.

A question that has stumped so many people in Chang'an has become so easy in Li Zheng's hands?

This may be that it is better to teach a man to fish than to give him a fish.

Avoiding the eyes of these children, Li Chunfeng tidied up the scrolls in front of him in a panic.

Clearing his throat, Li Chunfeng wiped the cold sweat from his brow and said, "Since you know all the skills, it will be easier for the poor, why don't you ask the poor if you have any questions you don't know how to do."

"Yes!" Daniel said immediately.

Li Chunfeng took a step back, facing the half-grown child who looked only ten years old in front of him, feeling a little flustered inexplicably.

Daniel drew a huge square on a piece of paper, and the square was composed of 49 small squares to form a seven-by-seven square.

After seeing Daniel finished painting, Li Chunfeng asked, "What kind of subject is this?"

Daniel said: "This is a topic taught to us by Mr. Xianhou. This figure is composed of 49 small squares. How to cut it so that the figure of this figure remains unchanged and just leaves one piece empty."

Li Chunfeng stared at the figure in front of him and said, "Speak more clearly."

Daniel looked at Li Chunfeng and said: "Cut out of 49 small squares, how can it become 48 small squares with the same shape."

Li Chunfeng blinked and said, "Isn't it enough to cut a piece?"

"No, there can be no less than 49 pieces, and there must be no excess paper material, but there will be one piece missing after cutting and re-splicing."

"How is it possible!" Li Chunfeng looked at the figure and said, "If you don't cut out a piece, how can you make this picture less than one piece out of thin air."

"Indeed, the students also found it difficult. The teacher reminded me that it was related to Jiugong Connection."

Jiugong connection?Naturally, Li Chunfeng had also heard of this question, and it was Li Zheng who used it to test the children of the five surnames at that time.

At first, I tried it myself. No matter how the Jiugong connection is drawn, five straight lines must be connected in one stroke.

However, Li Zheng's painting method can use four straight lines, as if reducing a painting out of thin air and connecting the nine palaces in series.

(End of this chapter)