On the first day of school, until the end of class at noon, Ren Pingsheng felt that in this place, it was simply a waste of time. First, the sleepy Taoism of Mr. Lin Daoqing in the first class, followed by the mathematical arithmetic taught by a bloated fat man. As soon as he heard about mathematics and physics, Ren Pingsheng's heart perked up, good guy, this thing is very appetizing to me!

In fact, as soon as the dead fat man began to lecture, he committed public anger, and the scene got out of control for a while, but fortunately there was no accident.

The mathematics and physics teacher looked to be only in his early thirties, and his slow movement made his simple smile seem to be painted on his face, and he never changed. That's quite unsettling, just such a stunned character next door, can understand mathematics?

The fat man is very familiar with this class of students, and he gets straight to the point from the beginning.

The three friends meet to drink, each has a pot, and the wine money is paid by themselves. Each pot of wine is ten copper coins, and the three people pay a total of thirty yuan. After drinking, the shopkeeper was bold, and only took 25 copper coins for three pots of wine, so that Xiao Er returned five copper coins to the guests. Xiao Er is greedy, and he keeps the two private treasures for himself, and the three guests retreat consistently. So far, the three of them actually paid nine guan each, 39 for a total of 27 guan, plus Xiao 2 stealing 2 guan, a total of 29 guan. Q, where did the money go?

After the fat teacher put down the topic, he left the class directly. And the students in the audience silently calculated, silent.

This stunned man teaches tricky and eccentric, and everyone is used to it.

Ren Pingsheng sighed, leaned back on the chair, and concentrated on it, dreaming of Zhou Gong. I came to the Taoist Academy, of course, to listen to Fang Mao's father's lectures, and to talk about these strange things that don't learn and don't know how to do it, what kind of trouble? Lao Tzu spends all night practicing swords, sharpening swords, drawing talismans, and doing a lot of business.

Before falling asleep, Ren Pingsheng noticed that the little man sitting at the front of the classroom only pinched his fingers slightly, and when the fat teacher left, he took out a black and white Spring and Autumn book from the bookcase next to him, and quickly immersed himself in it. This book is said to be written by the prehistoric chess saint Huang Longshi, which analyzes the ten famous games that have not been solved for thousands of years in the world, and is the most talked about by the world's best players.

Zhong Zhenshu, who is known as a prodigy, is undoubtedly a chess idiot.

Ren Pingsheng had a very strange dream, in which there was a colorful screen, showing countless wonderful pictures, in which the delicate colors, the clear and meticulous strokes of the text and strokes, are incomprehensible today. The scene is as familiar as a dream meeting childhood. Looking at the black board lying flat on the table under the screen, the board is not gold or iron, and there are dozens of small squares marked with strange symbols. Ren Pingsheng's ten fingers, which were as agile as flying, gently tapped the small squares on the board, and words flashed on the screen, and the screen switched.

It was as if he had suddenly found something that had been lost for a long time, and he remembered the name of the strange thing. In a world that should have long since disappeared, that thing is almost indispensable to human life. In the past, when the master explained easy calculation and basic arithmetic to himself, this strange thing had faintly appeared in Ren Pingsheng's mind, but it had never been so clear. It seems that many years ago, I used to be in front of that screen day and night, busy and monotonous, but I never tired of it, all year round. But as for what they did, they couldn't remember in any way. However, there are many complicated ancient arithmetic knowledge, such as the lack of embankments in the long river, surging into my mind.

Ren Pingsheng couldn't help but be overjoyed and shocked in his heart. In the past, when I looked at all kinds of words and all kinds of objects, although I always triggered a lot of strange memories, they were always very fragmentary, nothing more than some items that I had never seen, words and words that I had never learned, and at most some superficial knowledge and truths that seemed familiar. Even so, when I used to learn from the second master, I was often able to receive the effect of touching the bypass and drawing inferences from one another, showing a high talent and fast progress, which was not like ordinary people.

But in such a big dream, the adventure of being given a complete knowledge has never been there.

When he was panicking and didn't know how to deal with himself, Ren Pingsheng felt that one cheek suddenly came into contact with a soft and fat object, which was extremely powerful. His head shook suddenly, and he woke up in shock, and found that the fat man had taught him to slap him in the face, and he was still in full swing.

Ren Pingsheng wanted to have a seizure, but he was glared at by the fat teacher, and then suddenly found that the classmates around him were secretly looking at him and snickering, so he remembered that this was a classroom in the Taoist Academy, and he lost the heart to fight back.

"You transferred to the class?" The fat teacher's small eyes narrowed so that there was only a gap left, but it made people feel a little creepy.

Ren Pingsheng nodded, looking at him.

"So you've learned?"

Ren Pingsheng shook his head, still not speaking.

Fat Jiaoxi's chin was raised, and a layer of frost instantly spread on his face, "Fang Liang Dao Academy, I have accepted many students. Men and women are big and small, but there are no stupid ones, and it is impossible for a pig to eat and wait for death. This place, no matter how rich you are in the world, it is impossible to spend money to enter. Anyway, how did you get in?"

At this moment, all the students who were looking at this place looked a little strange, and they wanted to laugh but didn't dare to laugh. The two are opposite, who is more like a pig, it goes without saying.

Ren Pingsheng was a little annoyed, but he didn't want to ridicule him, after all, this kind of humiliation that was superficial in words was accustomed to it for more than ten years.

"Whether or not you can come to the Taoist Academy is up to the teaching and learning team of the examination team, or like you, it's the master who has the final say. But whether or not I can take my class, I have the final say. Fat Jiaoxi said with disdain, "So, if you can't solve this problem, you won't use this classroom in the future." ”

"That's not right. Finally waiting for the fat teacher to finish a round of bombardment, Ren Pingsheng said lightly, "It's not that even the kid in front of me has not been deceived." ”

As soon as the words came out, Ren Pingsheng knew that he had stabbed the hornet's nest, and the eyes gathered around him were very complicated, or ridiculed, hateful, or shameless. The face of the tall young man Zhou Cheng was especially indignant, it doesn't matter if you can't think of it yourself, uncle, everyone can't think of it, but you are a newcomer, what kind of thing is it to pull Zhong Kuishu into the water?

The fat teacher just sneered, his eyes looked at the kid in front of him coldly, and he sneered at each other silently. The meaning of the problem is, of course, just that you can't solve it yourself.

Ren Pingsheng spread his hands and said helplessly: "Okay, I just think that in this holy place of learning that students in the world flock to, it is not appropriate to discuss this kind of number game with children." Since the gentleman wants to say it, it doesn't hurt for me to say it. It's not that the question is unsolvable, but that the question itself misleads thinking and covers up the fallacies of the question itself. ”

"In fact, each of the three of them paid nine copper coins, and a total of twenty-seven copper coins were spent, which is true. Among the twenty-seven guans, the shopkeeper received twenty-five guans, and Xiao Er stole two guans, which is a very simple algorithm. And the title deliberately reiterates the thirty yuan paid by the guest in advance, and puts the two guan stolen by Xiao Er outside the twenty-seven guan, and double-counts, not only becomes a total of twenty-nine guan, but also seems to have the consistent money disappeared. This kind of trick of stealing beams and changing pillars, in fact, is good to play after class, and as real knowledge, I am afraid it is easy to mislead people's children. ”

As soon as the words came out, except for Zhong Lishu, who was separated by several rows, he remained silent, and the classroom suddenly exploded. After thinking hard for a long time, many human geniuses who almost fell into a blind corner of their thinking suddenly realized that they were both happy and lamented.

When Ren Pingsheng spoke, his eyes never left the uncertain face of the fat teacher, thinking that the guy would be annoyed and angry, and blasted himself out of the classroom. It's nothing if you don't go to his class, but you are so embarrassed on the first day of school, and in front of your classmates, isn't it very shameless.

I never thought that the originally arrogant teaching, not only was he not annoyed, but his face instantly eased and his face was full of smiles.

"Where did you learn mathematics and science?" said the teacher with a squint.

Ren Pingsheng shook his head and said honestly, "I haven't been to school." ”

Jiao Xi was a little surprised, but he still looked unwilling, and asked, "Who did you learn it from?"

"I learned easy numbers and divination from a master who sold hexagrams, and there were basic algorithms for addition, subtraction, multiplication and division, but there was no such difficult arithmetic. Ren Pingsheng said with a flat expression, "It's just that as soon as Mr. said the topic, I saw the fallacy that was deliberately concealed." ”

Fat Jiao Xi nodded silently and walked back and forth. In the Taoist Academy, there are often different kinds of students, and he has not seen them. There was silence in the classroom, and the pin drop could be heard. After being silent for a long time, Fat Jiaoxi stopped and said to Ren Pingsheng: "Basic arithmetic, there is really no need to teach it in this Taoist academy, so I will give another question here, if you can solve it, it is not a question of whether I let you enter this classroom, but you come, I welcome, but it is meaningless to you." ”

Ren Pingsheng nodded, his expression unfazed.

"At present, the maps of various states are drawn with ink lines on Tongchuan Xuanzhen straw paper. Therefore, there are only ink lines and the color of the paper on the map, and the shape and boundary of each city and region are not easy to distinguish. If you change to color dyeing different regions from now on, any adjacent two city regions cannot be the same color. Q, at least a few colors are needed to draw a map of the states of the world according to this requirement?"

Dozens of eyes suddenly converged on the teacher. Those classmates who were originally suspicious of Ren Ping's life all shook their heads secretly at this time and sighed quietly.

Jiao Xi just looked at Ren Pingsheng, who was close at hand, with a calm expression and no eyes.

Thousands of years ago, as the world's largest continent, but also the birthplace of Taoism in Xijing City, there were the world's public opinion circles, trying to draw a color Yan'an Prefecture Kanyu map, it took several years, the sketch was full of houses, and finally the most concise and clear one, sharing seven colors.

Since then, everyone in the world has taken this as a model, thinking that at least seven colors should be used to draw a map. It's just that the first seven colors of the map, when he died, told the world that he had calculated all his life, and was sure that he could draw this kind of map with fewer colors, as for the best colors, he died and could not be verified, because he regretted his life.

Since then, thousands of years have passed, and the mainstream Kanyu maps in various places are still dominated by monochrome ink lines, but all those with color are seven colors.

Therefore, the question of at least drawing a map of the world in a few colors is still a mystery in the world, and the students who have studied in the Taoist academy for many years are well known. Fat Jiaoxi is embarrassed by this, a sixteen or seventeen-year-old transfer student, who is the pride of this class, and he also feels that he is not martial.

"Just four colors. Ren Pingsheng said almost without thinking.

The fat teacher couldn't hide the extremely exaggerated look of surprise, and a pair of big hands suddenly grabbed the young man's shoulders, and his eyes widened: "Are you sure?"

Ren Pingsheng nodded, "I can prove it for Mr." ”

Fat Jiaoxi suddenly turned his head and explained to the whole class: "Today's math and science class is over. ”

Before the students left, the fat teacher had already dragged Ren Pingsheng by the hand and quickly dragged him out of the classroom.

"Let's go and talk to my building!"