How to break into a math book

After hearing the rules clearly, Tu Hua realized that this mission was probably the most clueless one he had encountered since entering the game.According to the requirements, each of the ten of them represents a numerical value. After finding the functional relationship between each of them, they are divided into two camps, the domain of definition and the range of value.It is very simple to find the functional relationship between sets of numbers, but they are not objective numbers, so it is almost impossible to forcibly pull out the functional relationship before everyone.

The most important thing is that the task does not require ten challengers to form a team, which means that ten of them must work together to complete it.It seems that unity is powerful, but everyone has different ideas, and it is easy to have differences.Especially the menacing Li Tao, who alone can increase the difficulty of the game a lot.

After the rules were announced, everyone fell into deep thought.It is very easy to climb the two high platforms of red and blue. The problem is who goes to the red domain platform and who goes to the blue value domain platform. There is no clear standard for them to distinguish.

Tu Hua carefully recalled the definition rules of functions in his mathematics textbook. He could only remember a general idea, which seemed to be about the correspondence between two sets of numbers. As for the specific text description, he could not remember clearly.

Chen Li remembered it clearly, and she memorized the definition of the function: "Suppose there are two non-empty number sets, if according to a certain definition rule, for any number in one set, there is a unique number in the other set The numerical value corresponds to it, then this correspondence is called a function.”

Tang Bo pondered: "So we must find the corresponding relationship between each other."

Zhang Wenwen said: "Could it be classified according to gender?"

Tu Hua shook his head: "Only from the perspective of boys and girls, there is no clear correspondence between the two genders. Besides, we have four girls and six boys here, and the numbers are not equal."

I don't know if it's for the purpose of shaming or what, Li Tao, who has been silent all this time, suddenly mocked: "Have you passed the math? You don't know such a basic thing?"

Tu Hua, who had been poked into the weak spot, glanced at him calmly: "What's your opinion?"

"I'm not agreeing with this girl's statement, I just want to refute you." Li Tao snorted coldly, "Who told you that the values ​​in the domain and value domain are equal? ​​The definition of a function is that every value in the domain The number x has a unique y corresponding to it. It does not mean that each y has only one x. There are many examples of this kind. The simplest example is the quadratic function. There are two x values ​​with the y value equal to 0. This is It is proved that there may be two, three or even more x corresponding to the same y, and the number in the definition domain is more than the number in the value range, and this situation is common.”

"So if there is a functional relationship between men and women, boys with a large number belong to the domain of definition, and girls with a small number of girls belong to the range of value. You don't even know such a basic definition? How do you do it in this mathematical breakthrough?" Live up to now?" Li Tao glanced at Sun Wei, and that sinister and arrogant gaze fell on Tu Hua again, "I'm afraid he came all the way up by his thigh?"

Tu Hua really wanted to take out the ghost stone from his backpack and slap him on the face, but thinking about it, his theory seems to be correct, the values ​​between the definition domain and the value domain are not necessarily one-to-one correspondence , It is true that Tu Hua, a mathematics scumbag, did not understand the situation.Although Li Tao's words were harsh, they pulled him back from the wrong path in time.

If the skills are not as good as people, then you have to swallow your anger.

Wang Boyu leaned into Tu Hua's ear: "Who is that person? Do you know each other? Why is he targeting you like this?"

Tu Hua sighed: "I met a snake spirit in the last pass."

Wang Boyu understood instantly and was ready to avenge his brother.He is tall and tall, with a prickly hair, and he looks like a street gangster with his chin up and his nostrils in the air.He squeezed his fists and gave Li Tao a squinting look: "Everyone is discussing seriously, why are you so ugly when you say something? What's the point of verbal and personal attacks, otherwise we can compete with real swords and guns?"

Li Tao is obviously a weak chicken who doesn't work all day long and only knows how to read at his desk. Wang Boyu estimated that he can lift him up with one hand.

Seeing the tense atmosphere, the man in the peaked cap hurried out to smooth things over: "Well...Actually, I think it might be right to classify by gender. Anyway, we don't have any other ideas now, why don't we try?"

Several people agreed.Tu Hua has already refuted it once, if he insists on raising an objection, it will be a bit too easy to be confronted.Although this level is difficult to figure out, what is more important is the cooperation between the ten people. Once there is a conflict with most of the people, it will be difficult for him to get support for his next suggestions and ideas.

Besides, he really doesn't have any ideas now, so he has to follow the trend.

Everyone climbed to their own high platform according to their gender and the results of the discussion just now.Four girls went to the blue range station, and six boys went to the red definition station.

【Ding--】

[Challenge failed. 】

This game is really not as simple as imagined.Tu Hua jumped off the high platform. He always felt that this clue was buried very deep, and he might have to find another way.There is no competition between the ten people in this level. The only way to pass the level is cooperation, and cooperation needs communication most.

Could it be that they need to communicate with each other to get the secret information?

"Di-di-di-di-di-di-" A sharp and piercing sound of electronic music came from Sun Wei's direction, and Sun Wei was obviously startled by the sound. It came from her system backpack, she quickly turned on the system and found the source of the sound.

It is the reward calculator obtained in the previous level.

Sun Wei pressed a few keys, and the beeping of the calculator stopped, but when she saw the screen of the calculator, her face became visibly stiff.

"Tu Hua!" Sun Wei ran over and handed the calculator to Tu Hua.I saw a line of words written on the gray screen of the calculator: [The law of correspondence is the link that connects you. 】

Here's a hint!

Tu Hua and Sun Wei looked at each other, and they didn't expect this seemingly useless calculator to be a prompter!Although there is only a relatively vague reminder, it has already given them a clear direction!Tu Hua was a little excited. This was the first level they encountered after receiving the reward. Does it mean that the calculator will give hints for every level in the future?

Several people came over to see it, and Tu Hua hurriedly put the calculator back into Sun Wei's hand.It is undoubtedly very powerful to have this kind of props that give clearance information in the game. The more people know about it, the more jealous they will be. Keep your cards.

Sun Wei quickly stuffed the calculator into his backpack and explained calmly, "The calculator is broken."

"So we failed just now, right?" Sun Wei paused, "Then there are only two chances left. I think...the law of correspondence is a very important part. This time we must find mutual Correspondence is the only way."

Zhao Yiwei, who had never spoken much, sighed, "But most of us don't know each other, so it doesn't matter..."

"Wait!" Tang Bo stood up suddenly, "Although we don't know each other, it doesn't mean that we are not related. Could it be divided by region?"

Tu Hua took the lead in cooperating and said, "I, Wang Boyu, and Sun Wei are all from N City."

The peaked cap said: "I, Zhang Wenwen, and Chen Li are all from City A."

Zhao Yiwei whispered, "I'm from City B."

Tang Bo turned to look at her: "I am also in City B. How about you two?" In the end, he asked Li Tao and Shen Siyi.

Li Tao stroked his chin and said nothing, Shen Siyi replied: "We are both from City B."

"So out of ten of us, there are 3 people from city N, 3 people from city A and 4 people from city B. A, B, and N are probably the corresponding relationship between us. After all, this is the only relationship among our ten people. Contacted." Tang Bo concluded.

Shen Siyi frowned: "But how should we divide the definition domain and the value domain? For example, the four of us are all from City B. This is the functional correspondence between us, but who among us is the number in the definition domain? Who is the number in the range?"

Tang Bo looked at Li Tao: "This will use the theory that the classmate just emphasized."

"First of all, for any number x in the domain, there is a uniquely determined number y corresponding to it in the domain, but the x corresponding to y in the domain is not necessarily unique, which means that in the domain There are more numbers than there are values ​​in the range. Second, and most important, the correspondence law is not necessarily unique."

"In addition to geographical correspondence, gender correspondence is also possible."

Tang Bo paced among several people, dividing everyone according to the domain of definition and value domain: "First of all, for the two women and one man in city A, the two girls belong to the domain of definition, and the boys belong to the domain of value. The corresponding relationship between gender and region, and clearly separate you through the non-uniqueness of the domain value."

He put the peaked cap on the right, belonging to the category of value domains, and Chen Li and Zhang Wenwen on the left, belonging to the category of definition domains.Then there are Tu Hua, Wang Boyu, and Sun Wei who belong to N City. They are also divided according to gender. Tu Hua and Wang Boyu are on the left, and Sun Wei is on the right.Finally, there are Tang Bo himself, Zhao Yiwei, Li Tao, and Shen Siyi, with Zhao Yiwei standing on the right and three boys standing on the left.

Thus the division is formed:

People who belong to the definition domain on the left are: Chen Li, Zhang Wenwen, Tu Hua, Wang Boyu, Li Tao, Shen Siyi and Tang Bo.Those who belong to the value range on the right are: Cap, Sun Wei and Zhao Yiwei.

Although there is a large difference in the number of people on both sides, all the conditions for the function are fulfilled.He divided the definition domain and the value domain through the corresponding relationship of quantity, and found the corresponding law. In addition to gender, there are also regions.

Everything seems to be in order, but Tu Hua always feels weird.Judging by the prompt given by the calculator: [The law of correspondence is the link that connects you], it seems that there is nothing wrong.

Is this the correct answer?

The author has something to say: This is not the correct answer_(:з」∠)_