Metropolis: My IQ is 300

Chapter 23

Chapter 22 The Seven Ways of Playing Casually (seeking support, sixth more)

Let A=a+b, B=b+c, C=c+d, D=d+e, E=e+a

Then S=ABCDE, A,B,C,D,E≥-2 (Each uppercase letter takes the equal sign if and only if the corresponding value two lowercase letters are equal to -1),

A+B+C+D+E=10.

When S takes the maximum value, there are an even number of negative numbers dao in the uppercase letters,

1. Four negative numbers, might as well set A, B, C, D

...

There are so many problem-solving steps listed, but in the eyes of the teacher, it is astronomy.

Because Ma Aiguo took a day to answer.

This is a real Mathematical Olympiad question, and it is not announced.

"Did you write it out? Have you seen it?"

"No, I just think it's very simple. In fact, it can be solved by Cauchy's inequality. It will be even simpler. The core of the problem is..."

Tao Yaoyao hurriedly covered Chen Fan's mouth. Chen Fan was a little curious. Tao Yaoyao said: "Wait for them to finish it. If you can't get the question, it won't help them."

"Oh, yes, but this question is really not difficult, the difficulty is that it is not comprehensive."

Still give a hint.

Chen Fan went to write his remaining algorithm.

The rest of the students are still trying to solve them, worrying.

Thirty minutes had passed when the paper was ready for the week.

After reading it, the teacher said helplessly: "It's almost a bit after all. Think about it again. You don't have any Coke."

Oops, hate it.

The girl sat in her seat with a choked air and continued to calculate.

The other students also handed in papers, all of them guilty of the same problems as Zhou Ke.

"Are you all rubbish? Ah, how did you get the first name? Why did you all make the same mistake for me?"

Ma Aiguo is really annoyed.

Over the past few days, I have been listening to Hua Xiong blowing Chen Fan. He was very annoying at first, and finally agreed to become a training teacher. As a result, he encountered such a smashing power.

How to teach such a student? What to teach?

But at Peking University, there is a saying, if you say how many professors are good at mathematics, then there are countless.

But you said that there is only one teacher with the best foundation, and that is Ma Aiguo.

He may not be the most powerful teacher, not the best at doing questions, but he is the man named after the sweeping monk of Harbin Institute of Technology.

Without a wife, he spends his entire life in the education industry.

No textbooks are required for class.

Like to lick the plate when eating.

It took a lot of wine to let this teacher start a small stove.

This teacher doesn't like to open small stoves. He thinks that students should be treated equally, and that it is best to give other students opportunities.

"You guys one by one, I doubt how you got the full score in your math test. The papers recently issued by the education department are really getting worse and worse. You can't see the level of the students at all, Chen Fan, for you."

Fuck, answer the question

Can Chen Fan?

Chen Fan got up and said: "The biggest contradiction is one. The case of four negative numbers is omitted. A, B, C, D take -2, and E takes 18.

S=2^4×18= is the maximum possible value in this case.

But in this case, getting a, b, c, d, e=-1 is not four negative numbers, so in this case S must be less than ."

After speaking, Chen Fan returned to the chair.

Looking at the blackboard, in a daze, I don't know what I'm thinking.

"Do you understand? This question is difficult, but in Mathematical Olympiad, this question is given for nothing. You give me one by one. If you give it for nothing, you are wrong. If you are still like this, there is no need to participate in the competition. NS."

What does math training teach?

In fact, I don't teach anything, just do the questions, modify the questions, and then expand and extend the knowledge points.

"Your Coke."

Chen Fan held it in his hand, seldom happy.

Tao Yaoyao was very happy when she saw Chen Fan with a smile on her face.

Tao Yaoyao watched the cross talk and heard a sentence, Don’t let others suffer, don’t persuade others to be kind, Chen Fan’s childhood experience is something no one can experience. ,

If Chen Fan really retaliates against the world, then it is understandable.

"Tomorrow, cheer me up and follow me for a walk in the morning."

My goodness, this is going to kill.

But I can only accept it with my head down.

Several students left, Chen Fan took the initiative to find Ma Aiguo.

"teacher."

"I'm not your teacher, go aside, Ma Guowei, I know, that guy has a good foundation, and you can learn well with him."

"I want to ask the magic group."

"Huh? Ma Guowei didn't persuade you?"

"Persuaded, but I don't want to give up."

Ugh.

Ma Aiguo said: "If I have a problem these days, you will be able to do it, and I will give you everything I know, but I have a lot of knowledge. I am good at theoretical mathematics, that is, you can find any era and any stage. I know all the theories of ."

"Okay, thank you."

Farewell to Ma Aiguo, Chen Fan left the classroom.

Ma Aiguo called Hua Xiong.

"The magic group, how to deal with it."

"You have studied for half your life, so just give it to him."

"I'm afraid he will get in."

"I'm still worried about you hiding."

"What's hidden, some broken theories, it's useless, you don't care, then I will teach it, just for a little time, anyway, Mason prime numbers are good at it, and the magic group can estimate it. You group of mathematicians, don’t Would you teach Chen Fan how to give up two words?"

"Have you given up for so many years?"

I hung up the call to Ma Aiguo. Unexpectedly, he was old and sent such a precious student. I hope Ma Guowei has a good foundation.

My course is not so easy.

On the faculty dormitory side, there is one room for each student.

In the evening, the rest of the students found Chen Fan.

Everyone shared the food they brought at home to Chen Fan.

Zhou Ke even shared potato chips.

Chen Fan took the hazelnuts from the village and distributed them to them.

This was prepared by Tao Yaoyao in advance, and Chen Fan can use it.

Chen Fan looked at the Peking University campus outside the window. Now, is he a Peking University student?

It should be regarded as the nanny of Peking University, it feels weird.

This little boy, I didn't expect to be so good.