Chapter 22 Casually Playing at Seventh High
Let A=a b,B=b c,C=c d,D=d e,E=e a
Then S= A,B,C,D,E>-2(each capital letter is equal if and only if the corresponding value of two lower case letters is equal to-1),
A B C D E=10.
When S takes the maximum value, there are even numbers of negative numbers dao in the capital letters.
1. Four negative numbers, let's set A,B,C,D
……
There were many steps to solve the problem, but in the eyes of the teacher, it was astronomy.
Because Ma Aiguo had spent a day answering.
This was a real Mathematical Olympiad question, a question that was not announced to the public.
"You wrote it out just like that? Have you seen it?"
" No, I just thought it was very simple. Actually, it could be solved using Cauchy's Inequality. The core of the question is…"
Tao Yaoyao quickly covered Chen Fan's mouth. Chen Fan was curious and Tao Yaoyao said,""Wait until they are done. The questions are not easy to get. If you give them hints, it won't be of any help to them.”
"Oh, okay, but this question is indeed not difficult. The difficult part is that you don't think it through.”
There was still a hint.
Chen Fan went to write the rest of his algorithm.
The rest of the students were still struggling to solve the puzzle.
When Zhou Ke handed in her paper, thirty minutes had passed.
After the teacher finished reading it, he said helplessly,"It's still a little lacking. Think about it again. You don't have any more cola.”
Aiya, annoying.
The girl sat down in her seat and continued to calculate.
The rest of the students also handed in their papers. They all made the same mistake as Zhou Ke.
"Are you all trash? Ah, how did you guys get the title of number one? Why did they all make the same mistake?”
Ma Aiguo was furious.
For the past few days, he had been listening to Hwa Xiong brag about Chen Fan. He was already annoyed, so he finally agreed to be a training teacher. However, he was met with such a show of strength.
How could he teach such a student? Teach what?
However, there was a saying in Peking University that if you were to say how many professors were good at mathematics, it would be countless.
However, there was only one teacher with the best foundation, and that was Ma Aiguo.
He might not be the best teacher or the best at solving questions, but he was the man who was named after the sweeping monk at the University of Technology.
Without a wife, he spent his entire life in the education industry.
There was no need for teaching materials.
He liked to lick the plates when he ate.
He had spent a lot of wine to get this teacher to give him a special treatment.
This teacher didn't like to give special treatment. He believed that students should be treated equally and that giving other students a chance was the best.
"All of you, I wonder how you guys got full marks in Mathematics. Recently, the papers issued by the Ministry of Education are getting worse and worse. You can't tell the level of the students at all.”
F * ck, answer the question."
Could Chen Fan do it?
Chen Fan stood up and said," The biggest contradiction is one. The case of four negative numbers is omitted. A,B,C,D is-2, E is 18.
S= 24 ×18=288 is the maximum possible value in this case.
However, in this case, a,b,c,d,e=-1 is not four negative numbers, so S must be less than 288."
After saying that, Chen Fan returned to his chair.
She looked at the blackboard in a daze. No one knew what she was thinking.
"Do you understand? "This question is difficult, but in the Mathematical Olympiad, this question is given for free. All of you, if you're still doing this, there's no need for you to participate in the competition.”
What was the mathematics training for?
Actually, he didn't teach anything. He just did the questions, changed them, and then expanded his knowledge.
"Your coke."
Chen Fan held it in his hand and was very happy.
Tao Yaoyao was very happy to see Chen Fan smiling.
Tao Yaoyao had heard of a saying in crosstalk," Don't try to persuade others to be kind." Chen Fan's childhood experience was something that no one else could experience.，
If Chen Fan really wanted to take revenge on the world, it was understandable.
"Tomorrow, cheer up and follow me for a run in the morning.”
Oh my god, he was going to kill someone.
However, he could only lower his head and accept it.
After the students left, Chen Fan took the initiative to find Ma Aiguo.
"Teacher."
"I'm not your teacher. Go to the side. I know Ma Guowei. He has a good foundation.”
"I want to ask the demon horde."
"What? Didn't Ma Guowei persuade you?"
"I did, but I didn't want to give up.”
Sigh.
Ma Aiguo said," If you know all the questions I set these few days, I'll give you everything I know. But I have a lot of knowledge. I'm good at theoretical mathematics. You can find all the theories from any era and stage. I know them all."”
"Alright, thank you."
After saying goodbye to Ma Aiguo, Chen Fan left the classroom.
Ma Aiguo called Hwa Xiong.
"Demon horde, how should we deal with it?"
"You've studied it for half your life, so just give it to him.”
"I'm afraid he'll fall for it."
"I was worried that you were hiding it."
" What's there to hide? It's just some stupid theory. Since you don't care, I'll teach you. I only have a little time. He's good at Mersenne prime numbers, and so can the magic group. Can't you mathematicians teach Chen Fan how to write the word 'give up'?"”
"Have you ever given up after so many years?”
He hung up the call with Ma Aiguo. He didn't expect to receive such a precious student at his age. He hoped that Ma Guowei's foundation was not bad.
My classes aren't that easy.
In the faculty dormitory, each student had a room.
At night, the rest of the students came to find Chen Fan.
Everyone shared their food with Chen Fan.
Zhou Ke even shared the potato chips.
Chen Fan took out the hazelnuts from the village and gave them to them.
Tao Yaoyao had prepared this in advance, so Chen Fan could use it.
Chen Fan looked at the Peking University campus outside the window. Now, he was considered a Peking University student?
She could be considered a nanny at Peking University. It felt weird.
She did not expect this little boy to be so outstanding.
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