Xueba, I beg you to go and escort him quickly!

"Four situations may occur alternately, for n≥N, if..."

"..."

"Combining the convergence of an proved above, it can be seen that an is convergent, that is, there is a sufficiently large M≥N, so that for any m≥M, there is a(m+1)=am."

He Junfei's voice fell slowly.

In the classroom, there was no sound, and a needle could be heard.

He Junfei answered the questions with ease.

Everyone was stunned, and the teachers and students in the other two provinces were collectively confused.

They looked at He Junfei, and then looked sideways.

They were also dumbfounded.

Depend on! ! !

Did you do it on purpose?

The students in your own province have proved it, you are so surprised!

"Don't say you don't know! Don't say this question, you didn't arrange it in advance!"

"hiss……"

"Anyway, it's me, I can't answer this question!"

As high school mathematics teachers, their knowledge reserves have degraded a lot.

They are very self-aware about such topics.

The leaders of the Education Bureau and the mathematics professor whispered a few words.

After the professor nodded slightly, he also gasped.

He Junfei returned to his seat.

For a while, many students forgot to continue to communicate, but stared at the ideas on the blackboard, and started to understand and learn.

From this point alone, from this question, the other two provinces have been killed in seconds!

3 minutes later……

5 minutes later……

The host cleared his throat, "Everyone..."

Just speak!

Feng Hechuan got up and stepped forward, with a painful expression on his face, he erased He Junfei's question!

Write on it:

Prove that for any integer n, there exists a unique polynomial Q(x) with coefficients ∈{0,1,…,9}, Q(-2)=Q(-5)=n.

Xu Heng watched, the corners of his eyes twitching fiercely.

All the students looked at it with blank faces.

But soon, some students who participated in the finals of the Mathematical Olympiad recognized this question.

"This is the final question!"

"Student Feng is amazing! He memorized all the questions! It seems that after the competition is over, he has put in a lot of effort!"

Another Olympiad problem!

And it's a final question!

The students who did not enter the finals were all dumbfounded.

Are the final questions so concise?

that's it?

Just one line, that's all?

But with such a short line, the students who participated in the finals were wiped out!

No one, including Feng Hechuan, has proved it correctly.

"Another Mathematical Olympiad question?"

"Student Xu Heng, this..."

"Master Xu Heng, this question..."

The 56 students in the province looked at the blackboard, and when they heard that this was the Olympiad final question they had just passed, they all turned their heads and looked at Xu Heng.

The leading teachers of the other two provinces were even more frowning, very puzzled.

"What's going on? Why do they all look at this classmate?"

"hiss……?"

"I can understand if they are blank or aggrieved, but they are like this!"

"What's worse, when they looked at the student behind, they even had smiles on their faces!"

"This is the proof question for the finals!"

The Mathematics Olympiad competition has only ended for a few days, and even if the topic is spread on the Internet, it will take several months. It is impossible for others to know the topic!

Unless it is a contestant who participated in the finals!

But in their province, no one has participated in the finals, and for Feng Hechuan, even after spending a lot of time after the competition, he still couldn't come up with the answer to this question.

He has also consulted many people, but some people just let it go after getting the topic.

Because they don't want to make a fool of themselves!

I went to consult the professors of the universities in the province, but there was no news for a long time.

So, on the whole.

No one knows the correct answer to the final proof question of this Olympiad competition!

Even if someone can answer it, at least not now.

This kind of proof question has to go through repeated scrutiny!

Even for the final group of the Mathematical Olympiad, the answer will be announced in a few months, but before that, don't even think about it.

Feng and Chuan are betting!

To be precise, he decided that no one person could answer this question.

"This question seems simple, but it is actually quite difficult..."

"Oh, by the way, this is the final question of the Mathematical Olympiad. You probably haven't seen it before..."

"..."

"As the previous classmate said, this is an exchange meeting, so please hurry up."

"Because of the difficulty of this question, give me 20 minutes, okay?"

The voice fell, and there was an uproar.

But the next second—

rub!

Yang Kaixuan stood up.

Everyone looked at it suddenly...

Yang Kaixuan, "How could this question take so long!"

I rely on! ! !

Don't be ashamed!

Sure enough, they were the ducks who were beaten to death, and they had a hard mouth, and their momentum was well controlled!

Someone recognized Yang Kaixuan.

"This guy is in the exam room with me. After the preliminary round, there is no one left! He didn't even pass the rematch. He knows this question?"

"What? It's really a sensationalist!"

"He also said it won't take that long, why doesn't this guy go to heaven!"

"I said classmate, this question seems simple, but in fact..."

"Yes! It can be used as a proof question in the final. Do you think it is as simple as one plus one equals two?"

"Sit down!"

Yang Kaixuan took a deep breath, his eyes swept across the audience.

"not me……"

Everyone was surprised.

not you!

Then why are you standing up?

This is an oolong!

Yang Kaixuan continued, "That classmate, when you took out this question, did you ever consider the mood of the questioner?"

Feng Hechuan, "???"

Teachers and students, "???"

Yang Kaixuan, "I told you not to worry about the Mathematical Olympiad all the time! You have to! Do you really think these questions are difficult? Are you proud of doing them?"

"But the person who created the question clearly thought it was very simple!"

"That's right, student Xu Heng."

Xu - Heng -

When these two words echoed in the classroom, many teachers and classmates trembled.

Xu Heng!

It's that Xu Heng!

Is that Xu Heng who was on TV?

Xu Heng who was a judge at the Poetry Conference, right?

　　As for Xu Heng, some people noticed him because he attended the poetry conference!

Other than that, nothing else.

At that time, many people thought that it was unbelievable that Xu Heng participated in the poetry conference at a young age and even became a judge.

Xu Heng was deeply impressed.

Moreover, Xu Heng's suit and leather shoes at that time deviated from his current image.

In addition, this is the home of the mathematics competition and has nothing to do with literature, so I didn't expect it.

Among the teachers leading the team, someone suddenly patted his thigh, "I remember! It's him!"

"It's just that you are a literature student, why did you come to the mathematics exchange meeting?"

"Is there no one in your province?"

"Did you go out?"

Faced with all kinds of doubts and doubts, Yang Kaixuan explained, "Don't you all know that Xu Heng is one of the participants in this Mathematical Olympiad competition?"

"The question that this classmate wrote on the blackboard is the one he came up with."

Not loud!

But the words were like depth charges, exploding in everyone's minds!

"!!!!!!!!!"

Is it the person who draws the paper?