My Identity As A Schoolmaster Has Been Exposed

Chapter 249 I want to join the group (two more)

“@ Xu Cong 大大! Look at the question wow!”

topic:

Proof: The cube roots of three different prime numbers cannot be the three terms of an arithmetic sequence (not necessarily continuous)

The topic is short!

Concise and concise!

But Xu Cong is not interested, because he still thinks this question is simple.

But in fact, for others, although this question may seem simple, it is impossible to do it.

Prove?

how to prove?

Xu Cong did not reply directly in the group, and said from the side: “It’s just that this question is very old.”

When I was just about to send another sentence, when I tactfully refused.

“Ding!”

In the group, Yang Kaixuan sent a message: “This means that Xu Cong thinks it is too simple.”

Xu Cong turned his head and looked at Yang Kaixuan who was secretly returning the news. He pretended to be anxious and said to Yang Kaixuan: “You guy! You are messing up! If you are like this, I will tell the head teacher that you have secretly brought your phone!”

Yang Kaixuan curled his lips and begged for mercy: “Don’t dare next time, please let it go!”

Hey…It’s hard to guard against a thief!

Since Yang Kaixuan had spoken in the group, he didn’t have to pretend to go on. In fact, he wanted to pretend to avoid talking in the group.

But it’s fine now… the trouble is coming again…

Hey… Xu Cong sighed, and then he could only begin to analyze the problem for the students in the group.

Xu Cong quickly posted all the ideas and steps for solving the problem: “Well, it’s almost like that.”

When everyone saw that he had made this question so quickly, they were all confused: “%%##%”

In private, they also discussed: “Find something a little harder!”

“This question, we are already confused, look for it again, what kind of question?”

“At least I have to force Xu Cong to answer one question for us to see!”

“Too!”

“Although I saw Xu Cong playing games and analyzing the physics problem last night, physics is physics, and it is still different from mathematics!”

“My heart is itchy, I just want to watch Xu Cong do math problems!”

“+1!”

Xu Cong can also think of their general meaning. If Yang Kaixuan hadn’t just crossed in, Xu Cong had already proved it.

Xu Cong hinted to himself, for the next question, no matter what they send, I will directly give the process and answer to the problem!

Probably when the second get out of class was about to end, someone in the group finally posted a question on @ Xu Cong.

topic:

Each positive integer can be expressed as the sum of one or more consecutive positive integers. For each positive integer n, how many different ways n can be expressed as such a sum.

Xu Cong smiled after seeing this question because it is also very simple.

Xu Cong wrote the process directly on the performance paper:

Let m be the positive odd factor of n, m=nd, then n=(d-((m-1)/2)++(d-1)+d+(d+1)++(d+((m -1)/2))(1)

If each term in (1) is positive, then it is a representation of n (represented as the sum of consecutive positive integers).

If there are negative numbers and 0 on the right side of formula (1), then

…

If n has one representation, the number of terms is even, and the smallest term is K+1, then this representation can be “extended” in the negative direction

Then there are (a1+1)(a2+1)(at+1) kinds of representations of n. The solution is complete.

Xu Cong wrote very quickly, writing on the draft paper, extremely silky, without pause at all, and soon the battle was over.

“Crack!”

After taking the photo, he immediately sent it to the group, and then Xu Cong threw his phone on the table, and he ran to the bathroom.

People have three urgency, really, very anxious.

Questions were issued in the group, and by the time Xu Cong finished answering them, there was no more than five minutes!

Even if you search the Internet for Xu Cong and copy according to the answer, it can’t be so fast!

And according to the standard answer, Xu Cong’s approach is a little different!

Lord:”!!!”

Crowd management: “!!!”

Crowd members: “!!!”

“Take it, you deserve to be Xu Cong!”

“Fuck, this is too fast! Don’t you need to think?”

“Really! Really! The answer was given so soon? I searched the Internet and just found the answer to the question.”

“Faster than finding the answer!”

“Isn’t this a human? Have you ever encountered such a pervert?”

“No, but I have encountered the feeling when doing this kind of problem!”

“At the time of elementary school, everyone was doing multiplications. One by one, we had to formulate the equations and multiply one by one. I used a simple method and quickly gave the answer.”

“I have mastered that method, so I quickly gave the answer.”

“I think Xu Cong, it should be like this too!”

Use elementary school multiplication skills to describe Xu Cong’s skills in Mathematical Olympiad?

Everyone was dumbfounded, but after thinking about it, they couldn’t refute it because it made sense.

“@ Xu Cong 大大! Please take my knees?”

“@ Xu Cong大, I really take it! I admire it now!”

“@ Xu Cong 大大? Is it so cold? Why don’t you speak?”

“@ Xu Cong 大大?!”

Everyone began to go crazy with Aite Xu Cong to express their worship.

Although Xu Cong has set not to prompt group messages, if someone @, there is still a reminder.

“Ding! Ding Ding!”

Ding Ding! Ding… keep ringing on the table!

Lin Mengjiao felt the crazy vibration of the phone behind him, and looked back suspiciously, “What’s wrong with the phone?”

So she craned her neck and looked at the phone. Just then Xu Cong came back. Lin Mengjiao smiled and said to him, “Someone is looking for you.”

Xu Cong picked it up and took a look, he burst out laughing, and then said to Lin Mengjiao: “It’s a group of news, these guys have been @我.”

Lin Mengjiao was also interested, and she leaned in to take a glance: “These guys?”

Look at the group name again:

【Xu Cong Fan League】

“Fan group? Where are you from your fan group! No, I want to join the group too!”

“You secretly have a fan base!”

Lin Mengjiao became excited when she saw the name of this group.

Xu Cong was one of the first two big people, and said to her hurriedly: “This is not a fan base!”

Lin Mengjiao screamed, and pointed directly at the group name on it.

Xu Cong continued: “I said this is someone else’s group, do you believe it?”

Lin Mengjiao nodded and said with great approval: “A group built for you by fans! I believe it! Let me see! Goodness! There are more than 50 people!”

Xu Cong is speechless!

Can’t explain it…

Lin Mengjiao continued to ask him: “I want to join the group! You still manage, you pull me!”

Xu Cong looked at Yang Kaixuan and said, “Help me explain!”

Yang Kaixuan also wanted to muddy the water, so he calmly said, “Explain what? Seeing is believing!”

Lin Mengjiao was also very satisfied with Yang Kaixuan’s attitude, “That’s it! Seeing is believing!”

Xu Cong: “…”

Yang Kaixuan also said to the side: “Although it was originally a group of students participating in the Olympiad in the whole province, everyone admires you very much!”

Lin Mengjiao heard him say nonchalantly on the side, and interrupted him directly: “Wait!”

Her expression changed instantly, she looked at Yang Kaixuan suddenly, and asked, “What did you just say? What group was this group before?”

Yang Kaixuan glanced at her in surprise, why did he react so much?

Then he continued: “The group of students from the whole province who go to participate in the Olympiad!”

Lin Mengjiao immediately shrank her neck when she heard that it was from the Orsay group, and said to him, “Don’t add it, don’t add it!” How can she be qualified to join it!

She dare not!

She persuaded!

“You just assume that I haven’t said it!”

“hiss”

Even she herself was shocked by Xu Cong. Although she knew that Xu Cong had reached the top in mathematics, she was surrounded by a group of top students who participated in the Olympiad and regarded as an idol. She never expected it!