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

Everyone, "I understand the truth, but Xu Heng, you just gave the answer?"

"We are calculating step by step on the acting paper, and we can't be sure that everything is correct. You, this...is too scary!"

"Damn it! Even if I'm mentally prepared, even if I've tried to get used to it, I'm still shocked, okay?"

"Xu Heng...you are so perverted!"

Xu Heng handed the test paper and acting paper to Yang Kaixuan.

He continued to look at his phone as if nothing had happened.

Everyone, "!!!"

Yang Kaixuan didn't say much, and went back to his bed after getting the answer, and looked at it seriously.

Not only to look at the process, but also to look at Xu Heng's problem-solving ideas.

Why did Xu Heng use this method?

This is the key to Yang Kaixuan's learning.

One question, one answer.

The other roommates were ignored like air.

One test paper, Yang Kaixuan did two classes and the evening self-study is not finished yet!

Then I took it to the dormitory and did it for a long time.

Do it and ask questions.

"Xu Heng! Here..."

"Xu Heng, the idea of ​​this question..."

"Xu Heng..."

Finally, as he was about to finish, Xu Heng went to the toilet and saw Yang Kaixuan's last question.

"Wrong, not right..."

Fuck! ! (Qian Nuo Zhao)!

puff...

Yang Kaixuan tossed and tossed about for almost an hour, Xu Heng finally said something wrong and denied it to him!

If you have a bad heart or high blood pressure, just pass it!

Yang Kaixuan took a deep breath to keep himself calm.

"Then what is your thinking...?"

Yang Kaixuan patiently asked Xu Heng for advice.

Xu Heng waved his hand, "Wait a minute when I come back from the toilet."

The title of this question is:

Let i1, i2, L, and i10 be an arrangement of 1, 2, L, and 10, write S=丨i1-i2丨+丨i3-i4丨+L+丨i9-i10丨, and find all that can be obtained from S value.

Topics are few!

However, when many people see the question, they feel like they are going to die.

If this topic is likened to a mountain, then this is a Mount Everest!

Yang Kaixuan, "Xu Heng, we are running out of time! Turn off the lights now..."

Xu Heng, "It's okay, I'll talk to you verbally later."

Word of mouth?

!!!

Pfft! ! !

Xu Heng, do you know what you are talking about?

You actually want to calculate the Mathematical Olympiad problem?

And it's an additional question in the Mathematical Olympiad!

This is an additional question for the finale!

"This question is relatively simple, don't worry, wait for me to come back."

As soon as Xu Heng went to the bathroom, the lights in the dormitory were turned off.

Yang Kaixuan, "..."

Roommates, "..."

When Xu Heng came back in the dark, all the roommates were lying on the bed.

Xu Heng climbed onto the bed, connected the phone to the charger and put it aside, then he spoke slowly.

PS: Thanks to [Wuxin] [Sword and Black Tea~] [Lord of Hell] [Tail number 3442] [Yu Sheng Zi Drunk] [Yuyue Jianghu] [fxinyi] for their support!

thank you!I wish you a fortune in 2021!

Seeking all support, on the last day of 2020, we will continue to explode! .

Chapter 135

"This question is very simple, here you have to clarify one thing..."

After getting into bed, Xu Heng didn't even have the intention of reviewing the topic again, so he started talking directly.

Yang Kaixuan pricked up his ears and listened carefully.

The other roommates are also very knowledgeable and try not to make other noises.

许衡，“S自然是要大于等于1+1+1+1+1，也就是5，这个你要明白吧？”

“而且S也是小于等于6+7+8+9+10-（1+2+3+4+5），也就是25……”

"..."

"Here, it needs to be proved that S can take all odd numbers from 5 to 25."

"..."

"Finally, so the values ​​obtained by S are: 5,7, 9, 11, 13, 15, 17, 19, 21, 23, 25, [-]."

"It's over, you digest and digest, and I'm going to sleep."

Turning around, Xu Heng fell silent.

Only Yang Kaixuan was left alone in the dark.

Nima!

You, Xu Heng, keep saying it's easy, but why do I find it so difficult!

You speak so fast, just like Gatling, at least give me some time to slow down!

what! ! ! ——

He broke down!

He felt like he was that giant groundhog.

Speechless!

Completely speechless!

"Hey……"

Finally, the whole dormitory heard Yang Kaixuan's sigh.

It's that kind of resentment, but also a little helpless.

this night!

It was Yang Kaixuan's nightmare.

The next day, he could only ask Xu Heng again.

Xu Heng looked at Yang Kaixuan with surprise.

Yang Kaixuan also had black lines on his face, "Xu Heng! Please treat me like other ordinary students, okay? I'm not much better than them, bah! I'm obviously the same as them!"

"In front of you, do you think there is a big difference between ants and insects?"

"I beg you!"

Xu Heng apologized, "Well, I overestimated you... Come on, do it again!"

After the topic is settled.

The topic between Xu Heng and Yang Kaixuan was far away.

"Don't be so serious! Relax! You are always in a high state of learning, which is not conducive to the development of thinking."

Xu Heng took the initiative to chat with Yang Kaixuan.

"I just saw a joke on my phone."

"Let's list the major events that have happened in the past 50 years. Do you know what this student said?"

Yang Kaixuan, "???"

Xu Heng, "He said, first his father was born, then his mother was born, and finally he said he was born!"

"What a logic genius! There's nothing wrong with it!"

Yang Kaixuan, "???"

And Xu Heng's voice was a bit loud, disturbing the teacher who was in class.

"This……"

And the teacher could see clearly that it was Xu Heng who was speaking!

But he said it to Yang Kaixuan.

"This, this, this...!"

The teacher made a difficult decision, which made me choose between Xu Heng and Yang Kaixuan!

do my best!

"Yang Kaixuan, pay attention!"

Yang Kaixuan was also shot while lying down.

He was in a daze!

Nima!

Teacher!It was Xu Heng who spoke!not me?

Why are you criticizing me?

The teacher was also very helpless, so he could only give Yang Kaixuan a gentle look!

Say it's in your body, it hurts in my heart!

Yang Kaixuan, "%￥##￥￥%..."

Choose between Xu Heng and Xueba!

It can only be Xu Heng!

Xueba, in the teacher's heart, is now secondary.

Yang Kaixuan looked at Xu Heng, "I beg you, what's the matter, let's talk about it after class, okay?"

Fine!

Xu Heng yawned, lay down, and fell asleep.

And the teacher's voice also became much quieter, afraid of disturbing Xu Heng.