Xu Yi walked into the door without saying a word, and suddenly, everyone was watching. The middle-aged man glared at Xu Yi. Xu Yi approached and whispered, "The principal is looking for you, urgent matters."

After saying that, he turned around and left.

The middle-aged man was stunned and waved, "Everyone will study for yourself first, and the homework is the after-class exercises of unit three. The bell rings, everyone will go by themselves."

After saying that, he hurriedly chased Xu Yi, "Hey, who is your teacher? Why haven't I seen him before?"

He looked at Xu Yi's cool and frivolous shorts, and he was confused in his heart.

Xu Yi said, "I am the new teacher Xu from the school office. Secretary Cui is currently in the school office. Hurry up, Secretary Cui is very angry."

When he was flying past the school affairs column at lightning, he remembered the title of the school leader quite well.

The middle-aged man's body suddenly became soft, and Xu Yi supported him, "When the matter is coming, you won't want to leave, think about your own problems carefully and strive for leniency."

"I, I really..."

The middle-aged man is still waiting to cry.

Xu Yi sighed and said, "I'm also soft-hearted. Okay, go and wash quickly. This sweat will calm down."

The middle-aged man was as if he was granted a general amnesty, and he was in a panic and ran towards the rest. Xu Yi followed him.

He rushed to the innermost room on the sixth floor. The middle-aged man of the oil-headed man opened the door. Xu Yi then entered, closed the door, and pulled the middle-aged man of the oil-headed man on a chair and sat down. "Brother, don't ask anything, tell me about calculus."

The middle-aged man was confused and stared at Xu Yi like a monster.

Xu Yi had no time to explain to him more, took out a kitchen knife that had been rushed past the residential area, and without saying a word, he cut his arm, revealing a terrifying wound.

Nothing was bleeding and more impactful. The middle-aged man became quiet in an instant, and he was no longer worried about why Xu Yi made this happen.

He only knew that he could be so cruel to himself and be able to act more accurately against others.

Xu Yi pulled the paper and pen on the table and quickly reproduced the topic of the straw hat chef on the paper. "Can the calculus be unlocked?"

The middle-aged man with a greasy head snatched the neutral pen from Xu Yi's hand, took out a new manuscript paper, and began to list the formula on the paper, saying, "The calculus is not enough, this also involves a problem of curvature. Both the knowledge points of limits and uncertain integrals must be used..."

After brushing, in just over a minute, the middle-aged man finished work and listed the final results.

Xu Yi took the piece of paper and couldn't understand it at all.

He knew that this was because his relevant knowledge points had no foundation. At that moment, he dragged his middle-aged man and started talking about calculus.

The middle-aged man is extremely big, but he can't use Xu Yi's big kitchen blade, so he can only start from the beginning of calculus.

Unexpectedly, Xu Yi's ability to understand was amazing. Often, he only started to point out the key points and Xu Yi could follow the retelling. When he encountered a hurdle, he pointed out a few more words, and Xu Yi suddenly became enlightened again.

Xu Yi mastered the entire knowledge of calculus in just half an hour.

As I said, mathematics is a technology and a thought. Once you have profound mathematical ideas, it is not difficult to master specific techniques.

Xu Yi did not go to the Internet cafe and chose to come to university, because he expected the problems he might encounter during his study and needed someone to answer them in time.

After discussing calculus, the middle-aged man of the oil head began to talk about curvature, limit, uncertain integral, Lagrangian theorem...

Xu Yi's speed of mastery made the middle-aged man secretly shocked. He even wondered if all this was a prank. Otherwise, this man had such terrifying mathematical ability, so why did he come to discuss such shallow mathematical knowledge with himself.

After Xu Yi understood all the relevant knowledge points of solving the problem of the Buli Ke, he casually wrote a few mathematical problems in the world of cultivation that he could not think about.

The middle-aged man said, "What are you talking about? I can't even understand the topic. It's too complicated. You have to go to the Academy of Digital Sciences."

The middle-aged man's answer verified Xu Yi's guess that the mathematical ability of this world may not surpass that world, but as far as mathematical tools are concerned, the mathematical tools of this world are too sharp.

"I'll tell you what other mathematical tools are like calculus, hurry up!"

Xu Yi gestured at the kitchen knife in his hand, and the middle-aged man was trembling with fear. He really didn't understand how the guy in front of him perfectly combined the two images of thirst for knowledge and the evil spirit.

Suddenly, Xu Yi's gaze swept to the thick bookshelf on the left wall. He rushed forward and began to search. Soon, he locked in a large piece of function-telling and began to work hard.

While he was flipping through and asking, he often had to reconstruct a lot of basic mathematical common sense when he started out. Once the construction was completed, his speed of flipping through the big ones was like counting money by the money counting machine.

In a blink of an eye, three hours passed, and Xu Yi seemed to have finished reading more than ten large books in a row. He also read the remaining books because they were not challenging and were not worth his study.

Suddenly, Xu Yi thought of the library, which had so many large numbers there, which condensed the crystallization of human wisdom in this world. When he looked at the middle-aged man with a greasy head, he suddenly felt that this person was a little unsuitable. It would be great if he could tie him to Chengtong and Tao Zhexuan. Unfortunately, the time was not enough, so he planned to tie an old professor first.

"Brother, who is the number one boss in the mathematics department in our school?"

Xu Yi stared at the middle-aged man with a greasy head.

The middle-aged man's eyes turned and understood what the person was thinking. He wanted Xu Yi to find someone else. As for what the other person would end up, he really couldn't control it. The scene in front of him was so terrifying. At worst, he could just call the police for the old professor after he ran away.

The middle-aged man was about to speak when the clouds in the sky outside suddenly tilted, and countless screams came. Xu Yi suddenly pulled the door open, and the sun suddenly smashed from the air to the ground, and the screams burst out.

At this moment, a sharp handprint came, and Xu Yi had no room to hide. He was hit by the big handprint, and his consciousness suddenly fell into darkness.

"I woke up, woke up, finally woke up..."

"The morning is like black hair and snow, and it is so painful to think hard."

"The energy system declines, and it is afraid that it will be nearly a hundred years old."

"Mr. Xu, are you okay..."

“…………”

The chaotic noises came to my ears, and Xu Yi opened his eyes and felt that his body was so heavy.

A few strands of silver hair covered, and he reached out to grab his hair, and was stunned by his hand, which was full of gullies and chicken skin.

He took out a mirror. In the mirror, he was as thin as firewood, with his face covered with ravines and his hair fluttering. He looked even older than the centenarian among ordinary people.

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To be continued...