In the math class, math teacher Chen Changyi was foaming at the problem and explaining the topic. Sweeping their gaze downward, many of the students were a little drowsy.

Chen Changyi knew that not long after the start of school, some students' minds had not yet kept their hearts from the happy life in the summer vacation.

It's already a junior in high school, and you guys don't know how serious they are. Although the warm weather in September and the afternoon do make it easy to fall asleep, these are the reasons why you don't listen?

Ah, who is that. It's called Yang Fan. Is this like a word? Do you still take my teacher's majesty in your eyes?

Okay, it's you, Chen Changyi's eyes lit up, and he decided to catch a typical example and deter these disobedient students.

A chalk head, crossed a graceful arc, right in Yang Fan's head. The students looked at the chalk and smiled.

Yang Fan felt something hit his head, scratched his head in a daze, and continued to sleep.

Chen Changyi's heart erupted with fire, his face was silent, and he approached and pretended to be enthusiastic: "Yang Fan, are you contemplating?"

The classmate behind him kicked his stool with his foot, shook it a few times in a row, but before he could react, he slammed it on his buttocks.

Yang Fan felt the pain, his buttocks shrunk a little bit, and he came to his senses. There was a burst of laughter in class.

"Classmate Yang Fan, did you hear what I said?" Chen Changyi knocked on the table.

"Oh, that Teacher Chen. Of course I do. Yang Fan immediately asked Lin Yuwei for help at the same table, wanting to hear what question the teacher asked just now.

The girl was expressionless and gave her a roll of her eyes.

Yang Fan, who didn't have a hint, was a little dazed, quietly thinking about how to reply.

Suddenly, a voice suddenly shouted in my head: The master system was activated, sensing the host's thirst for knowledge, and the master system came into being.

What's that? Anybody talking?

"The master system exists in quantum form, and through the communication of ideas, it will take four hundred years for earth technology. ”

This...... This...... What is this situation, is it true or false?

"The teacher asks you if you already know how to do the questions on the blackboard. Chen Changyi said.

"Teacher, I ......" smiling faces, especially the lover Qi Yueshu in the dream, who was also listed, and he couldn't really say anything like that.

"The first time the system is activated, you can experience the soul possession of all masters throughout the ages for an hour, please choose from the host. ”

While urging in a hurry, there was an opportunity in front of him, Yang Fan didn't care about anything else, his brain burned instantly, recalling the great mathematicians who appeared in history, no matter how he was, would it be more embarrassing than now?

"I chose Gauss, the mathematician. Yang Fan said silently in his heart.

"The choice is complete, and the mathematician Gauss is possessed for an hour. Maybe it's just a moment, maybe it's the eternity of a moment, when Yang Fan woke up again, there were suddenly countless memories in his mind.

"Teacher Chen, I will answer this question. At this time, Yang Fan was already possessed by Gauss. With this bit of math in high school, can you still stump him?

He calmly walked up to the podium, picked up the chalk, and without the slightest hesitation, in the whispers of his classmates, under Chen Changyi's incredible gaze, he finished it in one go in less than thirty seconds.

Throwing away the chalk casually, Yang Fan said, "Teacher, how is it, is the answer correct?"

Chen Changyi was stunned for a long time, and the classmates in the audience were also stunned, could it be that this guy was really listening to the lecture, just pretending to be sleeping, and the guy who secretly studied and pretended not to be serious was the most annoying.

Erased the questions and answers, Yang Fan didn't stop, and there was also a question on the blackboard:

The function f is defined on a set of positive integers: f(1) = 1; f(3)= 3; And for each positive integer n there is f(2n) = f(n), f(4n + 1) = 2f(2n + 1)- f(n). Try to determine the number of positive integers n that are less than or equal to 1988 and satisfy f(n)= n.

"I stumbled across this topic in a book, and I was just rehearsing it in my head, and I was a little distracted. Now I found some eyebrows, and the teacher and classmates helped to take a look together. ”

Yang Fan put his hands on his chest, calmly waiting for an answer.

The students looked at each other, this is a-for-tat. Don't worry about it for now, look at this topic, maybe you can do it.

The classroom fell silent, except for the sound of pen and paper.

Chen Changyi thought for more than ten minutes, but he didn't have a clue, and a drop of cold sweat dripped down his forehead.

Yang Fan felt that he had done enough, picked up the chalk, brushed a few times, and the problem was solved cleanly. And in the audience, the top-notch students just had some ideas, and they all looked at Yang Fan with wide eyes.

Bell...... Bell...... The sound of the end of class just sounded, Chen Changyi breathed a sigh of relief, picked up the handout, and said, "There is no time, get out of class." After speaking, he left in a hurry, and some sharp-eyed classmates looked at his back, and seemed a little embarrassed.

Yang Fan smiled faintly, and quietly walked to his seat and sat down under the curiosity of hunting. Lin Yuwei and Yang Fan at the same table collided with each other, and there was a small dodge, and there was an inexplicable light.

Yang Fan, who was not shocked, was very shocked at this time.

I pinched my face, and it hurt a little. And the memory in my mind is more sure that these are not illusory, at this time, any math problem, in my mind, is just a matter of time.

For the rest of the courses, Yang Fan was a little distracted. An hour passed, and the clever head was beaten back to its original shape.

Having tasted the sweetness, how could he endure this kind of gap. It's just that it's really not suitable for research at school, and he has been the first to run out of the classroom and go home after school at five o'clock, ignoring even the calls of a few close friends.