"You are all people who often take exams, so I won't talk about anything extra today."

"Anyway, don't think about cheating."

"The professors and leaders of the academy can monitor it."

Nine a.m.

In the examination room of the Excellence Building, the invigilator on the podium unsealed the test papers and rushed to the candidates to speak clichés.

In addition to whether the final exam is related to whether you can successfully graduate, it is also a reference item for the selection of welfare honors such as scholarships.

Zero tolerance for cheating.

If they are discovered, they will be punished at least once.

If it is serious, it will be directly expelled.

As the invigilator said, it seems that there are only one or two invigilators in the classroom, but in fact, there are many people sitting in the back, and sometimes the dean will even come to take a look.

Ensure the smooth running of the exam.

Unlike the freshman year, who didn't understand the powerful relationship in it, the sophomore year experienced a lot of exams, and as long as no one was confused and couldn't think about it, he basically wouldn't do this kind of trouble-seeking thing.

Once the test papers are taken out of the paper bag, they are quickly distributed.

Xu Yun maintained a calm and steady attitude, and checked the question type after getting the paper and writing the candidate's information.

At this moment, a familiar voice suddenly sounded in front of him.

"It's you again, classmate Xu Yun, how many minutes early do you plan to hand in the paper this time?"

Look up.

I don't know when the invigilator came over.

After a closer look, he realized that the other party was the statistics teacher who invigilated him in the mid-term.

Although he is only in his thirties, he is a young lecturer at Beijing University, but his level of teaching is not low.

In addition, as a female teacher, she has a gentle temper and is very popular with students in class.

Xu Yun knew that in order to catch up with Xu Chongxing's open class last time, he had left an impression on the other party by handing in the paper in advance, but there was no standard answer to this kind of question, after all, he hadn't had time to see the difficulty of the question.

He smiled politely and replied shyly, "I am afraid that it depends on the difficulty of the test paper." ”

"Then you have to come on."

"Teacher, I wish you to break the record last time." The invigilator deliberately said this to Xu Yun, and then moved his steps to leave his position.

Except for Xu Yun, most of the students in the examination room knew Xu Yun.

Not to mention that Xu Yun followed them to a lot of professional classes, and the popularity that made a splash on the Internet some time ago has also become a well-known figure in the school.

However, they all held back a lot of strength in their hearts, that is, they couldn't say anything to make Xu Yun kill like he did in his freshman year.

Get the first place in the grade.

As a sophomore in the 14th class, if he is beaten by a freshman, how will they mix in the college in the future.

For this reason, they held a private meeting in the group, and finally handed over the task to a few people with the best grades.

Therefore, when I heard the conversation between Xu Yun and the invigilator, I couldn't help but clench my teeth subconsciously.

It's just so rampant.

Xu Yun didn't know what these seniors in the examination room thought, as the exam officially began, with the help of his concentration ability, the whole person quickly immersed himself in the test paper, and his eyes swept up, like a camera, the test questions were reflected in his mind, relying on various abilities to begin to analyze.

Abstract thinking dissects the appearance and goes straight to the essence.

Spatial thinking quickly builds mathematical models in the mind.

The numbers are calculated to give the result.

It's no exaggeration to say that he's now like a humanoid computer.

You don't need to do any special calculations, and you will calculate the solution ideas and answers in your mind.

All you need to do is copy it.

And this kind of speed is absolutely incomparable to others.

The differential equation test paper in the Department of Mathematics of Beijing University is relatively neat, with only two large blocks in total.

Calculation and solution questions.

As for the difficulty, it is similar to the big questions of previous years.

With a two-hour time limit for answering questions, Xu Yun completed 90% of the content of the test paper in dozens of minutes.

Only one last big question remains.

"Let f(x) be continuous, and the curve y=f(x) is the convex arc connecting A(0,1) and B(0,1......)"

"p(x,y) is the ...... of any of its last points"

When the problem came into view, he knew it was a problem for differential equations.

"Find the equation for a curve?"

"It's not that hard."

I muttered to myself in my heart, and the data in the question was suddenly generated in my mind, and the idea of solving the problem gradually became clear, and I immediately started to write.

The equation is obtained by subtracting the trapezoidal area from the area of the arc graph.

Then both sides find a derivative of X.

Simplify.

Solve differential equations.

Quickly finishing the entire test paper, he first looked up at the time on the wall and found that there was still a long time before the required time to hand in the paper.

Just when he was hesitating whether to hand in the paper in advance, his eyes fell on the steps of solving the test paper, and he suddenly felt that there was a better solution to this question, and he immediately became interested.

"Is there more than one solution, why don't you try them all?"

Thinking that it is not time to eat to hand in the paper in advance, it is better to try to write down all the solutions to the big questions on the test paper.

Let's see exactly how many of them are found.

Doing so will also allow you to think differently and increase your understanding of the relevant content.

The second method of solving the problem could not be written in the test paper, so he took out the draft book and studied it carefully.

After a short time, two more ways to solve the problem were determined.

As he gradually immersed himself in it, his own personality of taking on challenges was stimulated, and even if he was deep in thought, he had to find all the ways to solve the problem.

……

Xiaoyuan Zhang is a sophomore majoring in Mathematics and Applied Mathematics in the Department of Mathematics.

In his sophomore year of high school, he was sent to Beijing University because of his outstanding talent.

He is about the same age as Xu Yun, and he also maintains the first grade in his grade.

Because Xu Yun studied the sophomore professional courses in advance and followed them to take the final exam, in this case, it was necessary for him, a top student, to stand up and maintain the majesty of his seniors.

This is also the high hope that the rest of the department places on him.

But he has to admit that he is not completely sure of himself, and he is not sure whether he can surpass Xu Yun in the final exam.

After all, Xu Yun's aura in the past six months is too dazzling.

Whether it is publishing papers in the first division of the Academy of Sciences, or independently developing image restoration software to establish a company.

He doesn't have it yet.

The only thing he can do is that he has already completed all the courses in his sophomore year.

It stands to reason that he should be stronger than Xu Yun in doing questions.

Originally, he was worried that Xu Yun would hand in the paper before him, and he was a little nervous, but he didn't expect that after he finished writing the test paper, Xu Yun was still immersed in calculating the questions, and his expression was very solemn.

"Isn't it done yet?"

"Could it be that I was stumped by the big question?" Zhang Xiaoyuan looked at Xu Yun, and this thought suddenly appeared in his mind.

Then he nodded and affirmed himself.

"I guess so."

Thinking that Xu Yun has only been on campus for half a year after all, it is not easy to learn high algebraic and analytic geometry on his own, and it is completely understandable that he does not have a deep grasp of sophomore ordinary differential equations.

The thought stopped here, and he suddenly breathed a sigh of relief, and the pressure to defend the prestige of the senior disappeared in an instant.

Originally, he planned to submit the paper in advance, but now he has no such idea.

Sitting in the seat, always pay attention to Xu Yun's performance.

Seeing that Xu Yun was still working hard until the handing over of the papers, his heart finally settled down completely.

The honor of being the first in the grade this time must belong to him.

In the next few exams, Zhang Xiaoyuan continued the previous practice, and after writing the test papers, he focused on Xu Yun to observe, and found that every time Xu Yun handed in the papers, he was still calculating, which made him more sure that Xu Yun, as a freshman, did not have a firm grasp of the sophomore course content. Therefore, when encountering a big problem, it will get stuck and waste a lot of time.

Maybe there was no pressure in his heart, and when the last exam was over, he took the initiative to talk to Xu Yun.

"Hello classmates."

"I'm a sophomore majoring in Mathematics and Applied Mathematics."

"Hello senior."

Xu Yun asked the company to help him book a ticket to return to Pingzhou today, and he was about to go back to the dormitory to pack his things after the exam, but he was stopped by a boy wearing black-rimmed glasses.

Thinking of reaching out and not hitting the smiling man, he paused and said hello.

"This year's exam questions are indeed a little difficult, and I finished them half an hour early."

"Junior brother doesn't have to think too much."

"We'll see you next year."

After patiently listening to the other party's words, a few question marks suddenly appeared in Xu Yun's mind.

"What's the situation?"

"Is it difficult this year?"

He revisited the big questions he had done, and he couldn't find any one that could be called difficult.

However, he only found three or four solutions to each problem at most, which made him quite unwilling.

I just wanted to open my mouth to respond, but I saw that the other party had already turned away.

"Inexplicable."

muttered softly in his mouth, and he was too lazy to think about it as a vignette.

After a while, I returned to the dormitory and saw Qian Yudong, Zhao Yuefeng and Zhou Qi that they had already packed their things, and there were a few suitcases parked in the middle.

"Xu Yun is back, then I will go to the station to catch the train before you."

"Brothers."

"We'll see you in a year."

When Qian Yudong saw Xu Yun, he didn't continue to linger and delay time, and after speaking, he picked up his suitcase and walked outside the dormitory.

Seeing this, Zhao Yuefeng hurriedly poked his head out and shouted, "Remember to bring us a souvenir Brother Dong." ”

Qian Yudong raised his hand and made a gesture that was okay, and soon disappeared from sight without stopping.

Then Zhao Yuefeng and Zhou Qi also left one after another, and Xu Yun stayed alone in the dormitory to pack up his things, and then locked the dormitory door and embarked on the road home.

From the station, take a bus to Pingzhou City, then transfer to a bus to Yuanshan County and get off at the halfway point.

Because of the proximity, we arrived at the hailing station before it got dark.

Xu Yun got off the car with his luggage, and as soon as he raised his eyes, he saw his mother standing next to the tram not far away, although the weather had begun to approach sub-zero, he still couldn't hide the happy smile on his face when he saw his son.

Before going home, he told his mother about the approximate time of his arrival, and specially told him not to come too early.

But now it seems that I am afraid that I will stand for a while.

Hurriedly took the luggage and walked quickly towards his mother, his eyes fell on his mother's body first, and he frowned slightly and said, "It's not thick to wear, it's cold outside these days." ”

"Don't worry about it."

"When a mother is a child, she doesn't know how to add clothes." Wang Chunfang glanced at his son and immediately beckoned: "Hurry up and get in the car, it will be dark later." ”

……

(End of chapter)