"You are all people who often take exams. I won't say anything unnecessary today."
"Anyway, don't even think about cheating."
"The professors and leaders of the college can monitor and watch."
nine in the morning.
In the differential equations examination room of Zhuoyue Building, the invigilator on the podium was unpacking the test papers and saying commonplace words to the candidates below.
In addition to determining whether students can graduate successfully, the final exam is also a reference for selecting scholarships and other benefits and honors. To ensure fairness, Jingzhou University has always been very vigorous in proctoring exams.
There is zero tolerance for cheating.
If you are discovered, you will at least get a punishment.
Serious cases will result in direct dismissal.
Just as the invigilator said, it seems like there are only one or two invigilators in the classroom, but in fact there may be an unknown number of people sitting behind the monitor. Sometimes the dean will even come and take a look.
Ensure the smooth conduct of the exam.
Unlike the freshman who still doesn’t understand the powerful relationship, the sophomore has experienced more exams, and as long as someone is not confused and can’t think about it, they will basically not do such trouble-seeking things.
After the test papers were taken out of the paper bag, they were quickly distributed.
Xu Yun maintained a calm and steady attitude. After getting the paper and writing the candidate information, he checked the question types.
At this moment, a familiar voice suddenly sounded in front of him.
"It's you again, classmate Xu Yun, how many minutes earlier do you plan to hand in the paper this time?"
Lift your gaze and look.
At some point the invigilator came over.
After taking a closer look, he realized that the other person was the statistics teacher who was supervising his mid-term exam.
Although he is only in his thirties and is considered a young lecturer at Beijing University, his teaching skills are not low.
In addition, as a female teacher with a gentle temper, she is very popular among students in class.
Xu Yun knew that he had left an impression on Xu Chongxing by submitting the paper early in order to catch up with Xu Chongxing's open class last time. However, there was no standard answer to this kind of question. After all, he didn't know the difficulty level before he could see the question.
He smiled politely and replied shyly: "I'm afraid it depends on the difficulty of the test paper."
"Then you have to work harder."
"Teacher, I wish you can break the last record." The invigilator specifically said this to Xu Yun, and then moved away from his position.
Although most of the people in the examination room except Xu Yun were sophomores, they knew Xu Yun.
Not to mention that Xu Yun has taken many professional courses with them. He has become a well-known figure in the school due to the popularity he caused on the Internet some time ago.
However, they all held back a strong desire in their hearts, that is, nothing could be done to make Xu Yun kill like he did in his freshman year.
Get the first place in grade.
As a sophomore in the 14th class, if they are held down and beaten by a freshman, how will they be able to hang out in the college in the future.
To this end, they held a private meeting in the group and finally handed over the task to a few people with the best grades.
So when I heard the conversation between Xu Yun and the invigilator, I couldn't help but grit my teeth subconsciously.
It's really too rampant.
Xu Yun didn't know what the seniors in the examination room were thinking. As the examination officially began, he quickly immersed himself in the test paper with the help of his concentration ability. He glanced up and captured the test questions in his mind like a camera, relying on various factors. Ability begins to parse.
Abstract thinking analyzes appearances to get to the essence.
Spatial thinking quickly builds mathematical models in the mind.
Numerical calculations yield results.
It is no exaggeration to say that he is now like a humanoid question answering computer.
There is no need to put pen to paper to calculate, the problem-solving ideas and answers are almost the same in your mind.
Just copy it down.
And this speed of answering questions is absolutely unmatched by others.
The differential equations test paper of the Department of Mathematics at Peking University is relatively neat, with only two large blocks in total.
Calculation problems and solution problems.
As for the difficulty, it is similar to the big questions in previous years.
The prescribed time for answering questions was two hours, and Xu Yunxiao completed 90% of the test paper in just a few dozen minutes.
Only the last big question remains.
"Suppose f(x) is continuous, and the curve y=f(x) is a convex arc segment connecting A(0,1) and B(0,1)..."
"p(x, y) is any upper point..."
When the question came into view, he knew it was a differential equation problem.
"Find the equation of the curve?"
"It's not difficult."
I muttered something to myself, and immediately substituted the data in the question into my mind to generate a graph. As my ideas for solving the problem gradually became clearer, I immediately started writing.
Subtract the area of the trapezoid from the area of the arc segment to get the equation.
Then derive the derivative of both sides with respect to X.
Simplification.
Solve differential equations.
He quickly finished 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 prescribed handover time.
Just when he was hesitating whether to hand in the paper in advance, his eyes fell on the steps to solve the problem in 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 not try them all?"
Thinking that it would be time to hand in the paper early and it would be time to eat, it would be better to try to write out all the solutions to the big questions on the test paper.
Take a look and find out how many.
Doing so can also better diverge your thinking and increase your understanding of relevant content.
There was definitely no second way to solve the problem in the test paper, so he took out his draft book and studied it carefully.
After a while, two more ideas for solving the problem were determined.
As he gradually immersed himself in it, his own personality that likes to face challenges came out, and he had to find all the solutions to the problems even if he fell into deep thought.
…
Zhang Xiaoyuan is a sophomore majoring in mathematics and applied mathematics in the Department of Mathematics.
When he was a sophomore in high school, he was recommended to Beijing University because of his outstanding talent.
He is about the same age as Xu Yun, and he also maintains the first place in his grade.
Because Xu Yun studied the sophomore-level professional courses in advance and took the final exam with them, in this case, he, a top student, had to stand up and defend the dignity of his seniors.
This is also the high hope that others in the department have placed on him.
But he had to admit that he was not completely sure of himself and was not sure whether his final exam score could surpass Xu Yun.
After all, Xu Yun's aura in the past six months has been too dazzling.
Whether publishing a paper in the first section of the Academy of Sciences, or independently developing image restoration software and setting up a company.
He doesn't have it yet.
The only thing he could prove was that he had already completed all the courses in his sophomore year.
Logically speaking, he should be better than Xu Yun in solving problems.
Originally, he was worried that Xu Yun would hand in the paper before him, and he felt a little nervous. However, he did not expect that after he finished writing the paper, Xu Yun was still immersed in solving the questions with a solemn expression.
"It's not finished 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."
After all, Xu Yun has only been on campus for half a year. It is already very difficult for him to teach himself advanced algebra and analytical geometry. It is completely understandable that he does not have a deep grasp of ordinary differential equations as a sophomore.
He breathed a sigh of relief when his thoughts stopped here, and the pressure of defending the senior's authority disappeared instantly.
Originally, he planned to hand in the paper in advance, but now he has no idea.
Sitting in the seat, always paying attention to Xu Yun's performance.
Seeing that Xu Yun was still immersed in calculations until he handed in the paper, he finally felt completely at ease.
This time the honor of being number one in the grade must belong to him.
In the next few exams, Zhang Xiaoyuan continued his previous practice. After finishing the exam papers, he turned his attention to Xu Yun and observed that Xu Yun was still calculating the time for handing in the papers every time. This made him more certain that Xu Yun was a new student. My mastery of the course content in my sophomore year is not strong enough. So when you encounter big questions, you will get stuck and waste a lot of time.
Perhaps because he was relieved of the pressure, he took the initiative to talk to Xu Yun after the last exam.
"Hello, classmate."
"I am a sophomore majoring in Mathematics and Applied Mathematics."
"Hello, senior."
Xu Yun asked the company to book a ticket for him to return to Pingzhou today. After the exam, he was about to go back to the dormitory to pack his things, but he was stopped by a boy wearing black-rimmed glasses.
Thinking of reaching out so as not to hit the smiling man, he paused and said hello.
"This year's exam questions are indeed a little more difficult. I finished them half an hour early."
"Junior, you don't have to think too much."
"See you next year."
After patiently listening to what the other party said, several question marks suddenly appeared in Xu Yun's mind.
"what's the situation?"
"Is this year's question difficult?"
He recalled the big questions he had done and couldn't find any that could be called difficult.
However, he found only three or four solutions to each question at most, which made him quite unwilling.
Just as he was about to respond, he saw that the other party had already turned around and left.
"baffling."
He murmured softly and just dismissed it as a small incident and didn't want to think too much about it.
Not long after I returned to the dormitory, I saw Qian Yudong, Zhao Yuefeng, Zhou Qi and the others had packed their things, with several suitcases parked in the middle.
"Xu Yun is back, then I will go to the station to catch the train ahead of you."
"Bros."
"See you next year."
When Qian Yudong saw Xu Yun, he stopped lingering and wasted time. After speaking, he picked up his suitcase and walked out of the dormitory.
Seeing this, Zhao Yuefeng hurriedly stuck his head out and shouted: "Remember to bring us some local specialties, Brother Dong."
Qian Yudong raised his hand and made a no-questions-asked gesture, and quickly disappeared from sight without stopping.
Then Zhao Yuefeng and Zhou Qi also left one after another. Xu Yun stayed alone in the dormitory to pack his things, then locked the dormitory door and started on the way home.
Take a bus from the station to Pingzhou City, then transfer to a bus to Yuanshan County and get off halfway.
Because of the short distance, we arrived at the greeting station before it got dark.
Xu Yun got off the car with her luggage. As soon as she raised her eyes, she saw her mother standing by the tram not far away. Even though the weather was approaching subzero, she still couldn't hide the joyful smile on her face when she saw her son.
Before going home, he told his mother the approximate time of his arrival, and specifically asked not to come too early.
But now it seems that I might have to stand there for a while.
He hurriedly walked towards his mother with his luggage. When he got closer, his eyes first fell on her body. He frowned slightly and said, "Are you wearing thick clothes? It's been very cold outside these days to cool down."
"Don't worry about it."
"Mom is a child and doesn't know how to add clothes." Wang Chunfang glanced at her son and immediately said, "Get in the car quickly, it will get dark later."
…
(End of chapter)
