Yao Leyi was about to sit down again, when she suddenly heard Xu Yun's words, her body slammed, and she turned her head with surprise in her eyes.

She knew that Xu Yun was learning advanced algebra when he was in military training, but that was at most the basics.

It's still far from solving.

Can I calculate addition, subtraction, multiplication and division by memorizing the multiplication formula?

Not necessarily.

Besides, this is still a textbook for her graduate school entrance examination.

Thinking that Xu Yun might be out of kindness, he smiled and thanked him after sitting on the chair.

"Thank you, junior, for your kindness."

Then politely refused: "But no need, I'll just go back and ask a senior for advice." "I'm worried that I really ask Xu Yun for advice with the question, and I won't be able to solve it when the time comes, which will embarrass each other.

Xu Yun could somewhat guess Yao Leyi's thoughts, but he didn't continue to insist on what he just said.

Raising his hand to reveal the cover of the exercise collection in front of him, he then changed a new entry point and said: "I have also been doing exercises during this time, maybe it will be the type I have encountered, if you can't solve it, you can go to the senior for advice." ”

Yao Leyi looked at Xu Yun's expression and saw that he was very serious, not like he was joking.

After a little hesitation, I chose to agree.

"Okay then."

After saying that, he handed over the sketchbook, and thought to himself that if there was an embarrassing scene, he would open his mouth to make a round.

Don't look at the face of the monk and look at the face of the Buddha.

You can't let Xu Yun not come to the stage in front of Chen Shihe.

Xu Yun took the draft book from Yao Leyi's hand, and immediately carefully checked the questions copied on it.

"Let the vector spaces a, b, and c be non-coplanar, and prove that any vector r in the space can be represented as ......"

It is a vector-related proof problem.

It's not hard.

Relying on the spatial thinking after improving by 25%, the corresponding graphics were constructed in my mind after reading the questions, and the ideas for solving the problems were quickly clear.

After making sure that there was no problem with the process, he picked up his pen and calculated it step by step on the sketchbook.

and carefully explained to Yao Leyi.

"Senpai."

"It's actually quite easy to find the right way to solve this problem."

Yao Leyi didn't expect much from Xu Yun, so that her expression was a little stunned when she suddenly heard this.

Easy?

It's hard to be good or not.

But just as he was about to open his mouth to refute, he heard Xu Yun talk about the idea of solving the problem, and his actions stopped all of a sudden.

"To use algebra to prove, first set these vectors and the coordinates of r."

"Column Variable Equations."

"Swap the determinant and look at its geometric significance."

……

Originally, she didn't understand this question well, but listening to Xu Yun's explanation and the formula calculation steps in the sketchbook, she quickly grasped the most important line, and the whole person suddenly had a pleasant feeling of clearing the clouds and seeing the blue sky.

It's just that when she came back to her senses quickly, there was a very strange look on her face.

looked at Xu Yun carefully, his eyes full of curiosity.

I couldn't figure out why Xu Yun could solve the questions that he obviously didn't learn, and I wondered that I understood the topics so quickly after listening to Xu Yun's lectures.

Her personality is more free and straightforward than Chen Shihe, and it is impossible to pretend to have a few questions about the dormitory.

Seeing that Xu Yun finished writing the last symbol, he immediately asked: "The progress of your professional course should not be so fast, don't tell me that you taught this knowledge by yourself?" ”

"I really taught myself." Xu Yun nodded and generously acknowledged.

And this sentence undoubtedly caused tons of harm to Yao Leyi, and she only felt inexplicably aggrieved in her heart.

Raising his gaze to look at Chen Shihe opposite, he said, "Shihe, I suddenly don't want to take the postgraduate entrance examination." ”

Thinking that I have studied high mathematics for three years, and I have been reviewing and preparing for the graduate school entrance examination in recent months, the result is not as good as self-study for so many days, how bad this talent in mathematics should be!

Fortunately, she didn't think about applying for the mathematics department at the beginning.

Chen Shihe also heard Xu Yun's lecture process, and had to admit that there were indeed many merits in it.

It even made her a little stunned.

But more than that, I was happy that Xu Yun had such a strong talent for mathematics.

"Xu Yun."

"I didn't expect you to be so talented in math."

"Not long after the start of school, I have already mastered the content of mathematics courses."

"I'm sure you'll be able to go far in math."

was praised by the perfect sister next door in his heart when he was a child, Xu Yun was naturally very happy in his heart.

However, it is fortunate that Yao Leyi did not come up with ordinary differential equations and complex variable functions, which are the types of questions that sophomore students only learned.

Otherwise, he will be blind.

Therefore, he replied a little modestly: "I have only studied this year's course." ”

Yao Leyi was already sad, but when she saw Chen Shihe and her sister and brother chatting, she felt even more aggrieved.

Immediately dragged a long note and shouted softly.

"Shihe~"

Chen Shihe obviously knew the character of his best friend, and when he heard this long voice, he turned his head and said helplessly: "I've been reviewing for so long, and I'm about to officially sign up, no matter what, I won't allow you to give up our agreement halfway." ”

Yao Leyi was poked at the point all of a sudden, and the small expression on her face was as aggrieved as she was.

Seeing this, Chen Shihe couldn't help but feel a little soft-hearted, and after thinking about it, he decided to contribute his younger brother.

"High math is really difficult for us non-math students, but since Xu Yun is very talented in this area, we can ask him for advice if we encounter any problems."

was reminded by Chen Shihe like this, Yao Leyi immediately thought of something.

quickly put away his expression and looked at Xu Yun curiously: "I forgot to ask you just now, why can I understand what you said, and when others are listening, it will become a book of heaven?" ”

Of course, Xu Yun couldn't tell the other party that this was because of his improved abstract thinking and spatial thinking skills, and he was able to quickly find the key points and simplify other unimportant things when facing problems, so it was naturally easier to understand.

Fortunately, he already had a set of rhetoric for questions like this, and he answered softly with a little organization of language.

"Maybe it's because I used to talk to my classmates in high school, and I worked as a tutor for a while during the summer vacation."

"Knowing how to speak makes it easier for the listener to understand, and it takes a long time to master this method."

"I see." Yao Leyi was thoughtful.

The next second, I saw her suddenly move her body close to Xu Yun, and said with a sense of request: "You are so good at lecturing on the topic, if Shi He and I encounter a high math question that we don't understand in the future, can we ask you directly for advice?" ”

seemed to be afraid that Xu Yun would not agree, so he specially brought Chen Shihe.

"If it's convenient for you, you can agree." At this time, Chen Shihe noticed Xu Yun's embarrassment, so he whispered a sentence next to him.

The last thing Xu Yun is afraid of is to give lectures to others, not to mention helping Chen Shihe and Yao Leyi to review for the postgraduate entrance examination, it stands to reason that there is no reason to refuse.

The key is that his current knowledge of mathematics is limited to the freshman year, and the help they can play for the graduate school entrance examination is still limited.

In this case, he had no choice but to tell the truth.

"It's okay to talk about the topic, but it can only be limited to the content of the professional course in the freshman year."

He thought that Yao Leyi would say that it didn't matter when he heard this, who would have thought that this college sister would be ruthless when she opened her mouth.

"Then you hurry up and learn the content of the sophomore year."

"Anyway, you're so talented in math, why don't you just teach us when you're done."

"It's still a while before the graduate school entrance examination starts."

Xu Yun never expected that he would have another reason to study the sophomore course today.

But when it comes to this, I have to do it for the time being.

In the next time, Yao Leyi took the initiative to add his friends and pulled the three of them into the same group.

I plan to ask questions in the group if it's inconvenient in the future.

After answering the vector proof problem for Yao Leyi, his task progress was finally only in single digits, and it took more than ten minutes to finally make it all up.

Almost as soon as he finished writing the last line, the familiar panel immediately appeared in front of his eyes.

"Congratulations to the host for completing the advanced quest and obtaining the Grandmaster achievement, and the quest reward has been distributed."

As the attribute information came into view, I could see that the score bar had returned to three digits again, and a special feeling of coolness appeared near the temples, which lasted for a few seconds compared to the last time before disappearing.

This marks a 50 percent improvement in his spatial thinking skills.

If previously he could only build graphs in his head, now it is enough to directly architect functional models without the help of computers.

And it's not too slow.

He can even be sure that if he turns on brain overclocking to master the knowledge of mathematics now, the points consumed will definitely be much less than before.

Because his abilities have improved dramatically, it will be quicker and easier to learn new things.

Naturally, there is no need to consume a lot of points.

It may be because of the successful completion of the advanced task, Xu Yun was happy and did not deliberately wait until the museum closed.

Before nine o'clock, he separated from Chen Shihe and the others, went to the administrator to borrow a few new textbooks, and bought some food on the way to return to the dormitory.

In addition, it is worth mentioning that I don't know if it is because he has mastered the content of the mathematics major course in the freshman year, and he has not been able to generate tasks in the past few days, whether he studies or does problems.

There was no pressure under him all of a sudden, but he looked a little uncomfortable.

……

As the clock ticked by, it was Friday in the blink of an eye.

In the last class of spatial analytic geometry in the morning, Xu Yun sat in the back row, looking at the textbooks borrowed from the library.

The whole state is no different from when I was substitute teaching in high school.

In fact, at the beginning, he still needed to listen carefully, but he didn't know what Tang Yanshan explained.

He soon became free.

After all, although Tang Yanshan teaches Gao Dai, his qualifications in the Department of Mathematics are still relatively old, and other lecturers and professors always have to give face.

At this moment, Xu Yun suddenly noticed that the mobile phone screen placed on the desktop automatically lit up, showing a familiar note message.

"Professor Zhou's phone number."

"Could it be that the paper has already been revised?"

Almost as soon as he saw the name, such a thought popped into his mind.

His mobile phone was silent during class time, and it was not suitable to answer the phone at this time, so he had to temporarily hold back the excitement and excitement in his heart and send a message to Zhou Zhi first.

(End of chapter)