Yao Leyi was about to sit down again when she suddenly heard Xu Yun's words and her body suddenly stopped, and she turned her head with surprise in her eyes.
She knew that Xu Yun was studying advanced algebra during military training, but that was basic knowledge at most.
It is still far from solving the problem.
If you can memorize multiplication tables, can you calculate addition, subtraction, multiplication and division?
not necessarily.
Besides, this is her postgraduate entrance exam review textbook.
Thinking that Xu Yun might have good intentions, he smiled and thanked him after sitting on the chair.
"Thank you junior for your kindness."
Then he declined politely: "But no, I'll just go back and ask a senior for advice." I was worried that if I asked Xu Yun for advice on a question, they would not be able to solve it and embarrass both of us.
Xu Yun could more or less guess what Yao Leyi was thinking, so he did not insist on what he just said.
He raised his hand to reveal the cover of the collection of exercises in front of him, and then changed a new entry point and said: "I am also doing exercises during this period, maybe it will be the type I have encountered. If you really can't solve it, you can go again. The same goes for asking seniors for advice.”
Yao Leyi examined Xu Yun's expression and saw that he was very serious and not joking.
After a slight hesitation, he agreed.
"Oh well."
After saying that and handing over the draft book, I thought that if an embarrassing situation really happened, I would just speak up and smooth things over.
Don't look at the monk's face and look at the Buddha's face.
You can't tell Xu Yun not to come to Taiwan in front of Chen Shihe.
Xu Yun took the draft from Yao Leyi and immediately looked carefully at the questions copied from it.
"Suppose the vector spaces a, b, and c are not coplanar, prove that any vector r in the space can be expressed as..."
It is a proof question related to vectors.
Not difficult.
Relying on the spatial thinking that improved by 25%, the corresponding graphics were constructed in my mind after reading the questions, and the problem-solving ideas quickly became clear.
After making sure that there was no problem with the process, he picked up a pen and started calculating the steps in his draft book.
And explained it carefully to Yao Leyi.
"Senior."
"This question is actually quite easy to prove by finding the right method."
Yao Leyi didn't expect much from Xu Yun, so she looked a little stunned when she suddenly heard this sentence.
Quite easy?
It's hard, okay?
But just as he was about to open his mouth to refute, he suddenly stopped when he heard Xu Yun talk about his ideas for solving the problem.
"Use algebra to prove, first set these vectors and the coordinates of r."
"Equations in a column of variables."
"Change the determinant and observe its geometric meaning."
…
Originally, she didn't quite understand this question, but after listening to Xu Yun's explanation and the formula calculation steps in the draft book, she quickly grasped the most important line, and her whole body suddenly felt like the clouds had cleared. The refreshing feeling of seeing the blue sky.
But after she quickly came to her senses, she had a very strange look on her face.
Watch Xu Yun carefully with eyes full of curiosity.
I couldn't figure out why Xu Yun could solve problems that he obviously didn't learn, and I was also surprised that I understood the questions so quickly after listening to Xu Yun's lecture.
Her personality is more free and straightforward compared to Chen Shihe, and it is impossible for her to pretend to be in the dormitory with a few questions.
Seeing Xu Yun finish writing the last symbol, he immediately asked: "The progress of your professional courses should not be so fast. Don't tell me that you learned this knowledge by yourself?"
"It's true that I taught myself." Xu Yun nodded and admitted generously.
And these words undoubtedly caused tons of harm to Yao Leyi, and she just felt a little aggrieved for no reason.
He raised his gaze and looked at Chen Shihe across from him and said, "Shihe, I suddenly don't want to take the postgraduate entrance examination."
Thinking that I have studied high-level mathematics for three years, and have been reviewing for the postgraduate entrance examination in recent months, the result is not as good as others who have studied by themselves for just a few days. How poor is my talent in mathematics!
Fortunately, she didn't think twice about applying for the mathematics department.
Chen Shihe also listened to Xu Yun's lecture and had to admit that there were indeed many merits in it.
It even made her feel enlightened.
But more than anything, I am happy that Xu Yun has such a strong mathematical talent.
"Xu Yun."
"I didn't expect your math talent to be so good."
“I have already mastered the content of mathematics majors not long after the semester started.”
"I'm sure you can go far in mathematics."
Xu Yun was naturally very happy to be praised by the perfect sister next door in his childhood.
Fortunately, Yao Leyi did not take out questions such as ordinary differential equations and complex functions, which are only learned in the sophomore year.
Otherwise, he would be blind.
Therefore, he answered with a little humility: "I have only learned this year's course."
Yao Leyi was already sad, but she felt even more aggrieved when she saw Chen Shihe and her brother and sister chatting.
Immediately he shouted again in a long tone.
"Shihe~"
Chen Shihe obviously knew the character of his best friend. He turned his head and said helplessly after hearing this long sound: "I have been reviewing for such a long time, and I will officially register soon. No matter what, I will not allow you to give up our agreement midway."
Yao Leyi was hit hard all of a sudden, and the expression on her face was as aggrieved as possible.
Seeing this, Chen Shihe couldn't help but feel a little soft-hearted. After thinking about it, he decided to contribute his younger brother.
"Advanced mathematics is indeed difficult for us non-mathematics students, but since Xu Yun is very talented in this area, we can ask him for advice if we encounter problems."
Being reminded by Chen Shihe, Yao Leyi immediately thought of something.
He quickly put away his expression and looked at Xu Yun and asked curiously: "I forgot to ask you just now. Why can I understand what you said, but others just listen to it from heaven?"
Of course, Xu Yun could not tell the other party that this was because his abstract thinking and spatial thinking abilities had improved. When faced with a problem, he could quickly find the key points and simplify other unimportant things. This way, it would naturally be easier to understand.
Fortunately, he already had a way of answering questions like this, and he could organize his words and answer them softly.
"Maybe it's because I often discussed topics with my classmates in high school, and I also worked as a tutor for a period of time during the summer vacation."
"Knowing how to speak can make it easier for listeners to understand. You will master this method over time."
"So that's it." Yao Leyi thought thoughtfully.
The next second, she suddenly moved her body closer to Xu Yun, and said with a pleading tone: "You are so good at giving lectures. If Shihe and I encounter advanced math questions that we don't understand in the future, can we ask you directly for advice?"
It seemed that he was afraid that Xu Yun would disagree, so he brought Chen Shihe with him.
"You can agree if it's convenient for you." At this time, Chen Shihe noticed Xu Yun's embarrassment and whispered beside him.
What Xu Yun is not afraid of the most is giving lectures to others, not to mention helping Chen Shihe and Yao Leyi review for the postgraduate entrance examination. Logically speaking, there is no reason to refuse.
The key point is that the mathematics knowledge he currently has is limited to the freshman level, and his help to them in the postgraduate entrance examination is still limited.
In this case he had no choice but to tell the truth.
"The lecture topic is okay, but it can only be limited to the content of professional courses in the freshman year."
He originally thought that Yao Leyi would be indifferent when he heard this. Who would have thought that this college girl would be ruthless when she opened her mouth.
"Then you should hurry up and learn the contents of the sophomore year."
"Anyway, you are so talented in mathematics, why don't you just wait until you finish learning and teach us."
"It's still some time before the postgraduate entrance examination starts."
Xu Yun never expected that he would have another reason to study sophomore level courses today.
But for this reason, I have to accept it temporarily.
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 is inconvenient in the future.
After solving the vector proof problem for Yao Leyi, his task progress was finally reduced to single digits, and it took him another ten minutes to finally get it all together.
Almost as soon as he finished writing the last line, a familiar panel appeared in front of him.
"Congratulations to the host for completing the advanced mission and obtaining the master achievement. The mission reward has been distributed."
As various attribute information came into view, one could see that the points column returned to three digits again, and that special cooling sensation appeared near the temples, lasting several seconds longer than last time before disappearing.
This marks that his spatial thinking ability has improved by 50%.
If before he could only construct graphics in his mind, now it was enough to construct function models directly without the help of a computer.
And the speed is not too slow.
He can even be sure that if he were to turn on his brain overclocking now to master mathematics professional knowledge, the points consumed would definitely be much less than before.
Because his abilities have been greatly improved, learning new things will be faster and easier.
Naturally, there is no need to spend a lot of points.
Perhaps because of the successful completion of the advanced mission, Xu Yun was in a happy mood and did not wait until the museum closed.
Before nine o'clock, I separated from Chen Shihe and the others, went to the administrator to borrow some new textbooks, and bought some food on the way back to the dormitory.
It’s also worth mentioning that I don’t know if it’s because he has mastered the content of the mathematics major course in his freshman year, but he has been unable to complete the task in the past few days whether he is studying or doing questions.
The pressure suddenly disappeared from his body, but he seemed a little uncomfortable.
…
Time flies by and it’s Friday in the blink of an eye.
In the last class of spatial analytic geometry in the morning, Xu Yun sat in the last row, immersed in reading the textbooks borrowed from the library.
The whole situation is no different from when I was a high school substitute class.
In fact, he still needed to listen carefully at the beginning, but he didn't know what Tang Yanshan explained.
He soon became free.
After all, although Tang Yanshan teaches senior students, he is still relatively senior in the mathematics department, and other lecturers must give some face to their professors.
At this moment, Xu Yun suddenly noticed that the screen of his mobile phone on the desktop lit up automatically, displaying a familiar note message.
"Professor Zhou's phone number."
"Is it possible that the paper has been revised?"
Almost as soon as he saw the name, an idea popped into his mind.
His mobile phone was on silent during class hours, and it was not a good time to answer the phone, so he had to hold back his excitement and excitement for the time being and sent a message to Zhou Zhi first.
(End of chapter)
