Happy time is always short-lived.
Li Mu realized the meaning of this sentence for the first time during the learning process.
He started reading at 6:40 in the morning and didn't seem to come back to his senses until the library opened at 8 o'clock. Then after entering the library, time passed like water.
Library-canteen-library-canteen-library-dormitory.
That’s it for a day trip.
In Li Mu's perception, it seemed that he had never experienced such a fast day in his life.
"Lao Li, you are really awesome."
Back in the dormitory, Zhang Lei and others surrounded Li Mu.
"How did you manage to read for a whole day?"
"Can you share your tips?"
The three of them saw with their own eyes that Li Mu never put down the book at all.
On the other hand, they did not come to the library in the afternoon, and they only returned to the library after dinner. Although they stayed in the library for a full eight or nine hours, in fact There were also two or three hours spent in a daze or playing with mobile phones.
When he heard their questions, Li Mu touched his nose and said, "Just look at it like that, what's the trick?"
"Can you read a book like calculus?"
"Uh..." Li Mu asked doubtfully, "Don't you think reading is a very happy thing?"
Zhang Lei, Xu Sheng, Chen Kaiming: "..."
"You've changed, Gouzi. "
The three of them shook their heads and scattered back to their seats.
They have no common language with Gouzi.
Li Mu smiled calmly.
The dog has not changed, but his mind has changed.
…
A night of silence.
Arrive as promised the next day.
Of course, there is also a small test on multivariable calculus as scheduled.
Before the third class in the morning, more than thirty students from Class 1 of the Physics Department were already sitting in the classroom, one person at a table.
"As we said last week, there will be a small test in this week's class to test how well you have learned during this period. This is also our practice. It was the same when we taught you one-dollar calculus last semester."
"The grades are included in the daily grades. This semester we have three small exams, including a midterm exam. The three grades together account for 75% of the usual grades, so everyone should work hard."
On the podium, a professor in his fifties looked at the students in the classroom with a smile, holding a stack of printed test papers in his hand.
This is the professor who teaches multivariate calculus to Class 1 of the Department of Physics. His name is Lin Yao. He is a professor at the School of Mathematics of Shanghai Jiao Tong University. At the same time, because he also has very in-depth research on physics, he became their mathematics teacher.
After hearing the professor's words, the students present all pretended to wail.
Of course, although they are pretending, they are not pretending in their hearts.
Forget about one-yuan calculus, it was already last semester, but this semester's multivariate calculus really made them feel the fear of being dominated.
The solution to multivariable calculus problems is basically to first simplify it into one-variable calculus, and then use the method of one-variable calculus to solve it. It can be said that the level of complexity is inherently higher.
So just the few classes they have taken this semester have already given them a feeling of ecstasy.
Not to mention the upcoming exam, which will definitely be another torture.
Of course, Lin Yao didn't care about the feelings of these students. He asked the class representatives to come up with a smile and began to distribute the test papers.
In the fourth row, sitting on a seat against the wall, Li Mu took the test paper from the classmate in front, took one sheet, and handed it to the classmate in the back row.
Regarding this exam, compared to others, it can be said that he is not anxious at all.
This is the confidence that the brain computer gave him.
Unlike the people around him who immediately looked at the questions, he took out his pen and wrote down his class name and student number first, and then looked at the questions.
First look at the question types, five multiple-choice questions, five fill-in-the-blank questions, and four major questions.
The fill-in-the-blank questions are all five points each, adding up to fifty points. There are four big questions, the first two are ten points, the last two are fifteen points, and the full score is one hundred points.
And the time is also one hundred minutes, two classes plus ten minutes between classes.
The next step is to review the question.
At this time, the brain computer started running rapidly again.
When the information about all the topics entered Li Mu's thinking, the computer in his mind began to analyze these topics at the same time.
At the same time, the knowledge of multivariate calculus that he had read twice throughout the day was flooding into his mind like a tide.
It wasn't until about half a minute later that the corners of his mouth curled up slightly.
Then I came to a conclusion: it’s all quite simple.
Even too simple.
This made him wonder, could it be because this was their first exam and Professor Lin gave them a little slack?
But he clearly remembered that the first small test of one-dollar calculus last semester stumped the whole class, right?
The thoughts in his mind did not affect his analysis of the test paper questions.
I picked up my pen and wrote option [C] in the box of the first multiple-choice question.
The answer to the first question has already been obtained from his analysis of the test paper just now.
Then comes the second question.
"Well... ∂f(x, y)/∂x and ∂f(x, y)/∂y are continuous at (x0, y0). For the function f (x, y) at the point (x0, y0), it is differentiable …”
"It's an obvious sufficient condition, choose A."
"Keep going."
With each stroke of the pen tip, one question after another is completed.
Even Li Mu doesn't need scratch paper anymore, because his mental computer is the best scratch paper.
I don’t know how long it took.
Unknowingly, Li Mu had reached the last question of the fourth big question.
And since he had already deduced this question through multi-tasking when doing the previous question, he started writing it as soon as he got it.
"Well, since ∂D is a compact set and u is continuous on ∂D, it can take a non-negative minimum value on ∂D, and then..."
"So the proposition can be established."
"OK, done."
Putting down the pen in his hand, Li Mu didn't even check.
"There can't be anyone who can't even solve this kind of question, right?"
He shook his head.
Uh... probably not?
It felt like the fifteen points for this last big question were given away for free. The question was indeed interesting, but it was not overdone.
There are quite a few talented people in his class. He studied so seriously last semester, but his final score didn't even make it into the top ten.
Thinking in his mind, he also came back from his trance.
But when he looked up at the time on the clock in the classroom, he froze.
Clam?
It's only been over forty minutes?
"Dingling bell~"
The bell rang suddenly, as if answering Li Mu——
That's right.
It's just over forty minutes.
Just one class!
Li Mu rubbed his face.
Good guy, this seems a bit... fast?
