Xueba: The knowledge I teach, critical hits are returned

Chapter 17

Linhai University, Classroom 201, Building 4, Teaching Building.

On the podium, an old professor wearing black-framed glasses emphasized the exam discipline:

"Dear students, although this is not the end of the semester, I still want to emphasize the exam room discipline. 1. No whispering, especially during the exam; 2. No plagiarism, no plagiarism, no plagiarism; 3. No going to the toilet during the exam without special reasons......"

After drinking the wolfberry tea in the thermos, the old professor continued,"I know that some students have prepared small notes, hoping to have a chance to take a look. I advise these students to give up this idea."

Hearing the old professor's words, Li Xiongfei, who was sitting in front of Gu Bai, immediately clamped his legs together.

Some other students who had prepared small notes also had their hearts pounding faster.

"Your sister..."Why is it so strict!"

Some students complained quietly.

Obviously, the professor in charge of the exam put enough pressure on them this time.

Gu Bai smiled indifferently.

His grades were good to begin with, and now with the support of System Mathematics LV4, he just took this exam for fun.

He stretched his body and waited for the students in front of him to pass the test paper.

""It's too difficult. There must be something fishy about this exam." Li Xiongfei in the front row handed the test paper to Gu Bai and complained in a low voice.

After receiving the test paper handed over by Li Xiongfei, Gu Bai wrote down his student number, full name, and major class, and glanced at the questions casually, a little puzzled. Is the test paper difficult?

I can't tell.

After that, Gu Bai picked up a black signature pen and began to write quickly.

You can only know whether it is difficult or not after writing it.

The first type of questions on the test paper are multiple-choice questions. The first question is a typical function f(x)lim to find the limit, which is substituted into x tends to infinity and x tends to The result is obviously B.

The second question tests the squeeze criterion, so you don't even need to calculate it.

The third question is about finding the spatial coordinates of the spatial coordinate system. After thinking about it in your mind, Gu Bai checked C.

As for the fourth question, it is a simple function calculation, which is a free point question. Using a draft paper is disrespectful to these two questions.

The last question of the multiple-choice question is a bit confusing. Let ∑ be 0=z=1 on the surface x2+y2=R2(R0), and find the value of ?e√x2+y2sin(x2+y2)ds. em.......

Gu Bai's brain worked for a while and he had the answer in his mind.

This question looked scary, but it was actually a test of the students' combination of spatial surfaces and equations. As long as they mastered some methods of solving equations for spatial curves, the final result would be nothing more than calculation.

To calculate equations of this level, wouldn't it be enough to have hands?

"I guess Li Xiongfei must have read it wrong. The test paper wasn't that difficult."

"Or maybe the hard part is all in the back."

Gu Bai didn't dare to be careless. After finishing the multiple-choice questions, he began to prepare to crack the questions in the back.

However....

The difficulty of the following test paper...Gu Bai was stunned. He finished the last question without any problems.

"Is this the difficulty?"

Gu Bai thought doubtfully. After filling in the last question, he looked around. He was really afraid that he had taken the wrong test paper.

"Don't whisper to each other."

But at this moment, the professor on the podium coughed and reminded Gu Bai, which scared him.

He didn't plan to cheat, he just suspected that the test paper was taken by the wrong person.

After waiting for a while, Gu Bai thought about it and simply ignored it. It was not his responsibility to hand out the wrong test paper.

Fortunately, Gu Bai walked towards the podium with the test paper and handed it in.

"Don't think about it anymore, just give up now."Seeing Gu Bai hand in the paper, the old professor sitting next to him adjusted his black-framed glasses and asked with some dissatisfaction

"Don't think about it."Gu Bai paused, and wanted to ask the professor if he had taken the wrong simple test paper, but seeing his attitude, he gave up.

As for checking, it is not necessary.

If this question still needs to be checked, then...Gu Bai might as well just hit his head and die.

"Well, go ahead."Hearing Gu Bai's answer, the old professor shook his head in disappointment.

""Oh." After placing the test paper neatly on the table, Gu Bai picked up his schoolbag and left.

Before the exam, Gu Bai received a message from Senior Wu Hai, saying that he would come back to school today to look at his graduation thesis.

Gu Bai took this opportunity to find Senior Wu Hai and collect the 800 yuan hard work fee.

"Why~~"Watching Gu Bai leave, the old professor sighed and reminded the students who were still taking the exam:"This time the test paper is from the mathematics department, so it is indeed a little more difficult, but...Students can't just give up like this."

"There are still 100 minutes left before the exam. It would be a shame to give up like this, right?"

The last question was deliberately asked for the students who were still writing the test papers.

Slowly standing up, the old professor put the thermos cup in his hand on the podium.

Suddenly, the lonely test paper on the podium, which was full of answers, made him stunned.

He had finished writing it?

It was only more than 20 minutes before the exam.

Puzzled, the old professor picked up Gu Bai's test paper and began to read it.

"BDCDA, it's rare that I didn't write it randomly, I got all the multiple-choice questions right."

The old professor was a little surprised, because he was the one who wrote this test, so he knew the answers very well.

He didn't stop and continued to look at the fill-in-the-blank questions.

The first question (-2π，√2) Yes. You got the second question right....

As the old professor looked down, the expression on his face changed from suspicion at the beginning to surprise, and finally to a hint of shock.

He didn't expect that this test paper was a perfect score.

If it was just a perfect score, he wouldn't be so surprised. The most important thing is that this test paper was the one that the student finished in 20 minutes.

A perfect score in 20 minutes

?...I'm afraid some graduate students in mathematics can't do it.

"Interesting, really interesting"

"A non-mathematics student can have such a talent."

The old professor smiled unconsciously. He hadn't seen such a genius in many years.

As for Gu Bai cheating, he could completely rule out this possibility.

First, he was the invigilator, and second, he had printed the test paper himself this morning.

After reading the test questions, the old professor looked at the name column.

Name: Gu Bai

Student ID: **

Major: Nonwoven Materials and Engineering

"Gu Bai, a nice name."