Some people say that mathematics belongs to boys' subjects because boys are good at logical thinking.

For this kind of statement, Zhou Yunshan has always scoffed at it before.

But now, she has to wonder if girls are really a little worse than boys in mathematics.

For example, she herself really has no way to solve the high math problem in front of her.

This is a problem of finding the partial derivative, let x=e∧u+usinv, y=e∧u-ucosv, find the partial derivative of u to x and the partial derivative of v to y.

After racking her brains for more than half an hour, she has the idea of solving the problem, but no matter how she asks for guidance, the results she gets are not the right answer!

Could it be that there is a problem with the answer?

After all, books are also written by people, and it's not surprising that there are occasionally one or two mistakes.

If it was Liu Feng, he would definitely think that it was the answer to the question, but Zhou Yunshan could answer with certainty, the answer to this question is no problem, because she calculated several times, and each time she got a different solution!

Uh, that's embarrassing!

Rubbing the tip of her nose, Zhou Yunshan did not believe in evil and calculated again.

However, after a few minutes, she finally gave up, because the solution calculated again still did not match the answer, and not only did it not match the answer, but also the answer of the previous times!

"Ahhh

Why do you have to take a course like high mathematics when you are going to graduate school, it's really unfair to girls!

"Whew~" took a deep breath, rational as she must be calm, calm.

"Why don't I find someone to ask?" Finally, Zhou Yunshan, who had calmed down, looked sideways at Liu Feng on the side, and the heavens and men were at war in her heart, "But what should I say? After all, I didn't thank him for asking him a question last time?"

Hello, can you do me a favor?

I don't know how to do this question, can you help me take a look?

Boy, write me out the steps to solve this problem!

Handsome guy~, can you help me look at this question?

Oh, wouldn't that be embarrassing? What should I do?"

Zhou Yunshan imagined the scene of how to ask Liu Feng questions in her heart, but unfortunately she was really clumsy in words.

"Whew~" Zhou Yunshan took a deep breath, no matter what, just die......

Liu Feng naturally didn't know the battle between heaven and man in the young lady's heart, at this time he was concentrating on looking at the brief history of modern physics, and he was not used to the usual pleasant sound of turning books, but he was still a little unaccustomed.

Suddenly felt that his arm was poked by something a few times, Liu Feng looked sideways, and it turned out to be the young lady next door.

"I can't do this question, you can help me take a look. Zhou Yunshan wanted to ask Liu Feng for advice in a soft voice, but as soon as the words came out, her tone turned out to be a little unreasonable inexplicably, and she had a cold face.

"Uh~" Liu Feng only felt a chill coming to his face, and he was stunned, how could he ask others questions like this? .

"What, you don't want to?" Zhou Yunshan saw that Liu Feng was indifferent, and her face became more and more cold, "Hmph, then forget it!"

"Eh~" Liu Feng is really inexplicable, what's wrong with the young lady, where did I provoke her, could it be that the eldest aunt is here again?

The secret path is only difficult for women and villains to raise, but the movements in her hands are not slow, Liu Feng snatched the exercises and scratch paper in her hand.

"Is this the question?" After just glancing at the question, Liu Feng already had the answer in his mind, his eyes glanced at the young lady's dark and long hair, and his tone was slightly disdainful, "It's a very simple question!"

Zhou Yunshan's face became even colder, and her white was a little ruddy.

Liu Feng didn't seem to realize it: "First of all, you find a partial derivative of x, get 1=e^u*əu/əx+əu/əx*sinv+ucosv*əv/əx, and then ...... At last...... Isn't that the solution?"

Throwing the pen on the scratch paper, "It's easy!"

There was a moment of silence.

Turning his head and seeing Zhou Yunshan's flushed face, Liu Feng suddenly felt that he was too high-profile and hit people's self-esteem?

Hurriedly lowered his tone and comforted: "But I can't blame you, after all, this semester has just begun, this is what you need to learn later, you have learned here now, and you are already very smart......"

"Very ~ Cong ~ Ming ~ ......" Zhou Yunshan's ears kept echoing this sentence, looking at Liu Feng with an expression that I am very optimistic about you, she originally wanted to say a word of thanks to Liu Feng, but she just came to her mouth and held it back, her face was flushed.

I turned my head and saw a brief history of physics in Liu Feng's hand: "You are also interested in physics?"

"Of course, haven't I finished all the courses in the next semester, and I'm idle, maybe I can ......minor in the future," Liu Feng raised his head proudly, "When you finish this semester's courses, you can also minor in physics, after all, chemistry and physics are close relatives, and you can still get some edges, and if you take one more course, you may be able to get a double degree or something in the future." ”

Zhou Yunshan smiled and smiled brightly: "Senior brother, I have professional physics textbooks from freshman to junior year here, and I will be admitted to graduate school next semester, so I can lend it to you to take a look." ”

Liu Feng: "......"

…………

On the other side, the teaching building of Huada University.

On the TT of the mobile phone, Shi Shang was communicating with Liu Feng.

"Fengzi, it's safe, this class exterminator is too unnamed!"

"Didn't name it?hehe, then tomorrow's breakfast (two smiling faces) ......"

"Roll ......"

Exterminator Shitai, named Yan Shan, is a lecturer in high mathematics and a middle-aged woman in her 40s.

In fact, in terms of appearance and temperament, Yan Shan has nothing to do with the nickname of Exterminator Shitai at any point.

Although she is more strict in class, she is completely able to play with the students after class, talking and laughing, and she is really approachable.

The key is that she is in her 40s, and she still looks like a young woman in her 20s, so she was still very popular with her classmates in the last semester.

However, at the end of the term, there are too many children's shoes hanging high!

Other teachers have given key points or something, but she is a good old man, and she really kept her mouth shut, and she didn't leak a word at all, plus I heard that the final exam paper was produced by her old man himself......

The children's shoes in her class are so miserable!

Therefore, I don't know which good thing person gave someone the nickname of Exterminator, which is really ......

"The difficulty of double integration is ...... As long as...... Then a topic like this, it's simpler!"

In class, Yan Shan carefully explained the difficulties of this class again, "Have the students memorized them?"

"Remember!"

"Remember!"

……

The students in the hall replied neatly.

Nodding, Yan Shan was still quite satisfied, in her class, the students' enthusiasm for learning was still quite high, at least, there was no sleeping student: "Then, since I have memorized everything, I will randomly select two or three classmates to come up and do a few questions......"

"...... Uproar"

"It's miserable, don't draw me!"

In the classroom, the students instantly released a wail.

Especially those who help point out, if you draw a student who didn't come, do I go up or go up, after all, I can't write a punctuation mark when I go up, but I lose the faces of two people!

"Ahem!"

Hearing that the exterminator was seriously preparing to take the roll call, Zhou Shishang was quietly staring at Sun Xiaoxiao's back not far away, and immediately covered his face: Don't draw me, don't draw me!

"Zhou Shishang!"

"Boom"

A group of people neatly turned their heads to look at the lucky hero, but their eyes were full of schadenfreude.

Zhou Shishang: "......"

I'm really afraid of something!

It's the top champion who is also TM!

In the past two days, has he offended any Mao God, he has diarrhea all night and doesn't say anything, and this name has been pointed out to himself!

Zhou Shishang cried with a sad face, facing Sun Xiaoxiao's curious gaze, and there are beautiful women in his heart, we can't be cowardly, we can't coax, especially in front of Sun Xiaoxiao, we can't coax it!

Finally squeezed out an ugly smile, this thing held his head high, reluctantly moved his position, and said in his heart What is the schadenfreude, aren't there any unlucky people among you who have not been selected?

But it seems that there is a kind of wind and water cold, and the strong man is gone?

"Liu Feng!" ......

What?

Shi Shang, who had just taken two steps, was completely stunned at this moment, is it possessed by your old man's golden finger?

It's miserable!