Back to the 80s Machinery Factory

Chapter 419 You think you can tell if a formula is good or bad?!

Chen Luyang felt a chill run down his spine.

What did the teacher say...?

He doesn't understand.

Forcing a smile, Chen Luyang gave a dry laugh and offered a haphazard explanation:
"I felt this question wasn't asking about...infinitesimals, right? I thought this formula was better, so I used it..."

Teacher Zhang was amused by what he heard.

"You can even tell if a formula is good or bad? Then tell me, which formula do you think is good?"

Looking at Teacher Zhang's expression,
Chen Luyang suddenly realized something!

He's been exposed...

"Teacher, I was wrong."

Chen Luyang readily admitted her mistake: "This assignment... I didn't write it."

Teacher Zhang stared at him, then paused, "Then why didn't you write it?"

Chen Luyang's face flushed red instantly.

"I can't do it..."

Teacher Zhang originally intended to make a few sarcastic remarks to him.

But upon hearing Chen Luyang's blushing admission that she couldn't do it, the harsh words she was about to say were forced back down, and she asked:

"Then why can't you do it?"

...No, isn't this teacher going a bit too far?

Chen Luyang's face and neck turned bright red from the questions.

Why can't I do it?!

I fucking don't understand.

Take a deep breath.

Chen Luyang, having given up all hope, whispered:

"Teacher, I didn't understand the extreme squeezing method at all."

Teacher Zhang's eyes widened in surprise.

"Isn't that part of the second lesson?"

"You didn't understand anything from the second lesson onwards, so why didn't you raise your hand when I asked who didn't understand?"

The conversation between the two was far too intense.

The other teachers and students in the office all turned to look at them with curiosity, their faces showing amusement at the gossip.

Chen Luyang really wished she could disappear into a crack in the ground.

...Killing someone is just a matter of beheading them, what's going on here!

Why do you keep asking me one question after another?

Chen Luyang took a deep breath and answered resignedly:
"I want to ask, but I don't even know what to ask."

Teacher Zhang was furious!

"What's there to not know? Just ask!"

He slammed open the advanced mathematics textbook beside him. "Which part didn't you understand?!"

Chen Luyang was stunned.

what does this mean?
Are you going to give me a lecture?
After thinking it over, Chen Luyang truthfully turned to the page that had left him completely bewildered.
"I didn't understand anything from this point on."

"Sit down." Teacher Zhang pointed to the wooden stool next to him, picked up a pen and paper, and began to write down a series of formulas on the paper:
“limx→0sinxx=1 is the basic limit. When you encounter the 00-type limit, L'Hôpital can be used, but squeezing is more efficient.”

"Especially the question in your homework, which doesn't require differentiation at all."

“Look,” Teacher Zhang said without looking up, “you wrote it correctly here, but you didn’t understand the construction of the angle between the two sides of the function during the approach process. You will never learn this feeling by copying.”

……

One sentence after another,

They actually started giving Chen Luyang a lesson!
Chen Luyang sat on the stool, bewildered, listening to Teacher Zhang's lecture with an almost flattered expression.

...No, didn't he come to ask for leave?
Shouldn't they be given a severe dressing-down and made a fool of themselves?

Why is he giving himself extra help?!
"I've been lecturing you like this, and you're still daydreaming?!"

Upon noticing that Chen Luyang had wandered off, Teacher Zhang's tone changed.

Chen Luyang was startled and quickly sat up straight: "No, no! I just don't understand this part very well."

Which one?

“This…” Chen Luyang quickly pointed to an intermediate step on the paper, “I got stuck when I heard this last time, and then I was completely dumbfounded.”

"Isn't this just about substitution and differentiation? Look over here."

Teacher Zhang picked up her pen again, "The breakdown of this logic chain is as follows: first, replace the variable with f(x), then expand using the definition, and then..."

As Chen Luyang watched the teacher break down, explain, and organize the steps of the derivation, he suddenly felt as if someone had opened his skull and shoved a hot rod into it.

The chain of knowledge that was originally tangled up like a ball of yarn is now slowly starting to straighten out!
He couldn't help but ask, "What if it's an inverse function? Do we still need this formula?"

Upon hearing this, Teacher Zhang immediately added, "For an inverse function, we need to check if it's monotonic. If it's a strictly monotonic function, then we can directly determine the existence of the limit from the mapping of the original function..."

Seeing that the other party was really giving him a lecture, Chen Luyang didn't hold back.

He would ask questions whenever he encountered something he didn't know.

To his surprise, Teacher Zhang really did explain it to him very seriously.

As they talked, the two ended up discussing the entire lesson's content.

Until the bell rang for the start of a new class in the corridor,
Teacher Zhang then put down his pen.

"Is there anything you still don't understand?"

Chen Luyang paused for a few seconds, mentally reviewing the logic he had just explained, and then said seriously:
"No, this time I really understand everything."

"You really understand everything?"

"real."

"Okay, I'll give you some homework to do when you get back."

As Teacher Zhang spoke, he quickly wrote down a question on a piece of paper.

"Two requests."

He looked up at Chen Luyang and said, word by word:
"First, you must do it yourself."

Second, no more skipping class!

Teacher Zhang looked at Chen Luyang seriously: "You can ask me if you encounter anything you don't understand, but you can't skip class."

“I know you students too well. If you don’t understand, you won’t want to come. The less you come, the less you understand.”

"But who doesn't start from scratch?"

"The more you try to avoid it, the less you'll know!"

These words weren't harsh, but they struck a chord deep within Chen Luyang's heart.

A deep sense of guilt welled up in Chen Luyang's heart.

He skipped a class and went to the mechanics department, only to be met with a cold shoulder.

As a result, the advanced mathematics teacher whom I dreaded the most and wanted to avoid the most used my time to give me a whole lesson of extra material.

"Thank you, teacher. I will definitely study hard!"

Chen Luyang thanked him sincerely.

"Alright, go back and think about it carefully. Come find me again if you don't understand anything."

Teacher Zhang looked at him with disdain:
"You studied economics, how can you manage if you're bad at math?!"

"Turn this assignment to me during class on Friday."

"Good teacher!"

……

back to dorm
Chen Luyang could hear a burst of laughter coming from room 421 from a distance.

What's going on? It's so lively!

As soon as Chen Luyang entered the room, he saw the five brothers from 421, along with Sun Legen, Zheng Zhe, Feng Tiesheng, Han Zhihui, and Cui Shaojie, crammed into the small dormitory room, chatting enthusiastically!
Before I could even ask,
A group of people swarmed over like they were on steroids.

Zheng Zhe asked cheekily, "Wenwei, why did you take so long? Did you poop in Teacher Zhang's office?"

"roll!!!"

Chen Luyang roared angrily.

He finally saw through it. Every single one of those bastards was here in the dorm waiting to see him make a fool of himself.

These bastards!
"Brother Chen, tell me quickly, how did Teacher Zhang scold you?" Cui Shaojie, cracking sunflower seeds, leaned over with a gossipy look on his face.

"Screw you!"

Chen Luyang raised her hand impatiently and pointed at each of them one by one:
"You bunch of bastards, you never wish me anything good."

"Teacher Zhang didn't scold me at all."

"Then what did you do?" Sun Legen asked, puzzled.

"...tutoring."

"what???"

The room fell silent for a second, as if someone had pressed pause.

The next second, everyone was in an uproar.

"Teacher Zhang is giving you tutoring?!"

Cui Shaojie's voice almost cracked: "Teacher Zhang was so angry this morning, and she called you over for so long just to give you extra lessons?!"

Han Zhihui was also puzzled: "Yeah! When Teacher Zhang heard that you asked for leave, she scolded our class monitor and was so angry that she almost cursed him."

"Cultural Committee Member... are you just being stubborn and deliberately coming back to lie to us?"

Chen Luyang looked at the room full of bastards with disdain, pulled out her notebook and tossed it to them, her tone laced with arrogance:
Why would I lie to you?!

"This is the lesson that Teacher Zhang just taught me, and she even gave me homework!"

As everyone crowded around to look at his notebook,

Chen Luyang was showing off with great satisfaction.
next moment,
A piercing and heart-wrenching voice rang out:
"...That's not right, the Cultural Committee."

"Didn't we already talk about 'the continuity and classification of discontinuities of functions' in class today? Why is your homework still a problem about the limit squeeze method?"

Looking at the homework assigned by the teacher, Zheng Zhe uttered a question from the depths of his soul.

Grass!
In an instant, Chen Luyang's murderous intent reached its peak.

"Right, wasn't the extreme squeezing method what we talked about in the second lesson?" Zhao Lixin asked with a suspicious expression.

"Wenwei, so you're saying you started not understanding things from the second lesson onwards?"

"So, Teacher Zhang explained it to you from the beginning???"

Seeing Feng Tiesheng's sympathetic expression, Chen Luyang finally couldn't hold back anymore.

"Is there anything else?"

"Get out of here, all of you!"

In the small dormitory,

Having breached the defenses, Chen Luyang was shooing people away like a mother hen chasing away chicks.
However, they were outnumbered and outgunned.

Before they could even chase a few people away, Zheng Zhe, as if out of the blue, blurted out:
"Wenwei, do you know how to do this question? I can write down the answer for you."

"roll!"

……

These bastards.

After finally getting everyone out, the room finally quieted down.

Chen Luyang sat back in her chair, just about to catch her breath, when Tao Runze suddenly spoke up:

"Xiao Chen, why are you attending a mechanics class?"

The others also looked over curiously.

I'm so curious!
How could someone who couldn't even understand advanced mathematics go and attend a mechanics class?

Can you understand me?!
"Don't mention it."

Chen Luyang sighed and told them about Zhang Diancai's situation with a sense of frustration.

When he heard that Zhang Diancai hadn't spared Chen Luyang even a minute more,
The expressions of the several people varied, but they all frowned slightly.

"Actually, that's understandable."

Zhang Dongliang said, "You said that teacher works on military projects, and he's busy supervising graduate students and running around research institutes, he's so busy he barely has time to breathe."

“You’re a student, and the manager of a small repair shop, asking someone to draw a diagram… It’s normal that you wouldn’t agree.”

"I know." Chen Luyang pulled over a small stool and plopped down.

If it were the deputy director of the provincial machinery factory who went to see Zhang Diancai, even if he was very busy, he wouldn't be denied a chance to speak.

"I'm thinking about how to get him to draw blueprints for me," Chen Luyang said, deep in thought.

Asking for help is definitely out of the question.

This kind of thing can't be forced; it's about equal cooperation.

Besides, he represented a repair shop.

He can be shameless, but the repair shop can't!

"Have you thought of a solution?" Jiang Feng asked.

"No..." Chen Luyang honestly admitted, sighing.
"Let me think about it first!"

Saying,

Chen Luyang took out the homework that Teacher Zhang had given him, picked up a pen and paper, and began to work out the calculations seriously.

……

Recently, Chen Luyang has been spinning like a wind-up top, constantly turning around.

Aside from being seen in the dormitory at night, they basically disappear the rest of the time.

During the day, I either attend economics classes, write this week's translation manuscript, or shuttle between philosophy classrooms and the mechanics science building.

In short, it's a lot of back and forth!

Especially in the mechanics department, he would occasionally have to sit in on classes to figure out which professors were a good fit and could help them draw blueprints.

Unfortunately, reality is just that harsh.
Someone who's cheerful and easy to talk to can't actually help you.

He's too busy to help you, even if he could.

Chen Luyang was not discouraged and would often find opportunities to visit the mechanics department's office.

Although these things take a lot of time and effort, at least you can figure out a way to do them.

But the path of advanced mathematics is truly too difficult.

Chen Luyang had originally decided to give up on advanced mathematics.

Anyway, I usually just copy Zheng Zhe's homework.
When the exam comes, I'll whisper to Teacher Zhang and ask him to draw some questions for me. Just passing will be a victory!
But ever since Teacher Zhang gave her a tutoring session last time, Chen Luyang was overwhelmed with guilt.

Teachers are so persistent and never give up on their students.

If I don't study hard, I'll be a terrible person!

In this way,
The course he most wanted to give up on, Advanced Mathematics, actually became the course that Chen Luyang studied the hardest.

Although he still couldn't understand the teacher's lectures, he stubbornly persisted in listening attentively and painstakingly, bit by bit.

If you're really stuck on your homework, just ask Zheng Zhe.

Although his advanced mathematics was still very poor, he managed to keep up, albeit stumbling along the way.

That day, Chen Luyang had just finished asking a question when Zheng Zhe patted him on the shoulder enthusiastically:

"Hey, let's go play some ball!"

"No, I have class in a bit."

Chen Luyang yawned wearily and put her pen and notebook back into her schoolbag.

"...You still have classes?!" Zheng Zhe asked in surprise.

"I feel like you're busier than the principal every day!"

Chen Luyang sighed, "Don't even mention the principal, I feel like even my future father-in-law isn't as busy as me... I'm leaving!"

Pack your things.

Chen Luyang rushed to the Science Building with her bag on her back.

After listening to the materials science lecture, Chen Luyang shamelessly followed Li Xiping and asked him a few more questions, chatting and trying to get closer to him all the way to the mechanics department office.

As soon as I reached the end of the corridor, I saw that the door to office 212 was half-open, and I could vaguely hear the voices of several people talking inside.

Still can't find the spark plug cross-section diagram?

An anxious voice came from behind, sounding somewhat like Zhang Diancai.

“The students’ drawings are too idealistic. They’re all drawn according to the textbook, based on assumptions. They’ve never seen the real thing, and they don’t have any samples to compare with,” another younger voice chimed in.

(End of this chapter)