When he woke up from this sleep, Chen Zhou actually felt like a world away.

"I slept so comfortably..."

Chen Zhou stretched on the bed, then reached out and touched the head of the bed.

I touched my phone and picked it up to look at it.

"Damn, it's over..."

The phone shows the time at 10:45.

Chen Zhou hurriedly jumped out of bed and quickly put clothes on his body.

But he was wailing in his heart, he slept well, but Lao Wang's side was estimated to be blown up.

"Hey, Chen Zhou, are you awake?"

Hearing this voice, Chen Zhou subconsciously shrank back.

Looking at the door again, this old-fashioned man who he least wanted to see was standing at the door.

And then, with a bowl in your hand, noodles?!

"The king... Mr. Wang, you... Why are you here? Please take a seat..."

Chen Zhou said, pulled his clothes well, pulled the bench out, and invited Wang Xuehui into the room.

"Are you alright? I see you didn't go to class in the morning, and you didn't ask for leave. Wang Xuehui put the noodles in his hand on the table, approached Chen Zhou, and asked with concern.

"I... I'm sorry, teacher, I overslept, I didn't know how to do it yesterday..."

This is the first time in Chen Zhou's more than ten years of school history that he has overslept, and he has never had it before, so that Chen Zhou even stammered a little when he explained.

It's just that what Chen Zhou didn't expect was that Wang Xuehui interrupted him with a smile: "Did you study too late last night?

Chen Zhou was stunned for a moment, and said slowly: "Teacher, how do you know?"

"You don't have to ask me how I know, you can't do this in the future, you know? Although we emphasize hard work, but people are not iron-clad, you don't sleep all night, plus such a high-intensity study during the day, and you didn't sleep at noon yesterday, how can you bear it!" Wang Xuehui looked at Chen Zhou and said, "Go wash your face and eat this bowl of noodles." Forget it today, you can go back and make up a review for me. If you're late in the future, I'll ask you to review it in front of the whole class. ”

Chen Zhou looked at Wang Xuehui, a little unsure, is this old Wang serious?

Is there really such a thing as good or bad academic performance?

Wang Xuehui saw that Chen Zhou didn't move, and urged: "Go quickly, when the face is cold, it will stick to a piece." ”

"Hey, okay, thank you, teacher. Chen Zhou came back to his senses, nodded yes, walked out of the house quickly, brushed his teeth and washed his face.

Wang Xuehui sat at Chen Zhou's desk, looking at the scattered review materials on the table, and couldn't help frowning.

Looking at the room again, there was hardly any empty space, and it was full of scratch paper and old materials.

"It's hard to study, but can't this room and this table be cleaned up?" Wang Xuehui couldn't stand it anymore, and started to help Chen Zhou sort out the materials on the table.

When Chen Zhou returned to the house, he saw that Wang Xuehui had already put the review materials on the table, a small pile of sub-subjects, neatly and neatly.

And Wang Xuehui was intently holding a piece of scratch paper and watching.

Chen Zhou thought about it, approached silently, and glanced at Wang Xuehui's gaze.

On this scratch paper are the notes he took to study the Lagrangian median value theorem and some application examples.

Good thing it's not some messy notes...

One more look at the backpack, intact and unopened. That... The small rolls and handouts that were not done should also be safe.

"Ahem..."Chen Zhou coughed lightly twice before he asked knowingly, "Teacher, what are you looking at?"

When Wang Xuehui saw that Chen Zhou was back, he pushed the bowl of noodles and said, "You eat the noodles first." ”

Chen Zhou obediently picked up the bowl and ate it.

Wang Xuehui focused his eyes on the scratch paper again, and after reading it all, he said, "Chen Zhou, when did you learn this?"

Chen Zhou thought for a while and replied, "I learned it recently." ”

Wang Xuehui asked again: "Are they all self-taught?"

"Hmm. Chen Zhou nodded.

Wang Xuehui said curiously: "You can't usually get into this knowledge, how did you think of learning this?"

"Uh... Just to make it easier to solve the problem, I searched on Baisou, and then this theorem appeared. Curious, I clicked in and took a look, and I thought it was quite interesting, so I learned it. Chen Zhou reluctantly explained this reason for his studiousness.

"How does it feel to learn?"

"It's good, it's useful when solving some functional problems. ”

Talking about this, Wang Xuehui nodded very happily, such a studious student, in addition to studying, what else can make him late?

Objectively speaking, Wang Xuehui is right.

After a pause, Wang Xuehui thought of something, so he said to Chen Zhou: "What if, the teacher tells you that this theorem cannot be directly used in the college entrance examination?"

"Won't it?Why can't you use it directly?What if you use it?" Chen Zhou's face was full of doubts and confusion, such a well-used theorem, a theorem that I learned by cultivating immortals and exploding my liver, you told me that you can't use it directly?

Wang Xuehui explained: "Because this is the knowledge of advanced mathematics, it does not belong to the category of high school mathematics. High school mathematics cultivates basic mathematical literacy, which pays attention to mathematical thinking and the specification of each problem-solving step. ”

"Like the Lagrangian median value theorem, not to mention how many students know it, even if everyone knows it, they all remember it. What can be remembered is only the theorem itself, and the ins and outs of this theorem are almost unknown. In this case, it is just opportunistic to use it directly when solving the problem. Moreover, once you make a mistake, you are more likely to get 1 point at all. ”

"But, then again, I really understand the ins and outs of this theorem, and I know the proof method, so I don't care if I use it directly, right?"

After Wang Xuehui's words were finished, Chen Zhou didn't react for a long time, so that the noodles he picked up were hanging in the air.

It's a matter of all perspectives.

When Chen Zhou learned the Lagrangian median value theorem, he thought of how to use it directly and how to solve the problem more simply.

but ignores the fact of taking the college entrance examination.

The college entrance examination can be said to be an examination of 12 years of basic education, if the knowledge of advanced mathematics is used beyond the curriculum, it may make it easier to solve the problem, but as Wang Xuehui said, in case of writing mistakes, what do you use to score?

The reason is also very simple.

The questions that are solved step by step with the basic knowledge can show the results of your study over the years.

But with super-class knowledge and direct substitution of theorems, then nothing can be seen.

Not to mention, even substitution is wrong.

Chen Zhou thought about it from Wang Xuehui's point of view, and he understood.

But when he thought that this was the hidden task of the system, he would never be allowed to learn a theorem that could not be used, Chen Zhou only felt tired.

If you contact Wang Xuehui again, it turns out that cultivating immortals is just the beginning, and the big fish of the Lagrangian median theorem has just surfaced a little.

Chen Zhou sighed silently in his heart, finished pulling the noodles, and said to Wang Xuehui: "Teacher Wang, I understand." Thank you, I will use this theorem with caution. Also, will you take this bowl with you?"

"Bowl, why should I take it away, give it to your landlord. ”

"Landlord?"

"He's my brother. ”

“？？？”