I just want to be a quiet and powerful person

"Lagrange's mean value theorem, as the name suggests, is proved by Lagrange. Lin

Xian paused, wrote Lagrange's name on the blackboard, and said with a smile:"In the world of mathematics, theorems and conjectures are generally named after the proposers and provers." In the future, if you see the name of a strange mathematician and want to know whether he is awesome or not, it is very simple. You just need to recall whether there are any mathematical conjectures or theorems named after him."

"Although not all great mathematicians have proven or proposed conjectures and theorems. But mathematicians whose conjectures and theorems are named after them must be awesome!"

Hearing this, the students in the classroom smiled knowingly.

They thought this substitute teacher was not bad, his words were interesting, and he was not boring at all.

"Before explaining the theorem, let us first get to know the mathematician. Lagrange was a French mathematician who studied under Euler, the first person in mathematics at that time. In the words of current online novels, he is a candidate for the Son of God or the Son of Tao."

Hearing this, the students couldn't help but smile again.

Lin Xian held the chalk, slightly rolled up the cuffs of his windbreaker, and with a confident smile on his face, he talked:"He is good at equation theory, analytic function theory, number theory, etc. He has made important contributions in this regard, and Lagrange's mean value theorem is one of his many achievements. Okay, after introducing the prover of the theorem, let’s take a look at the conditions and conclusions of this theorem.……"

At this moment, Yan Xiaoman looked like he had seen a ghost.

Her boyfriend, who is a bad student, is now giving her a lecture, and he teaches her the key points very well.

This shit...who would believe it if I tell it!

Hallucination!

It's all an illusion!

I must have opened it the wrong way!

Thinking of this, Yan Xiaoman closed his eyes, took a deep breath, and then opened his eyes again.

What caught his eye was Lin Xian on the podium.

At this moment, Lin Xian was staring at her and said with a half-smile:"Classmate Yan Xiaoman, please answer the relationship between Lagrange's mean value theorem and Taylor's formula."

Yan Xiaoman:? ? ?

She had been in a state of confusion just now, her mind was filled with questions, and she didn't really listen to what Lin Xian had to say.

Seeing her dumbfounded and speechless, Lin Xian smiled evilly and said,"Listen carefully in class and don't be distracted. I don't want you to become the worst student in the worst class I have ever taught... the worst one!

" The worst one among all the students in the graduating class?

Many students couldn't hold it back and laughed out loud. hiss!

Yan Xiaoman was so angry that she kept grinding her little tiger teeth, and a dangerous light flashed in her beautiful eyes.

If the situation wasn't right now, she would definitely bite this bastard to death.

This bastard actually embarrassed himself in front of so many classmates.

Hey, I’m so angry!

But apart from being angry, Yan Xiaoman was even more shocked.

Is this man on the podium who is talking calmly and calmly, really his scumbag boyfriend?

If this guy is a scumbag, then who do you think he is?

Xuemo?

Or a disabled student?

……

For Lin Xian, Lagrange's mean value theorem, the basic theorem of first-order calculus, is as simple as addition, subtraction, multiplication and division in elementary school.

Moreover, he is the same age as these students, so his way of speaking is not as rigid as some teachers. Instead, he often has witty remarks and one or two Internet buzzwords often pop up.

The lecture content was also simple and easy to understand, so these students listened with interest.

Time passed unknowingly, and in the middle of the course, a slightly obese middle-aged man hurried into the classroom.

When he saw Lin Xian talking eloquently on the podium, he couldn't help but be stunned.

The two stared at each other and fell into silence.

Wang Zhouji was a little annoyed. Before class, something suddenly happened at home.

Generally speaking, you need to say hello in advance when you hire someone to teach temporarily, but how can you find someone like him just a few minutes before class starts?

But things at home were urgent, so Wang Zhouji had no choice but to go home and deal with them first.

Fortunately, the matter was settled quickly, but when he hurried to the classroom, he suddenly found a young man giving a lecture on the podium.

Honestly, for him, that's a good thing.

Because without asking for leave, the teacher skipping class is a big deal.

To put it mildly, I would only be late for a while, and at most let the students study on their own for a while.

But speaking more broadly, if someone is reporting it, it will be a teaching accident, which is serious.

Now someone is teaching for him, which is a good thing in theory, but the problem... he didn't ask anyone to teach for him!

Or is it that the school has arranged a teaching assistant for itself?

But I didn’t receive the notification either!

After being stunned for a few seconds, Lin Xian was the first to react and quickly said with a smile:"Professor Wang, have you settled the matter?"

"Uh...it's taken care of!"

Professor Wang smiled politely and nodded, but he was still confused in his heart. Do we... know each other?

Lin Xian put down the chalk and suggested:"Continue to take care of your affairs, then you can give a lecture! Wang

Zhouji glanced at the blackboard, then glanced around the circle of students sitting at attention, waving his hands and saying:"No, no, you continue to lecture, I will listen for a while.""

As he said that, he found an empty seat and sat down.

The other students didn't find it strange, but Yan Xiaoman and Zhou Hui looked strange.

Even though there was an extra professor in the classroom, Lin Xian didn't have stage fright. What should I say? Just talk about it.

Wang Zhouji was a little uneasy at first, but as he listened, he couldn't help but raised his eyebrows.

Oh, this guy's teaching skills are good!

Although he is still a little jerky, his math level is okay, and he understands the knowledge points very well. Thorough.

This made him feel relieved.

During one class, Lin Xian finished explaining Lagrange's mean value theorem. He glanced at the time on his watch and found that there were still two days until the end of class. Minutes later, he couldn't help but said with a bad smile:"Now let me give you an assignment. The content is to think about whether the conditions of Lagrange's Sino-Japanese mean value theorem are necessary? If not, please give an example."

Assigning homework was just a temporary evil idea on his part.

But he didn't expect that the feeling of assigning homework to students would be so... refreshing!

Now he finally understands why some teachers like to assign homework to students so much. Because of this kind of thing, It's addictive!

It's so cool!

He was happy, but the students were sore.

And there were homeworks?

In the past, Professor Wang Zhouji never assigned homework in class, because mathematics did not have a great impact on their majors. Zhou

Hui grimaced and lowered her voice:"Xiaoman, why do I feel that your boyfriend did this on purpose?"

"Be confident and remove the feeling, this bastard did it on purpose!"Yan Xiaoman rubbed his little tiger teeth and said coldly.