Chapter 580：

For a while, everyone in the classroom was full of black question marks

Nima, we clearly saw you sitting in the student seat, how could you instantly become a substitute teacher?

Is this insulting our IQ?

Suddenly, there was a burst of whispers in the classroom.

"Fuck, who is this buddy?"

"Huh! Handsome little brother, talk about a professional one? Why haven't you seen it before?"

"I think he might really be a substitute teacher!"

"Why do you say that?"

The reason is very simple. I have seen a few handsome boys in our big class. But this handsome guy is very face-to-face, seeing him for the first time. "

"I'll go, this skin is too good!"

...

"Quiet!"

Lin Xian sternly knocked on the podium several times.

Seeing his serious face, the students closed their mouths involuntarily, and the classroom was quiet again.

Seeing this scene, Lin Xian nodded in satisfaction, and said: "Professor Wang talked about Lagrange's median theorem in the last lesson. Let's continue today."

Not to mention, although Lin Xian was young, but with outstanding temperament, coupled with his tone and demeanor, he couldn't help being convinced.

Ever since, these students opened the books one after another.

If you replace them with the old fried dough sticks, you can't deceive them.

However, this group of students are just freshmen in the freshman year, and they are still very simple. They have not changed their way of thinking from the high school period, so they are more cheating.

As for the substitute teacher, why did they sit in the student seat before? These students felt that they were probably observing their discipline

Well, the brain supplement is very good.

Looking at the classmates who were sitting right next to them and carefully listening to the class, Yan Xiaoman and Zhou Hui were completely dumbfounded. Is this okay?

But soon, Yan Xiaoman recovered, with a playful smile in his eyes.

What good is it for you even if you pretend to resemble it again?

Could it be that you still...

Damn it, it really does!

In the next second, Yan Xiaoman's eyes widened, and he fell into a circle of confusion again.

On the stage, Lin Xian picked up a piece of chalk, quickly wrote a line of formula on the blackboard, and then talked freely.

The key is that he lectures completely without writing, even without a textbook, relying on a piece of chalk.

Chapter 38 This kind of thing can be addictive!

"Lagrange's median value theorem, by its name implies, its prover is Lagrange." Lin paused, wrote Lagrange's name on the blackboard, and said with a smile: "In mathematics, Theorems and conjectures are generally named by the name of the proponent and the prover. In the future, if you see the name of an unfamiliar mathematician, and you want to know whether he is good or not, it’s very simple, just remember whether he was named after him. Mathematical conjectures or theorems will do.”

"Although not all great mathematicians have proved or put forward their ideas and theorems. But the mathematicians who named their conjectures and theorems must be amazing!" Upon hearing this, the students in the classroom smiled heartily. .

They think this substitute teacher is not bad, and his speech is very interesting and not boring at all.

"Before explaining the theorems, let’s get to know this mathematician. Lagrange is a French mathematician. He studied under Euler, the first mathematician at the time, and in the current online novels, the son or Daozi's candidate."

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

Lin Xian held the chalk, rolled up the sleeves of the windbreaker, with a confident smile on his face, and talked freely: "He has made important contributions to equation theory, truss-solving function theory, and number theory. Lagrange The median value theorem is one of many results. Okay, after introducing the prover of the theorem, let’s take a look at the conditions of this theorem at this moment..."

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

The scumbag boyfriend is now giving her a lecture, and the key is still very good.

This TM... who would believe it!

All are hallucinations.

It must be the way I opened it!

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

It was Lin Xian on the podium.

At this moment, Lin Xian was staring at her and said with a smile but a smile: "Student Yan Xiaoman, please answer, the relationship between Lagrange's median theorem and Taylor's formula."

Yan Xiaoman:???

She had been in a state of confusion just now, her mind was full of question marks, and she hadn't listened carefully to what Lin Xian was talking about.

Seeing her stupidly speechless, Lin Xian smirked: "Listen to the class and don't get lost. I don't want you to be the worst of the worst students I have ever brought."

The worst of the worst class of students?

Many students couldn't help but laughed out loud.

Hiss!

Yan Xiaoman's teeth tickled with anger, and she kept grinding her little tiger's teeth, and a pair of beautiful eyes flashed with dangerous light.

If things weren't right now, she would definitely kill the **** in one bite.

This **** actually made himself ashamed in front of so many classmates.

Hi, so angry!

But despite being annoyed, Yan Xiaoman was more shocked in his heart.

This self-sufficient and eloquent person on the podium is really his scumbag boyfriend?

If this TM is a scumbag, then what is it?

Learn Mo?

Or school disability?

...