"Then I'll choose him!" Li Xiurui stretched out his hand and pointed at Cheng Nuo.

Cheng Nuo, who was outside the spirit object and didn't know what he was thinking, felt Liao Zhixing's gaze, and the expression on his face couldn't help but be stunned.

Cheng Nuo got up from his seat unbeneath.

Liao Zhixing nodded, pointed to the question on the PPT, and said to Cheng Nuo with a smile, "This classmate, will you do the above question?"

Cheng Nuo hesitated, "It should be...... I guess I can!"

The gloating expression on the chubby Li Xiurui's face suddenly froze.

No way!

Just now, he really saw that after Liao Zhixing asked everyone to start doing the questions, Cheng Nuo didn't do anything except look at the questions for a while.

The notebook has been clean from class to now.

How could such a guy possibly solve this problem? This guy isn't pretending!

Liao Zhixing didn't care what Li Xiurui was thinking at this time, seeing that Cheng Nuo gave him an affirmative answer, he beckoned to Cheng Nuo with a smile, "In this case, this classmate, you can come up and tell everyone your ideas for solving the problem." ”

The expression on Cheng Nuo's face was a little unnatural.

Originally, I was in the wrong classroom, not a math student.

According to Cheng Nuo's original plan, he planned to finish the first class safely, and then sneak back to the original classroom during the recess.

But now......

Now that he was called by Liao Zhixing, Cheng Nuo could only bite the bullet.

A student of the Department of Finance should ...... to solve a high-generation problem that only the Department of Mathematics can learn No problem!

I just don't know, if the students of the mathematics department in the classroom know, a difficult problem that they can ponder and meditate on will be told to everyone by a finance student who can't be beaten by eight poles. The expression on his face, what will it be.

"What, is there a problem?" Liao Zhixing saw Cheng Nuo's face and sighed lightly.

"No, no......"

Forget it!

Cheng Nuo stiffened his head and was extremely reluctant to walk to the podium step by step.

This limelight, to be honest, Cheng Nuo really doesn't want to be out!

"Come, this classmate, start your explanation!" Liao Zhixing took the initiative to give up the position of the podium to Cheng Nuo and stood on the side leaning against the door.

The first row of classrooms. Zhao Yang, who racked his brains and had just solved the problem in seven or eight minutes, heard Liao Zhixing say that a classmate in their class had begun to explain the problem. He looked up slowly, wondering who could figure out the problem in such a short time.

However, when he saw the familiar figure standing on the podium, as if he had seen something unbelievable, his mouth opened wide and his eyes shrank suddenly.

I'm rubbing! this guy...... How did it end up here!

Zhao Yang hurriedly looked around.

That's right, this is a mathematics classroom!

Cheng Nuo, Zhao Yang he knows.

Just about a week ago, on the shooting range, Zhao Yang's gun skills were pressed to the ground by Cheng Nuo and rubbed.

If he remembers correctly, Cheng Nuo should be a freshman in the Department of Finance!

But what kind of thing did you come to the classroom of our math department?

I said you would come, but you still ran to the podium to give a lecture.

A finance student lectures math to a group of math students.

This...... It's a bit excessive!

On the podium, Cheng Nuo naturally saw Zhao Yang sitting in the first row at a glance.

The eyes of the two met each other in the air.

Cheng Nuo grinned, revealing a row of neat white teeth.

Zhao Yang had a cold face and was silent.

Kick the restaurant!

In Zhao Yang's heart, he thought that Cheng Nuo was here to kick the restaurant.

But......

The hall of their mathematics department is not so easy to play!

If the strength is not enough, it can only be a joke.

Thinking of this, Zhao Yang's mood calmed down. He hugged his arms and quietly watched Cheng Nuo's movements standing on the podium.

Lecture topic!

It's not the first time Cheng Nuo has done this.

He exhaled lightly, picked up a piece of chalk, and with a few clicks, wrote the original title on the side of the blackboard.

"Find all complex coefficient polynomials satisfying f(x²)-f(x)f(x+1)=0?"

Perhaps in the eyes of other students in the mathematics department, this problem is not at all for students like them who have just started substitute classes on their first day. After all, it's only 30 minutes, and they're not monsters.

It is good to be able to understand the knowledge taught by Mr. Liao, but as for proficient application, there is still a long way to go.

Therefore, as a mathematics student, it is not enough to listen carefully in class!

If you want to make a great achievement, you have to dedicate your free time to the great cause of mathematics.

For example, when you go to the toilet, you can pee while constructing a parabolic equation in your mind to calculate the correct landing point.

When playing with the women's ticket XXOO, don't forget to use the spherical equation to calculate the size of the cup, and calculate your length and the depth of the women's ticket, and the difference between the Peano remainder in Taylor's formula, the Schlomilch-Roche remainder, the Lagrange remainder, or the Cauchy remainder!

Ahem, back to the point, back to the point.

Since it is a lecture, Cheng Nuo naturally can't patronize a person writing on the blackboard.

A smile on his lips that he thought was sunny was pulled out of his lips, and he turned sideways to the thirty-odd math students under the podium, writing and preaching.

Actually, it's not that complicated. ”

"First of all, when f(x) = 0 and f(x) = 1, the equation is clearly satisfying, there is no doubt about it. ”

So, the focus is on the case where the number of discussions is greater than one. Right?"

Under the podium, everyone in the mathematics department nodded in unison.

Everybody knows that.

However, the crux of the matter is how to discuss multiple situations with more than one number of times.

I saw Cheng Nuo writing on the blackboard while saying.

"From f(x²) = f(x)f(x+1), if a is the root of f(x), then a is also the root of f(x²), i.e. a² is the root of f(x)."

"So a, a², (a²)², ((a²)²)²,... are all roots of f(x). ”

"But if f(x) is non-zero, there are only finite roots, and there is m less than n, so that a^m = a^n, then a^m· (a^(n-m)-1)=0, there is a=0, or a is the unit root ,......"

Cheng Nuo's speed of speaking was very fast, almost about the same as the speed of Liao Zhixing.

Under the podium, most people just barely kept up with Cheng Nuo's problem-solving speed.

In the first row of the classroom, Zhao Yang, who was sitting on the very edge, wiped the sweat on his forehead, lowered his head and worked hard to verify Cheng Nuo's calculation steps, trying to find out the shortcomings in Cheng Nuo's explanation steps.

On the side of the podium, Liao Zhixing looked at Cheng Nuo, who was talking endlessly on the podium and had a bit of his own demeanor, and nodded with satisfaction.

Well, this child is worth focusing on!

Liao Zhixing felt that it was necessary for him to focus on Cheng Nuo in the future.