Chapter 225: It's him? !

"Then I choose him!" Li Xiurui reached out and pointed at Cheng Nuo.
Cheng Nuo, who didn't know what he was thinking, was outside of the wandering things, feeling the sight cast by Liao Zhihang, the expression on his face couldn't help being taken aback.
Cheng Nuo got up from his seat without knowing the situation.
Liao Zhixing nodded, pointed to the topic on the PPT, and said to Cheng Nuo with a smile, "This classmate, can you do the above topic?"
Cheng Nuo hesitated, "Should... be it!"
The gloating expression on the fat Li Xiurui's face suddenly solidified.
No way!
Just now, he really saw that after Liao Zhixing asked everyone to start the question, Cheng Nuo didn't do anything except read the question for a while.
The notebook has been clean from class to now.
How could such a guy solve this problem. This guy is not acting!
Liao Zhixing didn’t care what Li Xiurui was thinking at this time. Seeing Cheng Nuo gave him an affirmative answer, he smiled and waved to Cheng Nuo,
In that case, this classmate, you can come up and tell everyone about yours. Let's solve the problem."
The expression on Cheng Nuo's face was a little unnatural.
Originally, I was in the wrong classroom, not a student in the math department.
According to Cheng Nuo's original plan, he planned to finish the first class safely, and then sneak back to the original classroom by taking advantage of the time between classes.
but now……
Since being called by Liao Zhixing, Cheng Nuo can only bite the bullet.
A student from the Department of Finance, to solve a high-level problem that the Department of Mathematics would learn, should be... no problem!
I just don't know, if the students in the math department in the classroom know that a difficult problem that they are thinking about will be told to everyone by a financial student who can't help it. What is the expression on his face?
"Why, is there a problem?" Liao Zhixing said softly when he saw Cheng Nuo's face.
"no no……"
Forget it! let's go!
Cheng Nuo bit his scalp, very reluctant to walk to the podium step by step.
This limelight, to be honest, Cheng Nuo really doesn't want to show up!
"Come on, this classmate, let's start your explanation!" Liao Zhixing took the initiative to give up the position of the podium to Cheng Nuo, standing on the side leaning against the door.
The first row of the classroom. After racking his brains, Zhao Yang, who had just solved the problem in seven or eight minutes, heard Liao Zhixing say that a student in his class had started to explain the problem. He wondered who was able to figure out the problem in such a short time, and slowly raised his head.
However, when he saw the familiar figure standing on the podium, he seemed to see something unbelievable, his mouth widened and his eyes shrank suddenly.
I rub! How could this guy... appear here!
Zhao Yang hurriedly looked around.
Yes, this is the classroom of the Department of Mathematics! It is also about "Advanced Algebra"!
Cheng Nuo, Zhao Yang knew him.
It was almost a week ago that on the shooting range, Zhao Yang's gun skills were rubbed against the ground by Cheng Nuo.
If he remembers correctly, Cheng Nuo should be a freshman in the Department of Finance!
What kind of tricks came to our mathematics classroom?
I said that you would come, but still ran to the podium to talk about the topic.
A student in the finance department teaches math problems to a group of students in the math department.
This... is really too much!
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, showing a neat row of white teeth.
Zhao Yang kept a cold face and said nothing.
Kick the restaurant!
In Zhao Yang's heart, he thought that Cheng Nuo was here to kick the restaurant.
but……
Their mathematics department's restaurant is not so good!
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.
Topic!
This is not the first time Cheng Nuo has done this.
He sighed softly, picked up a piece of chalk, swish a few times, and wrote the title exactly on the side of the blackboard.
"Find all polynomials with complex coefficients satisfying f(x2)-f(x)f(x+1)=0?"
Perhaps in the eyes of other students in the mathematics department, this topic is not for students like them who have just started a high-level class on their first day. After all, only 30 minutes, they are not monsters.
It’s not bad if you can understand the knowledge taught by Teacher Liao. As for the proficient application, there is still a long way to go.
Therefore, as a student of mathematics, it is not enough to listen carefully in class!
If you want to make impressive results, you must spend your free time every day and devote yourself to the great cause of mathematics.
For example, when you go to the toilet, while peeing, you construct a parabolic equation in your mind to calculate the correct landing point.
When XXOO with the female ticket, don’t forget to use the spherical equation to calculate the size of the cup, and at the same time calculate your length and the depth of the female ticket. The difference between them is the Peano remainder in Taylor’s formula, Schlemilch-Roche (Schlomilch-Roche) remainder, or Lagrangian remainder, or perhaps, Cauchy remainder!
Keke, return to the topic, return to the topic.
Since it was a topic, Cheng Nuo naturally could not patronize and write on the blackboard alone.
He smiled at the corner of his mouth that he thought was very sunny~EbookFREE.me~, facing the more than 30 mathematics students under the podium, he wrote and preached.
"Actually, this subject cannot be said to be complicated."
"First, when f(x)=0 and f(x)=1, this equation obviously meets the requirements, there is no doubt about this."
"So, the remaining focus is on the case where the number of discussions is greater than 1. Right?"
Under the stage, everyone in the Department of Mathematics nodded.
Everyone knows this.
However, the key to the problem is how to discuss multiple situations where the number of times is greater than 1.
I saw Cheng Nuo speaking while writing on the blackboard.
"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), that is, 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 m is less than n, so a^m=a^n, so a^m·(a^(nm)-1)=0, a=0 , Or a is the unit root,...
Cheng Nuo's lecturing speed is very fast, almost the same as Liao Zhixing's speed.
Under the stage, 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 from his forehead, lowered his head and tried to verify Cheng Nuo's calculation steps, trying to find out the shortcomings of Cheng Nuo's explanation steps.
On the side of the podium, Liao Zhixing watched Cheng Nuo, who was quite self-explanatory, nodded in satisfaction.
Well, this child is worthy of focus!
Liao Zhixing felt that he needed to focus on Cheng Nuo in the future.
Recommended reading: The new book "Yuan Zun" by the God of Silkworm Potato, and the new book "The Great Avenue"