"Dingling, Dinglingling..."

The second class ringtone rang. Although many schools now have changed to music, the most traditional ringtones are more ritualistic, just like you are in the exam room. You will either feel relieved or feel uneasy when you hear this ringtone.

The students in the corridor also walked slowly to the classroom. In the classroom, the students also took out math books, math papers and notebooks.

As usual, the students of Class 1 of Senior High School were quietly waiting for Teacher Huang who came to teach them.

Su Chen walked to the fifth floor with a light pace. I have to say that there are quite a lot of stairs in the school. I ran in the morning, but now my feet are still a little sore.

Su Chen finally climbed to the fifth floor, looking at the empty hallway and the classrooms were as quiet as a cicada. It seemed that the school's academic style was still good. Only the sound of the female teacher's high heels came from a distance. Su Chen heard it was quite pleasant, but this sound sounded like a nightmare to the students.

Su Chen let out a long sigh, tidied up his clothes, and strode towards Class 1, Grade 3.

As soon as Su Chen walked into the classroom, there were many shocking and suspicion coming from the classroom.

"Hey, why is the physical education teacher here?"

"Isn't this the physical education teacher yesterday? Why did he come?"

The girls chattered and whispered.

Gong Nana, who had seen Su Chen in the morning, did not speak out. Although she also wanted to know why Su Chen came. But as the squad leader, she still knew how to abide by discipline.

"Nana, do you know why?" A girl with a little baby-fat face asked Gong Nana.

This girl is Gong Nana's deskmate, named Zhou Xiaoxiao. Because she is a little baby fat and likes to wear buns, her classmates like to call her Xiaolongbao. Of course, the reason why she calls her Xiaolongbao instead of big steamed buns is mainly based on the fact that several male classmates in the class observed the ups and downs of her indescribable place, and collectively gave her the nickname "Xiaolongbao"!

"I don't know either." Gong Nana replied truthfully in a low voice.

"Have you adjusted the class?" The girl who called Zhou Xiaoxiao suddenly opened her eyes wide and seemed to have guessed something, and said happily.

"Oh~~~! You're taking physical education class!" The boys sitting in the back row of the classroom were not as quiet as girls. The first thing they thought of when Su Chen came in was that they didn't have to take math classes and could play basketball in physical education classes. As long as they didn't have to sit in the classroom to teach, they were all happy, so now they were very happy and did not abide by the class discipline.

Su Chen walked to the podium and placed the mathematics study book on the podium. Then he looked at the people in the classroom.

"Everyone is quiet, listen to me!" Su Chen raised one hand and pressed down, signaling everyone to be quiet.

Suddenly, the classroom became quiet.

"That's right. Your teacher Huang is sick and needs to go to the capital for treatment. I will teach you this class this morning. Who will teach you the math class in the future will be decided until the school meeting is held at noon before deciding. But I will teach this section." Su Chen explained the matter concisely.

"Teacher, teacher, is that physical education class?" the tall boy in the back row asked with his hands raised high.

"That classmate, put your hand down first, I can see that you don't have to raise it that high." Su Chen signaled the boy in the back row to put down his hand and said.

"Hahaha", the classmates in the class laughed when they heard Su Chen's words.

Su Chen: "This class is still a mathematics class. Although I am a physical education teacher, I still have this confidence in the mathematics courses I teach you."

"Oh!" After hearing this, most of the students in the class were deflated. They thought they could relax, but they never thought they would still take math class.

"You may not believe it when you say it. Our math is taught by the physical education teacher." A classmate used a sentence on the Internet, making all the students around him laugh.

"Okay, let's take the class seriously. Where did you Teacher Huang tell you?" Su Chen asked again, comforting the depressed student.

"Corresponding points. However, yesterday, a mock exam teacher had not finished his review yet." The students said angrily.

Su Chen also listened to a rough idea. The high school elective textbooks also have calculus learning, but they are not involved in depth, that is, learning the roots of the derivative sum of the function when the equation is equal to zero or the limit.

But I was just a class for myself. Since they still had the test papers that had not been finished, I just finished explaining the test paper to them. Thinking of this, Su Chen said, "Okay, everyone will take out your unfinished papers. Let's review the papers for this class."

"Who gives me a paper and then check it out with my deskmate?" Su Chen found that he had no papers, so he asked.

At this time, Gong Nana stood up, picked up her own paper and walked towards Su Chen, then handed the paper to Su Chen and said, "Teacher, use mine." After that, she returned to her seat.

I left a group of people to watch. What's wrong with the class leader? She wasn't so proactive before. Studying was her top priority. As long as she didn't ask her for it on her own initiative, she wouldn't make any contributions. It's not like Gong Nana doesn't know how to share knowledge with her classmates. It's just that Gong Nana's grades are good, and there are many things she has to do. If you don't take the initiative to explain or borrow things to her, she won't take the initiative to help others. This is also human nature.

So she was a little too proactive today, and the classmates were a little uncomfortable for a while.

"Thank you. Take a look with your deskmate." Su Chen took the test paper and smiled back to Gong Nana.

Su Chen picked up the mock test paper and started reading it. After reading the multiple-choice questions in the previous ones, it felt very simple.

"What do you think are there any questions that need to be explained in multiple-choice questions?" Because there is no math score statistics table for their class, it is not clear where they are wrong, so Su Chen asked it directly.

"Question 3, Question 5, Question 10..." Various sounds suddenly sounded in the classroom. However, most of them focused on these three questions.

There are 12 multiple-choice questions for this mock test, and a total of 5 points for a multiple-choice question is 60 points. The proportion is very large.

"Okay, the third question is right, let me see." Su Chen said.

The third question is a trigonometric function question. Su Chen took a look, but did not explain the answer. He picked up a pen and explained it on the blackboard.

In less than a minute, Su Chen finished the explanation.

"Do you understand? Such a simple question should not be wrong. Just put the formula on top to get the answer." Su Chen wrote out all the formulas of the trigonometric function on the side of the blackboard.

The students below are now beginning to believe that this physical education teacher is really qualified to teach them mathematics. A physical education teacher can write all the formulas of trigonometric functions, which cannot be false. Many of them have not memorized them completely, and some people even opened the books to find the formulas and compared with those written by Su Chen on the blackboard.
Chapter completed!