You don't need to explain the class of the first year of study and listen carefully, but there is no need for the substitute teacher to be too strict.

The class bell rang.

Wang Hao immediately used the teaching coin, quickly entered the teaching mode, and filled the entire classroom with a sunny and clear tone, "The content of this section is an image of the solution of a system of differential equations. ”

"There's a very classic example of a competition for tourism between the capital and the East Port, and both places are busy advertising to attract tourists."

"We can list the following system of equations, {x′=−x+by; y′=cx−3y}。 ”

"where x′ represents Donggang, y′ represents the capital, and x and y represent the off-the-norm travel advertising budgets of Shanghai and BJ, respectively......"

"In this example, we can analyze the first scenario, the East Port budget is positive, and the capital is calm."

"There's a point here that we need to ignore the budget of the East Harbor......"

“……”

When the course officially began, everyone was listening carefully, and they followed Wang Hao's explanation into understanding and thinking, going deeper and deeper, and slowly drawing an image of the solution of the equation system at the end.

The whole process is smooth and clear.

When they came back to their senses, most of the students understood, and some students couldn't help but be surprised, they found that the young teacher on the podium explained very clearly and accurately grasped every difficulty.

When there is a difficulty, the other party will explain it twice.

In this way, it makes it easier for them to keep up with the course and understand the new knowledge content.

Many students couldn't help but admire, "This young Teacher Wang is better than Teacher Zheng!" ”

"It's clear and easy to understand!"

"When I take Mr. Zheng's class, I always feel that I can't keep up, but when I listen to Mr. Wang's lecture, I seem to understand everything."

Students' feelings, in fact, are the difference in teaching efficiency.

The gap between teaching efficiency and undergraduate level is not large, because the knowledge at the undergraduate level is the foundation, and most disciplines only need to understand the basics, and students can keep up with the progress as long as they preview and listen carefully.

When it comes to graduate level, the difficulty of the course increases dramatically, and some students can't keep up with it even if they study hard.

Differential Equations is one such course.

This course requires students to have strong imagination and abstract thinking skills, as well as a very rich basic knowledge, and the more difficult it is to keep up.

When the difficulty increases, the difference in teaching efficiency will be obvious.

Wang Hao has ten years of experience in secondary education, he clearly knows how to teach, how to teach students, explain the same content, but also much stronger than the average lecturer, he also attaches great importance to the curriculum, will be carefully familiar with the lesson plan, for each step of the explanation will be carefully studied.

In addition, "The Gift of Teaching" can improve the comprehension efficiency by 20%.

This is also key.

In comparison with data, Wang Hao explained carefully for an hour, which is equivalent to Zheng Yaojun's explanation for an hour and a half, or even more.

In addition, Wang Hao's explanation methods are also very rich, supported by a steady stream of inspiration, and he can think of many vivid metaphors to assist teaching.

For example, when talking about a three-dimensional image problem.

Probably because of the students' thinking, which is related to the 'operation of the universe', Wang Hao immediately thought of the operation law of 'comets and stars', which is very similar to the three-dimensional image explained, so he took out the operation law of 'comets and stars' as an example, so that students can imagine and understand at the same time.

With practical examples, it becomes much easier to understand.

One lesson, two lessons.

Soon it will be over.

Many students feel that time is getting faster, and they just listen carefully to the lecture and pass by, whereas they usually have to desert a little.

Wang Hao finished the course content, quickly assigned the homework questions, looked at the time and said that there were five minutes left, and said, "The following is free time, the class will be out as soon as the bell rings, and you can come and ask if you have any questions." ”

"However, it's only ten minutes, and I still have class at ten o'clock."

Several students gathered around to ask questions.

Wang Hao explained to three students in a row, and their questions focused on a few difficult points, and then he simply went through a difficult example problem on the blackboard, and then turned his head and waited for the students to digest it.

At this time, the class is already over.

He noticed the girl walking over and asked with a smile, "This classmate, do you have a problem too?" ”

Gu Youyou immediately covered his face with his hands, and ran towards the door with his books in his arms, "No need, I'll ask you alone at night!" ”

"Huh!"

A group of students collectively turned their heads.

Wang Hao didn't react for a while, and he kindly reminded him, "Classmate Li Youyou, slow down......"

Gu Youyou's footsteps staggered.

She glanced back fiercely.

In Li Qian's strange laughter of 'heh, heh, he', she rushed out of the classroom with an indomitable momentum.

……

Nine forty o'clock.

Wang Hao came to the large classroom on the second floor on time, he found a chair to sit at the door, took the list of students and began to make records.

Physics students have heard the news.

Many students are full of apprehension because the campus network posts and reports are said to have been done by one of them.

Someone, named Ding Zhiqiang.

Ding Zhiqiang came very early, earlier than most students, he posted on the campus network, asked himself and the people in the dormitory next to him to help him, and also reported Wang Hao to the teaching affairs.

Then, how does it feel to come back to class?

If the report really had an effect, the most important thing is that Wang Hao didn't have anything, and he sat at the door of the classroom, watching the students enter the door according to the list.

This is...... Revenge, right?

Ding Zhiqiang understands it this way, and other students also understand it this way, and those who know the situation can't help but talk about him.

He pretended nothing had happened.

"Be quiet, don't say it's me~~~ Dear, kneel and beg for secrecy!"

"Otherwise, I'm going to die!" Ding Zhiqiang heard someone discussing, and hurriedly reminded him pitifully.

Wang Hao didn't know that Ding Zhiqiang did it.

When Ding Zhiqiang came to the classroom, Wang Hao still felt that he was a good student, and he arrived at the classroom fifteen minutes early.

He knew that it was a physics student who did it, and he only had one thought in his heart, "Bad students, how many floors do you have to carry in a bag of rice!" (Feel the pain!) ）”

During class, Wang Hao was not on the podium most of the time, but in front of the first row, in the aisle, and even at the back of the classroom.

Sleeping, playing with your phone, of course, write it down.

It is not permissible not to listen carefully, and he calls the students who are 'suspected of not attending the class' to answer the questions.

Ding Zhiqiang was called twice.

Wang Hao didn't mean to target him, but because Ding Zhiqiang was not in a state, he was always distracted because he was in a worried mood.

Twice I was called, and twice I didn't know what I was talking about.

Naturally, write it down!

In this class, the bad students of physics majors experienced what it means to be called a 'devil's class'.