Tao Li is famous!

At least in the entire sophomore year of high school, he is completely famous!

Now the teachers of the second grade of high school know that there is such a mathematics internship teacher, not long after coming to the school, he helped the school win the first prize and the best design award in the first multimedia courseware design competition in Jiangsu Province in one fell swoop!

What is even more surprising to everyone is that one of the first prizes was actually won by physics teaching! A mathematics intern teacher has supported the façade of the entire physics teaching and research department, and it has to be said that it is very legendary.

This is the first time since Tao Li went to school that he was not known to everyone all at once because of his appearance. However, Tao Li believes that it won't be long before he will become a beautiful man who "combines talent and beauty" in everyone's eyes!

This is the inevitable trend of historical development, and mortals are irreversible!

After participating in the award ceremony of the Department of Education, this courseware design competition came to a successful conclusion for Tao Li. The two works he participated in the design were directly put on a subordinate educational resource website by the Department of Education for everyone to enjoy and learn.

Tao Li's work and life have returned to normal again, listening to lectures, studying, correcting homework, and of course, helping Ren Changjiang tutor at night, these things seem to have become the most important things in his day.

Li Jianneng, who entered the teaching and research department at the same time as him, has begun to teach independently with the consent of Zhou Zhihui. Tao Li also went to listen to that class, reasoning, as the first show, Li Jianneng didn't speak much, even if he was nervous, the key was that the lecture was unorganized, and even Tao Li could listen to it in a fog, let alone the students below.

But in any case, Li Jianneng has taken the first step as a real teacher, Tao Li has an empty stomach, but Chen Tianxiang has not made a clear statement that he will be independent substitute teacher, and Tao Li can only continue to study with the class.

"In the last lesson, we sorted out all the knowledge points of trigonometric functions, and from this lesson, we will enter the learning of the new chapter content, which is also the focus of the entire high school mathematics teaching content, and it is even more difficult, that is, the learning of conic curves in analytic geometry!"

As he spoke, Chen Tianxiang wrote the words "conic curve" on the blackboard.

It stands to reason that the content of the chapter on the conic curve should be the knowledge points to be learned in the first half of the first semester of the third year of high school, but in order to ensure that there is enough time for multiple rounds of review, Jinling Middle School stipulates that the Olympiad class must complete all the knowledge before the end of the second year of high school, while the ordinary class can choose whether to study this chapter or how much to study according to the actual situation of the students in the class.

As the 24th class of the Olympiad, it is natural that you need to finish the chapter on conic curves.

Before we get into this chapter, let's summarize the common curves that are included in conic curves. Can anyone say that? ”

Chen Tianxiang made a gesture of raising his hand and motioned for the students below to stand up and answer.

"Ellipse!" soon a student volunteered to stand up and replied.

"Very well, the ellipse is indeed our most common kind of conic curve, the same way, the ellipse is also the most popular knowledge point in the previous college entrance examination, from fill-in-the-blank questions to analytic geometry questions, it is possible to use the ellipse as the carrier, and the secondary theorem in the ellipse is also the most among all conic curves, so for the ellipse, we will focus on learning. ”

Chen Tianxiang tried to draw an ellipse on the blackboard while talking, but the image drawn for the first time was very irregular, it looked like a balloon that had been pinched and deflated, maybe Chen Tianxiang himself couldn't stand it, and after wiping it off, he drew it again, but after trying two or three times, he found that the ellipse he drew did not improve, and in desperation, he had to turn around and say to everyone embarrassedly,

"Let's just see, the teacher can't draw since he was a child, otherwise the teacher would be an art teacher now!"

It's not the first time that the students at the bottom have encountered this kind of thing, when he first went to three-dimensional geometry, Chen Tianxiang had already shown his drawing skills, a good tetrahedron, and he was stunned to draw a cone, and there were many jokes.

Tao Li, who was sitting in the back and listening to the class, didn't expect that Teacher Chen, who had such outstanding teaching achievements, would have such a shortcoming. Looking at the strange-looking oval on the blackboard, Tao Li couldn't hold back and almost laughed.

Next, some students successively said the rest of the common conic curves, including parabolas, hyperbolas, etc., Chen Tianxiang also drew a schematic diagram on the blackboard one by one, except for the simplest parabola, Chen Tianxiang drew a decent one, the rest of the curves, in Tao Li's view, can only be described as "miserable".

At the end of the class, I didn't hear much about the substance of Tao Li, but my attention was almost attracted by the abstract "paintings" on the blackboard.

After class, Tao Li followed closely behind Chen Tianxiang, looking like he wanted to speak and stopped.

"If you kid have anything to say, just say it, grinding and chirping, I look uncomfortable. Chen Tianxiang stopped and said angrily.

"Teacher Chen, the pictures you draw are really ugly! Even uglier than yourself! I have never seen a math teacher with drawing skills worse than yours!"

Tao Li forced a smile and quipped while covering his mouth.

"I'm a math teacher, not an art teacher, what's the use of drawing pictures that look good, good drawings, but bad lectures, it's not just useless!" Chen Tianxiang quibbled.

"Yes, yes, Teacher Chen taught us!" Tao Li said with a smile and pretending to be serious.

"Hey, you kid's wings are stiff, aren't you! You draw well, you're on it!" Chen Tianxiang rolled his eyes, but in the next second, he looked at Tao Li very seriously,

"Well, in the next math class of Class 18, you will teach them the content of conic curves! I want to see what you can say after listening to the class for so many days!"

Hearing Chen Tianxiang say this, Tao Li didn't know how to answer for a while, "Why did you suddenly remember to let me go to substitute teaching?"

"The last time Li Jianneng substituted for class, the look in your eyes when you sat in the back and listened to the class was like staring at the little girl. Don't think I don't know, is there some complaint in my heart that I don't let you substitute for a long time?" Chen Tianxiang simply put his arm around Tao Li's shoulder, but because of the height difference, Chen Tianxiang struggled to hold it.

"There must be no complaints, but there is some confusion. I'm curious about how I suddenly remembered to substitute for me!"

"I'm not angry with you! How can you laugh at me today, tomorrow I will laugh back ten times and a hundred times! Why, I don't have confidence in myself!"

"I'm going to disappoint you, give you a night's time, and think about how to praise me tomorrow!

Tao Li put his right hand on Chen Tianxiang's shoulder, and at the same time gently pushed Chen Tianxiang's left hand away, just hugged him like this, and strode forward.