26. definition domain

The first class of the first semester is math.

Ma Xiaoding was more excited than anyone else, and desperately slapped the table behind: "Yu Ge Yu Yu Ge! Later, do you want to run for math class representative? I plan to run for language class representative. It's better to be together with us, and both arts and science will blossom."

Song Yuzheng flipped through the high school compulsory one textbook, slouched his eyes lazily. Hearing what he said, he snorted, "You can bloom by yourself."

Xi Bowen was so frightened that he tried his best to persuade him: "This is no good, Brother Ma, the representative of the Chinese class is going to read it."

Ma Xiaoding has no self-knowledge and is triumphant: "Of course I know that I am going for this. How can I not show off after so many poems by memorization."

Xi Bowen weakly: "Don't do it."

The Bowen classmate who loves learning is about to cry, let me go, I don't want my high archaeological poems to write zero points silently.

The class bell rang, and the math teacher walked in with the lesson plan. He was younger than fifty, thin, bald, and wearing glasses.

Holding a thermos cup in his hand, he stood on the stage and took a sip of water first.

"Classmates, I am your math teacher this semester."

The emphasis of speech is also very long, making people sleepy.

Ma Xiaoding whispered from behind, "Are all math teachers all over the world have a face that makes people want to sleep when they look at it."

Song Yu felt that he was noisy and kicked his feet back: "Shut up."

Ma Xiaoding silently made a zipper gesture on his mouth with his hands.

The first class usually has no specific content. The math teacher slowly talked about his teaching plan, glanced at the class of people, "In this way, I will choose a class representative first. Does anyone volunteer?"

Ma Xiaoding was happier than anyone else, shaking his stool, his whole body restless, and frantically hinting, "Yu Yu Yu Yu Yu Yu! Go, Yu Yu!" In his heart, Yu Yu held the papers during such a summer vacation, not letting go, and was first in school. How can a strange man who is fighting trigonometric functions in the sky have no identity in the mathematics class?

More importantly, he wants to run for the representative of the Chinese class! Shuangjie of Arts and Science sounds so fucking handsome!

Song Yu held the pen, wishing to turn his head and shave him.

Ma Xiaoding was so excited, his entire face exuded joy, and the contrast to the restless and sleepy students was a sharp contrast.

The math teacher's eyes fell on his face and his eyes lit up: "The third-to-last student in the fourth group, you can see that you are very excited, so passionate about the math class, you are the representative of the math class.

"..."

Ma Xiaoding's cheerful smile solidified on his face.

Ma Xiaoding, who was awarded the position of representative in mathematics class, finally calmed down. After that, he paralyzed for a class, and his whole face was full of love.

Song Yu twitched the corner of his mouth.

The bell rings after class.

After the math get out of class was over, Ma Xiaoding ran faster than anyone else, and followed the pace of the math teacher, wishing to fly to the office to die.

Song Yu leaned at the table and took notes. He did the papers some time ago, all to find the feeling. Now that the book is in hand, he began to systematically organize the knowledge context.

Halfway through the writing, it was stuck in a Venn diagram formula, and I used a pen to poke Xie Sui next to him: "Is this right?"

It just sounded at the same time as him, and there was a girl's voice.

"Student Xie Sui, can I ask what is a domain?"

The voice is sweet and soft and charming.

Song Yu held the pen for a while, looked up, and saw a girl with a single ponytail beside the hallway of the classroom holding a pen and a math book, her face blushing, and her eyes brightly looking at Xie Sui. She is very good-looking, and only women who are particularly confident can take the initiative.

Xie Sui slept, and was awakened by Song Yu with a pen. As soon as he opened his eyes, the dark and deep eyes were thin and cold.

Seeing the textbooks, desks, and classrooms in front of me, I felt dry and gloomy.

The autumn wind blows the curtains into the classroom. The boy's eyelashes trembled, and the emotion in Peach Blossom's eyes was deep. He turned to look at Song Yu: "What's right?"

Song Yu was still holding the pen, and silently pointed to the girl who was completely ignored by him and was a little embarrassed. "Why don't you answer her first what is the domain of definition?"

The girl laughed hard, and said again: "Xie Sui, I didn't understand the explanation in the book."

Xie Sui glanced at Song Yu in silence. He tilted his head and smiled at the girl, gracefully alienating: "Sorry, I don't understand either."

"Maybe you can memorize it."

The tone is clearly understatement, but I always feel that it is insinuating people are stupid.

The girl's smile became stiffer, and her fingertips with the pen were a little white. She lowered her head and whispered, "Oh, okay."

Song Yu watched the whole process.

Watching her trot back to her seat, then she was annoyed to cover her face with a book, and was comforted by a group of sisters beside her with a smile.

He suddenly felt a little itchy throat and wanted to say something.

For example: "You have lost a suitor like this."

Another example: "You really don't know what the domain is?"

The last thing Xie Sui lacked in his life was the suitor. He glanced at Song Yu lightly and said, "I know, but I don't want to answer."

Song Yu: "...oh."

Xie Sui stretched out his hand, and pulled his scribbled mess to summarize and summarize where he thought of writing: "What did you want to ask me just now."

Song Yu was moved by him.

Brothers are like brothers, and women are like clothes!

"this one!"

Xie Sui took a pen and wrote down the formula he asked. I randomly changed some things on the above, and instantly there were concise and clear connections among many knowledge points.

After taking over the notebook, Song Yu sighed, "As expected, thank God." But he was still curious: "Why didn't you answer? I know the definition domain, why didn't she ask me by the way."

It's a pity that the first opportunity to communicate with female classmates in high school passed by.

Although on the forum, Song Yu is conscientious, and the lonely scumbag is about to overflow across the screen, in reality, Song Yu is still willing to answer questions for the female classmates in the same class. Don't ask, ask is to be helpful.

Xie Sui looked at his regretful expression, his eyes narrowed slightly, and his lips curled with a smile, his tone was light: "Too basic, I usually only answer Lagrange."

Song Yu: "..."

Damn you.

Is this terrible?

Before the get out of class bell, Ma Xiaoding came back like a ghost, while holding a delicate strawberry cake in his hand.

Looking at his face on the ground, he knew that the negotiation was not completed, and the math class representative was appointed.

Xi Bowen couldn't hide his joy: "Oh, don't be sad, Brother Ma, aren't the representatives of the Chinese class and the math class both class representatives? No difference, no difference."

Ma Xiaoding was about to cry: "Can this be the same! Mathematics class means failing in mathematics, and I have to go to the office to send him homework every day, let me die!" But before he died, he was still aggrieved with the cake in his hand. Put it on Xie Sui's table, "Thank God, this was brought to you by a girl from the class next door on the road. It's pretty long, and it's probably the second class flower. I think you can eat it with confidence."

Xie Sui lowered his head and glanced at the cake.

There was also a sticky note with a faint fragrance on it, and the girl's handwriting was beautiful, with a smiling face beside "Thank God, hello".

Xi Bowen's real name is admired: "Thank God, this is too popular."

Song Yu tutted, and he just said, there is no such foolish cannon fodder like Zhu Zhixing, Xie Sui's high school life must be particularly vigorous. The first grade is the school grass. In the campus age, it is definitely the one who swept the whole school.

Xie Sui didn't even think about it, and said, "Thank you, but I don't eat sweets."

Ma Xiaoding's eyes lit up, hypocritically: "That would be a shame, but they have been delivered to me, and I am too embarrassed to send it back. Why don't I help you--"

Song Yu has already raised his hand: "Give it to me. I haven't eaten the cake from a girl yet."

Ma Xiaoding cried and swallowed the words behind him silently. What else could he say when Brother Yu grabbed food from him.

The corners of Xie Sui's lips were slightly smiling.

He tilted his head and said to Ma Xiaoding, "You eat."

Ma Xiaoding: "???"

Song Yu: "!!!"

Song Yu: "What's going on—"

Xie Sui opened the math compulsory one textbook, and pointed his slender finger to the domain of definition.

"Come on, I found that I really don't seem to know what the definition domain is. You can explain it to me."

Song Yu shut up immediately. After several days of continuous enthusiasm for learning, he finally had the opportunity to show himself, and he moved his head excitedly: "The definition domain is actually very simple. I will find the question for you and talk more. clear."

"..." Xi Bowen and Ma Xiaoding.

"Brother Yu is too coaxing."

Ma Xiaoding was eating a sweet strawberry cake with a spoon in the back. His heart was hurt by mathematics, and he finally got some comfort.

Xi Bowen lowered his glasses and his eyes were full of admiration: "This is probably the difference of Xueba. There is nothing that can't be solved. If one problem doesn't work, there are two problems."

"Niu batch!"

Ma Xiaoding agreed.

The more certain, Yu Ge is really a master of learning.

The last session of the morning was O'Yilian's class. Last time she gave a self-presentation. She even forgot the introduction between the students, so this first English class became a class meeting.

Ou Yilian is still stepping on high heels and wearing a skirt, showing up with the smell of perfume.

"The time was too rush last time, and the people in our class hadn't introduced themselves well. Well, in this class, let everyone get to know each other first."

"Starting from the first group, s-shaped order, come, come on, introduce yourself on the podium, and talk about your name and hobbies."

The first girl was a little shy on stage and gave a speech. She spoke very quickly, saying hello everyone, and then she blushed and stepped down after she reported her name. Wang Ci didn't come to school today, and took his little brothers to a row of seats. On the first day of school, he would not give face to the head teacher, but Ou Yilian didn't bother a word, and looked free to let the next one continue.

Compared to the restrained girls, the boys are more cheerful, but they are also very simple.

Ou Yilian frowned, not very satisfied with the effect, "Why are you so shy, and you have to stumble when you introduce yourself, so let's write your own name and not introduce yourself. Everyone comes on stage to introduce their own tablemates," You won't be shy when talking about others."

The same table was chosen by myself, and most of the junior high schools knew it. Now the atmosphere became lively, and it was all kinds of damages on stage, with witty words and different laughs.

According to the s type, Ma Xiaoding and Xi Bowen are the first to speak to their group.

Ma Xiaoding was always the happiest person in the audience. He said that he was introducing the same table, and in the end he mentioned two blog posts, and the other messy Balabala, or O Yilian gritted her teeth, yin and yang impatiently drove him off.

When I arrived at Xi Bowen, the poor nerd stumbled for a long time: "My name is Xi Bowen, a knowledgeable blog, and a language writer. My tablemate...the same table..." facing the former junior high school Ba Xian At the same table, characteristics and impressions, all you can say is: "He... he is now a representative of the math class."

Ma Xiaoding: "..." On the day, which pot should not be opened and which pot should be used.

When it was Xie Sui and Song Yu's turn, the class fell silent. After all, they were the ones who focused on the audience's sight as soon as the school started. They still don't know their names. The girls held their breaths and concentrated, and some of the boys who played games raised their heads.

Song Yu went up first.

Seeing that it was him, Oylian looked cold, and she was already looking down at her phone.

I wrote my name on the blackboard with chalk.

Song Yu turned around and threw the chalk into the box, concisely: "Song Yu, a metaphor."

Ma Xiaoding started booing and applauded desperately: "Oh oh oh oh oh oh oh oh oh oh oh oh oh oh oh oh oh oh oh oh oh oh oh oh oh oh oh oh oh oh oh oh oh oh oh oh oh oh oh oh oh oh oh oh oh oh oh oh oh oh oh oh oh oh!

In the silence and shock of the class, it was like a sand sculpture.

The whole class: "..."

Song Yu looked at him like a fool.

Probably the only shame that came out, Ma Xiaoding chose to close the wheat again.

The classroom is quiet.

Song Yusheng is beautiful, his skin is white and transparent, his pupils are light and his pupils are light in color, he is beautiful and clean, but he always speaks with perversity. Standing on the podium, unspeakable handsome.

Song Yu is a metaphor.

Sitting at the podium table is a girl with draped hair, star hairpin, round face, very cute. His eyes widened when he said the name, and he was stunned for a long time.

People are still dumbfounded.

In the quiet classroom, her voice is particularly obvious.

"Yes... is that my husband Yu's metaphor?"