"Can you solve this question?"

After throwing his phone onto the desk, Lanjie casually pulled out a piece of A4 white paper from his desk, which was a printed Olympic question.

It will take at least a few minutes for Teacher Yuan to come over. It is still idle, so I might as well take the test of this guy.

This is an example question prepared in advance for children in the Olympic class on Friday afternoon, and it is also a very classic Olympic question. The question stem is: f(x) is a function on Q, (1)f(1)=2, (2) For any x, y∈Q, there is f(xy)=f(x)f(y)-f(x+y)+1. Find f(x).

Qiao Yu glanced at the question on the table without saying a word.

Ranjie thought for a while and said, "I'll give you a hundred yuan in cash after it is solved."

Qiao Yu hesitated for a moment, probably thinking that it was already like this anyway, so he should not give up the money delivered to the door for nothing, so he replied, "Those things require money first."

Ranjie glared at Qiao Yu, but opened the drawer again, drew a hundred ticket, and slapped it on the table.

Oh……

He finally saw a smile on Qiao Yu's face.

"Thank you, boss, this question is what they will talk about in today's class? The main test is comparison coefficients. First use the substitution method to simplify the equation, then use the hypothesis method to verify, and then use the comparison coefficients..."

Langjie was too lazy to listen to the boy's nonsense, so he handed over a pen and pointed to the stool at the desk next to him: "Go and move a stool by yourself and write it in the blank."

Perhaps because of the 100 yuan he had just put in his pocket, Qiao Yu did not talk nonsense anymore this time, and honestly moved the stool over and sat there to start solving the problem.

Five minutes later, before Teacher Yuan arrived, the A4 paper had been handed over.

Seeing the font written, Ranger subconsciously frowned.

A very standard dog chewing font, it can be seen that the writer is simply dealing with errands and not carefully identifying them. No matter how 0 or 6 is, it is impossible to distinguish them.

If this is the college entrance examination, the teacher who scored the papers had to grit his teeth and deduct a few points first, which was purely to increase the difficulty of the teacher's work. However, the proof process and idea were extremely clear and there was no error.

"Can you come up with other solutions?" After reading it, Ranjie asked coldly.

Qiao Yu thought for a moment and replied casually: "You can use special values ​​to bring in first, then construct the function, and then use the properties of the function to analyze it. However, the solution is more complicated and there is more things to write. Isn't it necessary? It's just a hundred yuan, but it's still written? My hands are sore."

Langjie really wanted to ask, "You will get sore when you write these words? Why are your hands not sore when you play games for a day?" But he still held back.

After all, he is not Qiao Yu's substitute teacher, and the child is obviously rebellious and has no meaning to say that this is not only aggravated the confrontation between the two. Let's wait until the child's head teacher comes and he has learned about the situation.

To be honest, he is really curious as a teacher to have such a weird student at Tieyi Middle School.

Mathematics is indeed a talent, but being able to solve Olympiad problems so easily must have studied mathematics seriously. Otherwise, no matter how smart you are, you will not be able to understand those symbols, and you will never be able to solve the problem. But this guy is just a stingy person and doesn’t look like a good student at all...

So the office fell into an awkward silence again. Just as Lanjie was thinking about whether to let this guy do the questions again, a knock on the door suddenly came, and then a middle-aged woman with round face walked in.

Very good, saving 100.

"Hello, Teacher Yuan." Lanjie stood up and said hello.

"Oh, Teacher Lan, I'm sorry, I've caused you trouble."

Teacher Yuan said politely with a smile on his face, then his eyes fell on Qiao Yu who was still pricking him. He was immediately angry and said seriously: "Qiao Yu, are you still sitting steadily? Stand up, I ask you, didn't your mother say you were feeling unwell and was hospitalized? Why were you hospitalized in the Internet cafe?"

Langjie thought that Teacher Yuan's attitude would make the two of them quarrel directly in the office. What he didn't expect was that Qiao Yu just stood up with a bad look on his face, and then stood there quietly without saying a word.

This also made Ranger feel very relieved.

At least when facing the head teacher, he did not show his temperament of being a dead pig that was not afraid of boiling water.

"Look at what you are now? Yes, your grades are not good, but you will be in the middle school entrance exam next month. Even if you can't go to the general high school level, you can get a few more points into private placements, otherwise what can you do in the future? Do you rely on this life..."

The female teacher started to talk, which made Lanjie feel a headache.

He hurriedly said, "That Teacher Yuan..."

"Hey, look, I'm just patronizing the training of the students, and I almost forgot that Teacher Lan is still there, why don't I take him back first?"

"No, I mean, let the kids stay in the office for a while and let's go out and chat?"

"Ah?" Teacher Yuan was stunned, obviously not understanding the situation.

What's the meaning?

Let the children stay in the office and they go out to chat?

...

No matter how many question marks there were in my mind, Teacher Yuan followed Lanjie to the outside of the office and came to the corner next to him.

If it were another student, Lanjie would definitely let the students go out first, but based on his understanding of Qiao Yu, he probably just asked Qiao Yu to walk out of his office, and the kid slipped away directly, so he would just go out.

"Teacher Yuan, I want to know Qiao Yu's situation. Can you briefly tell me? For example, how is his math grade in class?"

"Mathematics? Why don't you say it? It's not very good. Let's put it this way, Qiao Yu's science scores are quite poor, and he has not passed the courses in mathematics and physics. However, his Chinese and English are OK, and he can pass the exam occasionally. Once, he got more than 100 points in Chinese."

Ranger subconsciously frowned. It would be okay to pass the exam occasionally?

But when I thought of Qiao Yu in Class 13, I felt relieved again. After all, the grades were achieved through comparison. I am afraid that most people in the class would have difficulty passing? However, the science scores were very poor...

MMPD!

Although it was not in line with its identity, Ranger could not help but curse something very dirty in his heart.

This kid really tricked everyone.

"Then how many points will he get in the birthplace?" Lanjie asked afterwards.

"I think about it, by the way, it seems to be 18 points."

"One door?"

Teacher Yuan glanced at Lanjie and said, "Total score."

Langjie was speechless again.

Good guy, the total score is 80, and he got eighteen. Langjie once again suspected that the boy did it on purpose and scored the reverse full mark.

"Why are you so interested in his grades?" Teacher Yuan asked in surprise.

"Ahem..." Ranjie walked around the topic and asked, "Is this child's family conditions very bad?"

Hearing this question, Teacher Yuan was indeed distracted, lowered his voice, and said mysteriously: "Hey, when it comes to this, I don't know how to say it. Single-parent families are, and it's very strange. Do you know how old his mother is?"

"Hmm?" Lanjie was stunned. Why did he still gossip?

"Qiao Yu's mother is so young, she is only 34 years old this year."

"What? 34 years old?"

About the same age as him? He is not married yet, and his children can skip classes and go to Internet cafes?
Chapter completed!