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Chapter 3: A Single-Parent Family with a Shattered World View

"Can you solve this problem?"

After throwing the phone on the table, Ranger casually pulled out a piece of A4 white paper from the desk, on which was a printed Olympiad question.

It will take at least a few minutes to wait for Teacher Yuan to come over, and since I have nothing to do anyway, I might as well test this guy.

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

Qiao Yu glanced at the questions on the table and said nothing.

Langjie thought for a moment and said, "If you can solve it, I'll give you 100 yuan in cash."

Qiao Yu hesitated for a moment, probably thinking that since it was already like this, he should not refuse the money that was delivered to his door, so he replied: "For things like this, you have to pay first."

Lang Jie glared at Qiao Yu, but still opened the drawer again, took out a hundred-dollar bill and slapped it on the table.

Ah……

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

"Thank you, boss. This question is the continuation of the one they are going to talk about in today's class, right? The main thing to test is the comparison coefficients. First use the substitution method to simplify the equation, then use the hypothesis method to verify it, and then use the comparison coefficients..."

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

Perhaps because of the hundred dollars he had just put in his pocket, Qiao Yu didn't say anything more this time. He honestly moved the stool over, sat there and started solving the problem.

Five minutes later, Teacher Yuan had not arrived yet, but the A4 paper had already been handed over.

Seeing the handwriting, Ranger frowned subconsciously.

It's a very standard dog-bitten font. You can tell the writer was just doing his job. If you don't read carefully, you can't even tell the difference between 0 and 6.

If this were the college entrance examination, the examiner would have to grit his teeth and deduct a few points for this stroke, which would simply make the teacher's work more difficult. But the proof process and ideas are extremely clear, and there is no mistake at all.

"Can you think of any other solution?" After reading it, Ranger asked coldly.

Qiao Yu thought for a moment and answered casually, "You can first use special values, then construct the function, and then use the function's properties to analyze it. However, that solution is more complicated and requires more writing. It's unnecessary, right? It's only a hundred yuan. Why write it? My hands are sore."

Ranger really wanted to ask, "Your hands are sore after writing just a few words? How come your hands aren't sore after playing games all day?" But he held back.

After all, he was not Qiao Yu's substitute teacher, and the child was obviously rebellious. There was no point in saying these things except to intensify the confrontation between the two. It would be better to wait for the child's head teacher to come and understand the situation before saying anything.

To be honest, as a teacher he was really curious about the fact that Tieyi Middle School had such a weird student.

Mathematics is indeed a matter of talent, but to be able to solve the Mathematical Olympiad so easily, one must have studied mathematics seriously. Otherwise, no matter how smart one is, if one cannot understand those symbols, one will not be able to solve the problem. But this guy is a complete idiot, and does not look like a good student at all...

The office fell into awkward silence again. Just as Ranjie was considering whether to ask this guy to do another question, there was a knock on the door, and then a round-faced middle-aged woman walked in.

Very good, saved a hundred dollars.

"Hello, Teacher Yuan." Lan Jie stood up and greeted him.

"Hey, Mr. Lan, I'm sorry to trouble you."

Teacher Yuan said politely with a smile on his face, then his eyes fell on Qiao Yu who was still sitting there. He was immediately furious and said seriously: "Qiao Yu, you are still sitting there steadily? Stand up, let me ask you, didn't your mother say that you were not feeling well and were hospitalized? How did you end up in the Internet cafe and end up in the hospital?"

Lan Jie thought that with Teacher Yuan's attitude, the two would start arguing in the office. What he didn't expect was that Qiao Yu just stood up with a gloomy face, and then stood there quietly without saying a word.

This also made Lang Jie feel very relieved. At least when facing the head teacher, he did not put on that stupid temperament of a dead pig that was not afraid of boiling water.

"Look at yourself. What have you become now? Yes, your grades are not good, but the high school entrance exam is next month. Even if you can't go to a regular high school, you can go to a private school if you get a few more points. Otherwise, what can you do in the future? Are you going to rely on..."

The female teacher kept nagging until Langjie started to feel a headache.

He quickly said, "That teacher Yuan..."

"Hey, look, I was so busy scolding the students that I almost forgot that Teacher Lan was still here. How about I take him back first?"

"No, no, what I mean is, let the kid stay in the office for a while, and we can go out and talk?"

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

What do you mean?
Let the kids stay in the office while they go out to chat?
……

No matter how many questions he had in his mind, Teacher Yuan followed Langjie out of the office and to the corner nearby.

If it were any other student, Lang Jie would definitely let the student leave first, but based on his understanding of Qiao Yu, he estimated that as soon as he let Qiao Yu walk out of his office, the kid would slip away, so he might as well just leave.

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

"Math? How should I put it? Not very good. Let me put it this way. Qiao Yu's science grades are quite poor. He has never passed math, physics, and biology. But Chinese and English are okay. He can pass them occasionally. Once he even scored over 100 in Chinese."

Ranger frowned subconsciously. Is it okay to pass occasionally?
But when I thought about Qiao Yu being in Class 13, I felt relieved. After all, grades are determined by comparison. I'm afraid it would be difficult for most people in the class to pass? But the science grades are all very poor...

MMPD!

Although it was not in line with his identity, Ranger couldn't help but curse in his heart.

This guy really fooled everyone.

"Then how many points did he get in the biology test?" Ranjie asked.

"Let me think about it. Yes, it seems to be 18 points."

"One door?"

Teacher Yuan glanced at Lan Jie and said, "Total score."

Langjie was speechless again.

Wow, he got 18 out of 80. Lang Jie once again suspected that the boy did it on purpose and got a perfect score.

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

"Ahem..." Ranjie avoided the topic and asked, "Does this child come from a poor family?"

When he heard this question, Teacher Yuan's attention was diverted. He lowered his voice and said mysteriously, "Hey, when it comes to this, I don't know what to say. A single-parent family, and it's very strange. Do you know how old his mother is?"

"Huh?" Langjie was stunned. Why were they gossiping?
"Qiao Yu's mother is so young, she's only 34 years old this year."

"What? 34 years old?"

About the same age as him? He's not married yet, but other kids can skip classes and go to the internet cafe?

(End of this chapter)