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Chapter 12: Once you get the medal, I will let you take revenge!
Although his mind was a little confused, when Qiao Yu sat down at the table and opened the "Introduction to Riemann Geometry", his mood immediately calmed down and he immersed himself in this mathematics book that he could not understand before.

When it comes to self-study, Qiao Yu actually has his own methods, especially for foreign languages.

The former metaphor means listening more, memorizing more, and speaking more.

I bought a foreign language dictionary online, sat in front of my computer, listened to and read the lines in the movie over and over again, looked up new words in the dictionary on the spot, and memorized them. I read some grammar during breaks.

At first it might take you a week or two to finish a movie.

Then the progress gradually accelerated, and by the time he could finish watching a new foreign language movie in three hours, he had basically mastered the listening, reading and writing skills of a foreign language.

Mathematics is not the same.

In fact, Qiao Yu knew very early on that the reason why he felt that mathematics was getting harder and harder was that mathematics was a subject that required prior knowledge. So this time he reopened "Introduction to Riemannian Geometry" not to learn the content directly, but to figure out what prior knowledge he needed.

So Qiao Yu turned on the old computer at home, and when he encountered a concept he didn't understand, he would look it up on the Internet and then mark it down.

Half an hour later, the book was filled with densely packed records.

Calculus, linear algebra, differential geometry, topology, and differential equations, especially on manifolds.

Of course, there are more detailed things like multivariable calculus, especially integrals and derivatives on curves and surfaces; linear algebra's vector spaces, matrices, linear mappings, eigenvectors, and so on.

The good news is that Qiao Yu has learned some of the two subjects, calculus and linear algebra, in bits and pieces some time ago, and he doesn't feel they are particularly difficult.

The bad news is that I haven't studied differential geometry, topology, and ordinary differential equations and partial differential equations. Even if I don't need to learn so much now, I will definitely have to learn it if I really want to rely on math competitions to get into university in the future.

The worse news is that after getting a rough idea of ​​what these subjects are on the Internet, Qiao Yu discovered that none of these subjects seemed easy to deal with.

If he could pass the Mathematical Olympiad, earn some money from the school, and then be admitted to Yanbei University to study foreign languages, that would be great. Anyway, he just wanted a diploma from Yanbei University...

Just as Qiao Yu was having unbearable thoughts in his mind, the door was suddenly knocked twice and then pushed open. The next moment, Xia Keke's little head poked in.

"Brother Qiao, my grandma is here to call me home."

"Oh, then you should go home quickly!"

"I came to see how you are doing."

"You know how difficult advanced mathematics is? How can you learn a lot of it in just half an hour?" Qiao Yu turned his head and said seriously, intending to find an excuse for his fear of difficulty later.

"Is that so?" Xia Keke answered, thought about it, then went into the room and closed the door casually.

"What are you going to do?" Qiao Yu looked at the little girl rushing towards him vigilantly, and quickly stood up and took a defensive stance.

No one could understand this little girl better than him. Under her innocent face, she had a heart that was only interested in bringing chaos to the world. Although he was indeed naughty when he was a child, many of the bad ideas came from this little girl, but in the eyes of adults, he was the main culprit.

The room was so small, and the next moment, Coco was standing next to him.

Qiao Yu was already 1.75 meters tall, but the little girl in front of him was only a forehead shorter than him. And before Qiao Yu could react, the little girl suddenly stood on tiptoe...

First, a fragrance came from the tip of my nose, and then my lips felt soft, with a hint of coolness, and it seemed a little sweet.

Damn, this happened too suddenly...

Didn't have time to use flash...

When Qiao Yu reacted, he saw the little girl opposite him staring at him with bright eyes and a half-smile.

He - a 15-year-old single, hot-blooded, good boy, was actually taken advantage of like this?

What a big loss! He suddenly wanted to take revenge!
"I know you're angry, but if you dare to talk back, I'll call for help!" the little girl said confidently. "Shame on you!" Qiao Yu felt so angry that he shivered, but he didn't say it out loud.

He is a recognized bad boy in the family compound, while on the other side is an incredibly beautiful girl with excellent character and academic performance and a bright future. With the help of stereotypes, the other side has a huge advantage in public opinion.

"But if you can really win a prize in the national Mathematical Olympiad, I will allow you to take revenge." The little girl said softly with pride.

"Coco, it's late. You should go home and sleep. You have classes tomorrow." The old man's voice came from outside the door.

"Okay, okay, I got it!" The little girl responded loudly, then made a face at Qiao Yu, turned around quickly and rushed out.

As I walked out of the room, I could still hear the old man muttering outside the door that had just been closed: "It's not good for a little girl to run into a boy's room."

"I know, I was just saying goodbye politely, grandma, you always taught me to be polite!"

He lost today, miserably.

"Hey, why is your face suddenly so red?" Qiao Xi's inquiring gaze as she leaned on the sofa made Qiao Yu's defenses slightly broken.

"I blush?"

"Go look in the mirror. You look no different from the monkey's butt on Mount Emei."

"Maybe it's because the weather is too hot. I'll go brush my teeth first." Qiao Yu answered calmly, then rushed into the bathroom, stood in front of the mirror on the sink, and took a look. Sure enough, his face looked red and looked very hopeless.

Qiao Yu took a deep breath and picked up the toothbrush.

"What happened in the room just now?"

Qiao Yu turned his head and saw Qiao Xi leaning against the bathroom door with a gossipy look on her face.

"It was just a goodbye, what else is there? What did you talk about outside just now?" Qiao Yu felt a little guilty.

"Qiao Yu, something's wrong with you!" Qiao Xi suddenly said.

"Huh?" Qiao Yu was surprised.

"You never cared about what I talked about with Keke before!" The tone in which Qiao Xi said this reminded Qiao Yu of the classic line in the anime Detective Conan: "There is only one truth."

Qiao Yu calmed himself down and replied calmly: "What does this mean?"

Then I started brushing my teeth step by step, and the blush on my face began to fade away slowly.

"Yeah, that's right."

Qiao Xi muttered to herself, and then continued to talk to herself: "Actually, I didn't talk about anything with Keke just now. She just kept asking about Teacher Lan's home visit. I told her a little bit, and then I said that I don't know if you will forget your mother after you become successful and get married.

Keke said she believes you won't do that. Even if you are really heartless in the future, she will take care of me when she grows up. Look, how considerate that girl is. Unlike you! You always make fun of me. By the way, the little girl didn't sneak into your room and play the trick of a little girl confessing her love, did she? "

Qiao Yu paused while brushing his teeth, then turned his head expressionlessly, glanced at his mother who seemed to be smiling, turned around, picked up the door handle, closed the bathroom door directly, and locked it...

"boom!"

"Crack!"

The world is finally quiet.

(End of this chapter)