my scientific age

Chapter 75 Did you go to the Bada Hutong today?
It was the first time she heard this kind of thing in the math problem set.

Hearing Lin Wan's words, Yu Hua finally realized that he was in a hurry before, and seemed to have forgotten to pack up the real test papers and answers. No surprise, the test paper results should have been known to Lin Wan.

If you know it, you know it, it's not a big deal, but it seems that Lin Wan can make an essay as the number one in the whole school.

Yu Hua smiled and explained: "No, my math grades were average before, thanks to this math problem set during this period of time, if you use a rigorous way of speaking, it is called the wrong math problem set, which was compiled by a person named Zhang San. , which contains a wealth of arithmetic and problem-solving ideas, which are very helpful. Today, I bought ten copies in the market next door, and I plan to sell them and make a profit."

"Zhang San?!"

Hearing the name that came out of Yu Hua's mouth, Lin Wan was stunned, and the name of the extrajudicial madman Zhang San flashed in her mind subconsciously.

Is this Zhang San the same person as the extrajudicial fanatic Zhang San who gave the kind reminder that day?
"What's wrong?" Looking at Lin Wan's surprised and surprised expression, Yu Hua asked with concern in his eyes.

Lin Wan came back to her senses, shook her head, suppressed her emotions, and turned her eyes to the ten wrong questions held in Yu Hua's arms: "It's nothing, Yu Hua, can you show me this set of wrong questions in arithmetic?"

"Of course, you can get a copy yourself. My hands are not very convenient. I think this set of wrong math problems is quite good. There are many rich problem-solving ideas on it. It can be called a quasi-arithmetic textbook."

Po Wang sells melons and brags about herself. Although she won't admit that Zhang San is her vest, Yu Hua still tries her best to tout the collection of math errors that he compiled by himself.

"Quasi math textbook? I'll see if it's as good as you said." Lin Wan smiled, took a step forward, and reached out to pick up a brand new set of wrong problems in math.

The cover is simple and ordinary, the format is in the rare sixteenth format, and five simplified characters are written on the surface.

A set of math errors.

Author: Zhang San.

Except for the two basic information, there is no information about the printing bookstore. Although Huangchenggen Bookstore is well-known in the printing industry of Peiping City, it cannot mark its own information on books, including name and location.

If you mark your own information, congratulations, you will be able to mention the police station's one-week package soon.

Lin Wan glanced at it, and immediately understood that this set of math problems in her hand came from a private printing of a pirated nature. It was impossible to trace the source. She was slightly disappointed. While opening the first page of the set, she asked Yu Hua. : "Yu Hua, do you know the author Zhang San?"

"I don't know." Yu Hua shook his head, denying it, and the reason for changing the set of wrong math questions from Yu Hua's version to Zhang San's version was naturally to protect himself.

In the early stages of accumulating strength, the vest used to hide the true identity must not be exposed.

And it's not hard to guess that Lin Wan, who secretly has another identity, seems to be looking for herself.

Yu Hua doesn't want to expose his relationship with the vest just yet.

"Okay..." Lin Wan had no choice but to give up. Instead of continuing to ask, she turned her attention to the first page of the set of math errors and read it carefully.

On the first page, there are five questions in total, mainly related to the problem of function types. With Lin Wan's arithmetic level, of course, these questions can be solved. However, the problem-solving ideas contained in these questions are very interesting, and they will make people from different perspectives. Understand the question type.

interesting.

Also fun.

After reading the five function questions on the first page, Lin Wan's eyes lit up. She felt that she had learned a lot of knowledge. She forgot about the idea of ​​finding the extrajudicial madman Zhang San, and turned to the second page.

It was still a function problem. At first glance, the difficulty increased a lot. Lin Wan carefully read the problem-solving process of each problem, and then focused on the final problem-solving ideas. She felt that she had gained a lot.

The whole person's spirit became more and more concentrated, and he was soon immersed in the knowledge world of Zhang's third edition of the wrong questions in arithmetic, unable to extricate himself.

Functions, trigonometric functions, algebra, analytic geometry, many knowledge points and question types that were not mentioned by mathematicians in the literature class, are all covered in this Zhangsan edition of the wrong set of mathematic problems, and the idea of ​​solving problems is even more wonderful.

Time passed without knowing it. At this time, Lin Wan, who was studying hard, suddenly felt that someone was poking her arm. She raised her head with a puzzled expression, and saw Yu Hua with a helpless face standing in front of her.

"Boss Lin Wan, it's been almost half an hour, let's go back to the classroom to see, there's no need to get tired here." Yu Hua shivered while holding the set of wrong math questions, showing a helpless look on his face.

This girl deserves to be the number one in the school. If nothing else, her talent for learning is top-notch. She can read a book for twenty minutes in the cold wind. If he hadn't reminded him, he thought Lin Wan could stand here for at least an hour.

"I'm sorry, this set of wrong questions was written so well that I forgot the occasion. Yu Hua, how much is this set of questions?" Lin Wan reacted with a slight smile on her face, and folded her hands before reading it. Zhang's third edition of the wrong question set in arithmetic, and asked Yu Hua.

A glimmer of light flashed across Yu Hua's eyes, and he responded, "Do you want it?"

"Well, it's very well written, and it can help me improve my arithmetic. When Mr. Tao lectures, he doesn't explain the knowledge points such as functions and analytic geometry in depth. My arithmetic level is not as good as Zhao Anyuan, nor yours." Lin Wan nodded. , said truthfully.

The three main courses of the literature class and the science class are the same, but they are different in the field of arithmetic.

Because the science class is mainly focused on mechanics, the math exam is more difficult, and the teacher will explain the details of various types of knowledge points in math.

The literature class is much simpler than the science class due to the low difficulty of the math subject exam.

This situation is beneficial to the students of the literature class, but this is not what Lin Wan wants.

Math is her weakness, and Lin Wan wants to make up for it.

"I'll give it to you if you want. However, if a classmate asks about the set of questions, I'd like to ask classmate Lin Wan to speak kindly. I'm counting on her to make some money, and I'm going to go out to school to get some more." A smile appeared on Yu Hua's face. .

"Sure enough, there is no free lunch in the world, okay, this question collection is mine."

Hearing Yu Hua's words, Lin Wan couldn't help laughing and crying. She didn't understand what Yu Hua meant. She turned her attention to the remaining set of math problems in Yu Hua's arms: "What's the price of the other nine books?"

"Why, do you want these nine books too?" Yu Hua was a little surprised.

Lin Wan said directly: "Just say how much money."

"One copy per piece, but I can only sell you eight copies. I want to keep one copy." Yu Hua stared at Lin Wan, thought for a while, and gave the price carefully.

Whoever sells is not selling, and it is a good thing to pack it directly when meeting a big customer, but I don't know if Lin Wan can accept this price.

A piece of a book is exactly twice as expensive as the originally envisaged book of [-] cents.

I have to say that after seeing the purchasing power of the students of Peking No. [-] Middle School, Yu Hua chose to increase the price.

If Lin Wan thinks it's too expensive...

Then don't sell it.

Anyway, the price of the title set must go up.

When Lin Wan heard the price, she was even more satisfied: "It's quite cheap. Give me the book. I don't have any money with me. I'll give you the money when I go to the library at night."

Cheap……

The corner of Yu Hua's mouth twitched slightly. This kind of pirated book with three innocence is only [-] cents at most. A piece of ocean can be regarded as the ceiling of the price, but in the eyes of other bigwigs, it can only be cheap.

Without delay, Yu Hua took out a set of wrong questions in arithmetic and handed the other eight sets of wrong questions to Lin Wan.

After the transaction was completed, Lin Wan, who was in a very happy mood, said goodbye to Yu Hua and left with a set of wrong questions. The extrajudicial fanatic Zhang San couldn't find it, but she found another Zhang San's book. The help in learning is not that big.

"I got off to a good start as soon as I arrived at the school. I didn't expect that I would still have money luck, not bad." Yu Hua looked at the big buyer who was leaving, and was very satisfied. From Lin Wan, who bought nine problem sets at one time, he could see that because of this The lack of professional teaching materials in the era, coupled with the insufficient level and gold content of Chinese teaching materials, there is a considerable market prospect for the set of wrong math problems.

The most important thing is that students' demand for quasi-tutorial materials such as problem sets completely belongs to the just-needed standard.

As long as it's just needed, it's fine.

Holding the last set of wrong questions, Yu Hua walked back and forth, and walked up the stairs to the classroom on the third floor. On the third floor, the classroom of the first class of Science was empty and there was no one else.

Most of the rest of the students went home and left the school to relax. Tan Qing, the poor child, has not returned for two consecutive weeks under his own arrangement. At this moment, he should stay in the library and enjoy the baptism from the tactic of the sea again and again. , Zhou Yuan went home today to visit relatives, and Fang Yu did not know where to go.

Without lingering, Yu Hua put the set of math problems in the drawer, turned around and left, heading for the bedroom.

Back to the bedroom.

"Squeak!" He gently pushed open the door that had been in disrepair for a long time, and a harsh rubbing sound came out, and Yu Hua stepped into the bedroom.

In the dormitory, Ji Han, Cao Wei and others were waiting for Yu Hua. The rich Liu Tao disappeared, and he wanted to go home to visit relatives.

"Yu Hua, you're finally back." Seeing Yu Hua who pushed in the door, Ji Han, who had been waiting for a long time, suddenly stood up with a look of joy on his face.

Cao Wei, who was reading a book, put down the book, winked at Yu Hua, and joked: "I haven't seen anyone for a long time, we thought you went to the Bada Hutong to be sassy and romantic, and feel the gentle township."

"Be honest, did you go to the Bada Hutong today and leave my brothers in the dormitory to eat ashes." Cheng Youping, who was next to him, agreed.

(End of this chapter)