When I am reborn, I just want to be a top student

Chapter 15 A wise man never falls in love

"It is known that the vector a=(cos1.5x, sin1.5x), b=(cos0.5x, -sin0.5x) and x belongs to [-π/3, π/4],

(1) Find (1)a*b and |a+b|
  (2) If f(x)=a*b-|a+b|, find the maximum and minimum values ​​of f(x). "

Early in the morning, when Guo Xing entered the classroom, he saw Wang Donglai doing questions.

As soon as he saw the title, Guo Xing began to calculate subconsciously.

However, just when Guo Xing had an idea, he saw Wang Donglai also starting to write.

The tip of the pen scratched across the paper, making a friction sound.

To the ears of people like Guo Xing who like to learn, it is extremely pleasant.

Guo Xing, who originally only wanted to take a look, was fascinated by Wang Donglai's extremely smooth answer.

It wasn't until Wang Donglai completely answered this question that Guo Xing came to his senses.

"Wang Donglai, you can solve this problem, so shouldn't you have gotten that score in the last math test?"

After reacting, Guo Xing became more and more confused.

Because this question is not simple, it can even be said that it will take a certain amount of time for Guo Xing to answer it.

But in Wang Donglai's hands, the answer came out in just a moment.

Although this does not mean that Wang Donglai's mathematics level is better than Guo Xing's, it can also prove that Wang Donglai's mathematics level is definitely not the last.

When Guo Xing first entered the classroom, Wang Donglai noticed it.

However, he was not distracted while he was thinking.

At this moment, after hearing Guo Xing's question, he said: "My math level was just like that last time. I was able to answer this question so quickly thanks to your notes. It was really effective."

With that said, Wang Donglai took out a note from the table and handed it to Guo Xing.

Wang Donglai read this notebook for fourteen hours.

After reading it over and over again three times, the experience gained exceeded Wang Donglai's expectations.

[Host: Wang Donglai]

[Attributes: Physique 8, Wisdom 7]

[Level: Level 98 (2000/)]

[Reading Type: Required for High School]

[Skill: None]

[Ability: Sense of Direction]

Chinese: lv4 (85/2000)

Geography: lv4 (1/2000)

Politics: lv4 (1/1000)

History: lv4 (1/1000)

English: lv3 (198/1000)

Mathematics: lv3 (2/2000)

Chemistry: lv1 (164/1000)

Physics: lv1 (184/1000)

Creature: lv1 (124/1000)

Mathematics, which originally took 23 hours to upgrade, was upgraded the next day.

This happens also because of another rule of the reading system.

That is, the mathematical notebook is the essence of recording, and the experience value can be increased quickly. In addition, Wang Donglai is in a state of deep learning, and the speed of obtaining experience points has soared.

In one night, I improved my math level by one level.

Just level one allowed Wang Donglai to quickly solve this math problem.

Taking the mathematics notes Wang Donglai returned to him, Guo Xing frowned, a little surprised and a little confused.

Could it be that my math notes really have such a powerful effect?

The more he thought about it, the more curious Guo Xing became.

"Wang Donglai, can I ask you a question?" Guo Xing asked in a low voice.

After glancing at Guo Xing, Wang Donglai seemed to have guessed something and shook his head, "No, I want to study!" After saying that, Wang Donglai immersed himself in studying again.

When he heard Wang Donglai's refusal without hesitation, Guo Xing snorted softly, stopped talking, and sat down in his seat to start studying.

After morning reading begins.

As the Chinese teacher and head teacher of Class 14, Meng Fang came to the classroom on time.

I walked off the podium and walked twice in the aisle.

Meng Fang noticed Wang Donglai's strange behavior and did not recite aloud or take out the Chinese language book.

Instead, he leaned on the table and wrote and drew, as if he was doing a problem solving.

Curious, I walked over and saw Wang Donglai doing math problems.

His face fell, and he reached out and patted Wang Donglai's table, motioning for Wang Donglai to follow him.

corridor.

Meng Fang had a cold face, folded her arms, looked at Wang Donglai seriously, and asked: "Wang Donglai, what do you think of your results?"

After shaking his head, Wang Donglai said aloud: "My grades are not good, so I am considered a poor student."

"I won't hide your grades from you. According to my experience over the years, if you can't get enough, you will be in the top three universities. You won't even be able to get into the top three universities with higher scores."

"Those are the three majors in the province. City College, Mingde College, etc. I guess you don't need to think about it. Foreign Affairs, Eurasia, and Translation are also a bit difficult. I guess only the Fashion Institute of Technology can admit you."

"I have said a lot of truth, and I don't want to say more. It's just that I see that you have been very serious about your studies recently. I think you can still be saved. You are a good student and your grades can still improve. That's why I called you come out."

"The review for the third year of high school is planned by the school. I know that your math scores are not good, and you want to improve your math scores, but there is something wrong with your method. You should memorize ancient poems when you read Chinese in the early morning. You didn't even learn Chinese in the last exam. They all failed, do you think this is appropriate?"

"Guo Xing is good at math, and he happens to be your deskmate again. If you have any questions that you don't know, you can ask Guo Xing. If you still can't, you can come to the office and ask Teacher Luo. Don't look at the teacher who is usually a bit fierce, but it's all for your benefit. Your grades are good, so the teacher still welcomes you to ask questions."

As the head teacher, Meng Fang started to talk a lot and explained the truth to Wang Donglai.

Wang Donglai could also tell that Meng Fang's words were not all empty talk, but that he was sincere and concerned about his own performance.

Feeling warm in my heart, I said, "Teacher Meng, I know you are doing it for my own good and care about my grades."

"However, I also have my review plan. I can assure you that my score will be higher in the next exam than this time. If I fail to do it, I promise I will not do it again. What do you think, Teacher Meng?" Sample?"

Originally Wang Donglai was not prepared to explain, but after feeling Meng Fang's concern, he explained a little and made a guarantee.

Frowning her eyebrows, Meng Fang said nothing and waved her hand to let Wang Donglai return to the classroom.

After Wang Donglai sat down, a note was passed over.

"Why is the boss calling you?"

The note was passed by Guo Xing.

"I didn't do anything. I just criticized me for not reading Chinese books when I read Chinese earlier. I read math books instead."

Wang Donglai didn't hide it and explained it to Guo Xing.

"You spend all your time on mathematics, which is a bit too extreme. If there is something you don't know, and you don't mind it, just ask me and I will try my best to answer you. You should follow the teacher's arrangements and keep up with the review pace. Better."

After a while, Guo Xing handed over a note again with a long paragraph written on it.

Seeing Juanxiu's handwriting on the note, Wang Donglai turned his head and looked at Guo Xing seriously and said, "Thank you!"

At the same time, Wang Donglai took a serious look at Guo Xing.

He has a round face, not too big, with big and lively eyes under double eyelids, and fair and smooth skin.

Full of collagen, full of youthful vitality.

Wang Donglai's heart skipped a beat, and his eighteen-year-old body suddenly had a reaction.

The only people who can restrain evil thoughts are sage time or a weak body. Obviously Wang Donglai is not one of them at this time.

"Why didn't you notice before that Guo Xing looks pretty good..."

When this thought came to his mind, Wang Donglai suddenly woke up.

"I don't even care about falling in love, I just want to study!"

After reciting it silently twice, Wang Donglai withdrew his gaze, took out his Chinese book from the table, and began to recite ancient poems.

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(End of this chapter)