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.
In 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 question, so shouldn't you get that score in the last math test?"
After realizing it, 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 to answer it for Guo Xing.
The result was in Wang Donglai's hands, and he answered it 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.
Wang Donglai noticed Guo Xing as soon as he entered the classroom.
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.
I watched it over and over again three times, and the experience gained exceeded Wang Donglai’s expectations.
[Host: Wang Donglai]
[Attributes: Physique 8, Wisdom 7]
[Level: Level 1 (98/2000)]
[Reading Type: Required for High School]
[Skills: 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)
Biology: lv1 (124/1000)
Mathematics, which originally took 23 hours to upgrade, was upgraded the next day.
The reason why this happens is 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 value 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.
Looking at Guo Xing, Wang Donglai seemed to have guessed something, and shook his head directly, "No, I want to study!" After saying that, Wang Donglai immersed himself in studying again.
When Wang Donglai refused 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 something strange about Wang Donglai and did not recite aloud or take out the Chinese language book.
Instead, I was lying on the table writing and drawing, as if doing a problem.
I was curious, so I walked over and saw Wang Donglai doing math problems.
His face fell, and he reached out and patted Wang Donglai's table, signaling Wang Donglai to follow him.
Corridor.
Meng Fang had a cold face, crossed her arms, looked at Wang Donglai seriously, and asked: "Wang Donglai, what do you think of your grades?"
Shaking his head, Wang Donglai came out. He said in a loud voice: "My grades are not good. He’s 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 won’t be able to get into a third-tier college, or even a third-tier college with a higher score. Go.”
"Those are the three majors in the province, City College, Mingde College, etc. You don't need to think about it. Foreign Affairs, Eurasia, and Translation are also a bit difficult. I guess only the Fashion College and the like can admit you."
"I have said a lot of truth, and I don't want to say more. It's just that It’s because of your serious study attitude recently. I think you can still be saved. You are a good student and your grades can still improve, so I will call you out.”
“The school is reviewing for the senior year. It's planned. I know 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 early. You didn’t even pass Chinese in the last exam. Do you think this is appropriate?”
“Guo Xing is good at math?” , happens to be your deskmate again. If you have any questions you don’t know, you can ask Guo Xing. If you can’t, you can You can also come to the office and ask Teacher Luo. Although the teacher is usually a bit fierce, but it is all for your good grades, so the teacher still welcomes you to ask questions. "
As the class teacher, Meng Fang said it as soon as she opened her mouth. After a long discussion, Wang Donglai was given some reasoning.
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.
My heart warmed, and 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 next time I take the exam, my score will be better than this one. Even higher. If I don’t do it, I promise I won’t do it again. What do you think, Teacher Meng?”
Originally, Wang Donglai was not prepared to explain, but after feeling Meng Fang’s concern, After that, I explained it a little bit and made a guarantee.
Frowning her eyebrows, Meng Fang said nothing, waved her hand and let Wang Donglai return to the classroom.
After Wang Donglai sat down, a note was passed over.
"Why is the old class calling you?"
The note was passed by Guo Xing.
"I didn't do anything. I just criticized me for not reading the Chinese book early in reading Chinese, but reading the math book."
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 piece of paper again with a long paragraph written on it.
Seeing the beautiful 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.
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.
"How come I didn't notice before, Guo Xing looks pretty good..."
When this thought came to his mind, Wang Donglai suddenly woke up.
"I don't even talk about love, I just want to learn!"
After reciting it silently twice, Wang Donglai withdrew his gaze, took out the Chinese book from the table, and began to recite ancient poems.
Please recommend...
(End of this chapter)