June is our farewell song

Chapter 130 Don't Talk
"You two, what were you talking about just now?"

It wasn't until the preparatory bell for the first class in the afternoon that Qi Yu slowly walked in from the back door of the classroom. Gu Yuan squinted at her and asked.

"It's nothing to talk about, it's just topics that girls talk about when they are alone."

"Girls' topic?"

"If you want to know that much, turn yourself into a girl."

"No, my surprise does not come from my curiosity about the topic itself, but from my doubts about 'you also know about these topics', in other words, I doubt the major premise of 'girls alone' set up by you. "

"Humph!"

The table of the two shook with a loud noise, and then Gu Yuan's face turned into a dried bitter gourd.

Today is Thursday, and the four classes in the afternoon are all mathematics.

Of course, the original arrangement was to have one physics section and one chemistry section followed by two mathematics sections as a buffer, but because the two teachers went to Nanjing to study at the same time, the Academic Affairs Office had to move all the two mathematics sections tomorrow.Taking math class for three hours a day makes Gu Yuan feel sick when he sees numbers.

"Today we arranged a special lecture to give you a deeper understanding of the zero point and extreme value problems in nested functions. Remember, the problem itself is never the key. Don't memorize the problem, don't copy it mechanically, the idea is the key point. Only when you learn how to analyze Only by learning the conditions of the topic can we not panic every time we see a problem. Just like lighting a fire, only by learning how to choose the right tool under various conditions can we ensure that the fire can be successfully lit most of the time ..."

With the penetrating voice of an old cow echoing in the classroom, Mr. Zou, who was wearing a brown-green jacket, began to write on the blackboard.

Drowsiness flooded Gu Yuan's heart like a tidal wave.

"First, let's review the basics, nested functions. In high school, there are two common types, one, K=F(f(x)), and two, F(f(x))=x .Of course, this is the simplest form. There will be many changes in practical problems. Nested functions. The zero point and extreme value problems can be converted into the most familiar problem of equations with solutions through certain methods. Let's look at a very simple example..."

Gu Yuan rested his chin and stared blankly at the blackboard. Although he liked physics very much and was good at it, it was very difficult to find even a little bit of interest in mathematics.Therefore, his attitude towards mathematics has always been that enough is enough, as long as it can meet his problem-solving needs in physics competitions, it is enough.

But here lies the contradiction. The mathematics required in the physics competition is advanced mathematics that is not difficult, while the requirements for the college entrance examination are elementary and middle mathematics that are extremely difficult. To use an image analogy, it is like letting a person learn various sports. There is a difference between getting started and letting a person master a certain sport to proficiency.It is difficult to judge which is difficult and which is easy, but for Gu Yuan, mastery is undoubtedly much more difficult than extensive research.

"If the function f(x)=x3-3x, set h(x)=f(f(x))-c, c belongs to [-2, 2], find the number of zero points of the function y=h(x). "

Gu Yuan squinted at the example question, and when he saw the closed interval, his first reaction was to discuss by category. Starting from the endpoint can effectively avoid the trap of missing solutions.

It is easy to do the questions usually, but why do I always fall behind when it comes to the exam.

It's like fighting with all kinds of weapons. Although you are very handy in the training ground, you are always in a hurry when you are on the battlefield.

Chen Ge said that it was a mentality problem, but Gu Yuan felt that this problem could be summed up by far more than the word "mentality".

It's like, you have a lot of things you want to say to someone, and you've made a lot of preparations, but when you're on the spot, you realize that you can't say anything.

When people are in math class, their thinking is particularly prone to divergence.

Gu Yuan immediately drew inferences by analogy, and directly took this question out of the exam and put it in his life.

Then I started thinking wildly.

It didn't take long for him to be distracted, but when he came back to his senses, the left one of the two blackboards was already covered with blackboard writing. Gu Yuan looked up and found something that he didn't quite understand, so he habitually He leaned his body to the side and wanted to ask Qi Yu, but what caught his eyes was a pencil drawing with delicate lines.

Qi Yu immediately threw down the pen and covered the painting with both hands, but from the gap between his fingers and the glimpse just now, Gu Yuan could still see who the person in the painting was.

"I said, if you like him, why don't you just agree to him?"

After class, Gu Yuan rested his chin on the window sill and looked at the gray sky outside. It seemed that it was going to rain again. Even winter in the south is not peaceful. If conditions permit, he must move to a place where there is not much rain in winter. city ​​to go.

"Didn't I tell you that the situation is very complicated." Qi Yu said while packing his things, "It's very, very complicated."

"How complicated can it be...Your love and my wish, my husband's love and my concubine's love, two little sweethearts, a match made in heaven." Gu Yuan said one idiom and another gesture, "What a beautiful and pure youthful love, what's so complicated?"

"You still don't admit that you are stupid. If it were as simple as you said, would we be like this?" Qi Yu rolled his eyes at him, "Really, say you are a piece of wood."

"No matter how complicated it is, can it be more complicated than a compound function?" Gu Yuan put his notebook upright in front of his eyes, staring at the lines of polynomials in a daze, "If only these things could be as simple as life. "

"You said it the other way around, it should be, if only life could be as simple as these formulas."

"Eh? Why do you say that?"

"Because math problems are always solvable, and you can always find the so-called standard answer, but there is no such thing as a reference answer in life. What to do, how to live, what is correct and what is incorrect, all depend on it." You can only rely on your own judgment.”

"However, not all mathematical problems are solvable. To give you the simplest example, do you still remember the "Three-Body Problem" I showed you? The Three-Body Problem is a very common problem that has no analytical solution, so we say ..."

Gu Yuan swallowed the last half of the sentence abruptly in the middle of his speech, because he saw that the expression of "you are right" appeared on Qi Yu's face, and if he continued to say If it is over, it is likely to evolve into an expulsion behavior of "get out of the way".

Never try to argue with a girl, because no matter whether you succeed in proving your proposition or not, nothing good will come of it.

This is the most important "theorem" that Gu Yuan has learned in the past few years.

Hearing the sound of Qi Yu's pencil scratching on the paper, Gu Yuan turned his head slightly.

A few strands of hair hang down in front of his forehead, and his pretty lips are pursed. I have to say that this guy is indeed a beautiful girl when she doesn't open her mouth to talk, but it's a pity that she is a man who talks a lot.

"Did you cut this hair yourself?"

"Yes."

Qi Yu didn't lift his head.

"No wonder it's so ugly."

"Bang." Qi Yu slapped the table viciously, and then without hesitation pierced the pencil in Gu Yuan's hand.

"Ah!!!!!!...Ah?"

"Tch, I put away the pen." Qi Yu made a disdainful face at him, "How can I be so vicious? It's like killing a pig, it doesn't hurt that much at all, right?"

"Uh...it really didn't hurt..." Gu Yuan glanced down at the clearly visible small concentric circle marks on his hand, "But it's really too... "

"Too what?" Qi Yu looked over with squinted eyes.

"It's nothing..." Gu Yuan hid his hands silently, "You also had a deskmate in junior high school, did you treat him like this?"

Qi Yu glared at him, did not speak, but directly lowered his head and continued to sort out her notes.

"Huh?" Gu Yuan was puzzled.

"You think everyone is like you." Qi Yu muttered.

"What?" Gu Yuan didn't hear clearly, "What did you say?"

But Qi Yu didn't pay any attention to him anymore, Gu Yuan shrugged his shoulders just to make fun of himself, and turned his head to continue with his physics problem.

The gel pen scratched across the paper and made a rustling sound. After sorting out the notes, Qi Yu turned his head and glanced at him, only to see him biting the index finger of his left hand, holding the pen in his right hand and swiping wantonly in the blank spaces between the topics. Involuntarily grinned slightly.

When this guy is not talking, he is not as annoying as he usually looks.

"Refrain from taking pictures, five yuan per visit, no counter-offering, and support all payment methods."

As soon as the two lips touched, the familiar voice sounded again.

"Ugh--"

Qi Yu let out a long sigh.

Sure enough, as soon as I opened my mouth, there was no more.

(End of this chapter)