Since it is a question of derivation, then ...... Do you have to find the original function by inversely deriving it first?

……

Thinking like this, Gu Yu began to try to find the original function in the problem first. Pen? Interesting? Pavilion wWw. ｂiquge。 ｉｎfo

This is undoubtedly reasonable, after all, as far as high school guidance questions are concerned, whether it is a fill-in-the-blank question or a question and answer question, most of them are basically considered backwards first, and from the perspective of practicality, the so-called big questions only need to complete this step...... It's all scored. However, there will be exceptions......

Gu Yu began to use the most ordinary and effective means to solve the problem, while thinking about some other nutritious problems.

In the most primitive way, not to mention whether or not the answer can be solved smoothly, the first time spent is very large, and the possibility of errors in the process of inverting the equation with square roots should not be underestimated. It's just a fill-in-the-blank question with a modest score, but is it really a question that takes so much time to solve?

No, if, as the teacher said, the intention of the questioner would not be to delay the respondent's time in such an inconsequential place, then ...... There must be a real way to solve the problem, what is it?

Thinking like this, Gu Yu stopped the movement of his hand, and the pen that had already filled half a page of scratch paper was also accompanied by Gu Yu's stopped hand hanging in the air only one centimeter away from the scratch paper.

How to solve the problem as a shortcut......

Gu Yu, who came to the conclusion of nutrition through the process of nutritious thinking, started to think about nutrition again.

Judging from this aspect alone, Gu Yu undoubtedly threw off dozens of streets of the ancient style, of course...... The aspect referred to here does not simply refer to academic performance, but to the attitude towards learning.

How Gu Feng learned, this is really no one knows, after all, no one has ever seen this guy study, objectively speaking, in fact, this thing has never done anything serious in school, at least in the classroom is asleep. The earnest teaching of the people's teachers, this guy will definitely not be interested, and he will not play cards according to the routine of the exam.

For example, respected teachers often teach diligent students to learn to guess the thoughts of the questioners......

Well...... This is undoubtedly practical, take Gu Yu, who is a model student, as an example, she eliminated the brainless problem-solving method she originally intended to use through this way of thinking, which effectively saved time and exercised her mind, although it is still a little far from solving the problem, but it is already commendable. Leaving aside the question of whether the brainless method of solving the problem can successfully solve the correct answer, it is also valuable to be able to realize that this kind of question cannot be wasted on the exam.

As for the same case, well...... Excluding the fact that the guy could think of the right answer at once, if the guy were to guess the wishes of the questioner, he would come up with an answer that would be like this: "Those old men want me to die......"

Well...... After all, he is a guy who only plays a side effect on society most of the time, and it is better not to have too high expectations for him.

However, this guy who seems to have never studied has a high academic performance in the third year of high school, although it is unwilling, but it is also a fact that he does not earn.

Well, in fact, that kind of thing is good, and the focus now is that Gu Yu has encountered problems in his studies, and he is in a state of great trouble.

I saw her frowning and meditating, and a long time had passed when the topic had been brought to another place.

…… Where is the breaking point?

Hawkers,It's very reasonable.,Learning this kind of thing.,It's not something that can be solved just by thinking.,Otherwise, the existence of people's teachers will become a little cheaper.,"If you don't know, just ask the teacher" This kind of golden sentence will not be a golden sentence.

Completely clueless......

Gu Yuru's fingers tapped the pen barrel rhythmically, and some students would turn the pen or bite the pen when thinking about the problem, but it is not excluded that there are guys who have turned this behavior into a habit, in short, in most cases, biting the pen tip does not have the effect of allowing human beings to open up the second pulse of Ren Du, the inspiration, the wisdom in a hurry, and the dog jumping over the wall and breaking out of the small universe by the way.

Even if the object is Gu Yu, he thought about it for a long time.

…… Why don't you ask your teacher for advice?

No, this morning is not the time for the math teacher to be on duty, so the math teacher is not in the teacher's room, Xiao Yao also said just now.

So...... Do you want to put it down and ask when the math teacher comes to the teacher's office in the afternoon?

As soon as this idea came up, it was vetoed by Gu Yu himself.

It's never right to give up lightly, so it's not appropriate to just stop, so let's try harder.

Gu Yu, who had made up his mind in this way, began to calculate on the scratch paper again, and seemed to be planning to use the "stupidest" method to solve the problem first, probably because he wanted to exercise his calculation ability by the way, anyway, he would not suffer if he miscalculated now.

Just after the nerves in his mind relaxed, Gu Yu finally noticed that there seemed to be a different kind of aura beside him.

Gu Yu turned his head a little strangely, looked at his side, and then ......

appears in view.

It is the face of the man who is close at hand.

Gu Yu didn't show surprise at what he saw, and he didn't know if Gu Yu's courage was greater than average, or if the man's appearance itself had the characteristics of reassuring.

Just unconsciously stunned, even at such a close distance, it was almost impossible to find a flawed face, Gu Yu couldn't help but think so.

The angular face, like a carefully carved facial features, is upright and just right, resolute but soft, sunny but not dominant, it is the appearance of a man who is almost perfect in the Asian sense.

It can be said that as long as it is a normal human woman, she will not feel a sense of rejection towards the owner of this face, including Gu Yu.

Ying Luoxin noticed that Gu Yu had finally stopped his thankless calculations, in fact, even if Gu Yu hadn't stopped, he already had the intention of speaking out to stop it.

Ying Luoxin turned his head sideways and met Gu Yu's line of sight, which also meant that the two were facing each other very closely.

(tsk-)

Gu Yu's face turned red as soon as he brushed it, and pushed the chair back for a distance of more than ten centimeters, because he was too anxious and didn't grasp his balance, he fell off the chair.

"Be careful."

Fortunately, Ying Luoxin, a young man, was quick-eyed, and grabbed Gu Yu's wrist while whispering.

Gently pulled Gu Yu's slightly inclined body back, and after Gu Yu sat down again, he did not miss the softness of his hand, but withdrew his hand without losing etiquette and leaving a trace, and asked softly:

"I'm so sorry, are you alright?"

"No...... I'm the one who should say I'm sorry, I'm making too much of a fuss, I'm sorry. ”

Gu Yu's answer was naturally impeccable, and she continued to lower her voice and asked, "May I ask you what's the matter?" Suddenly......"

Although it was still class time at this time, most of the students were still in their own "battle", and they had no time to take care of him, and the voices of Ying Luoxin and Gu Yu's conversation were indeed low enough, so it seemed that no cute classmates noticed that there was anything wrong here, even if they were near the two of them (to put it mildly, people who were addicted to playing with mobile phones would not notice either).

Looking at Gu Yu's cute face that had not yet faded and his right hand still holding a black signature pen, Ying Luoxin smiled softly, and then gestured to the workbook on Gu Yu's desk.

"That."

"Huh?"

Gu Yu replied inexplicably, then moved his chair back to the table, and looked at Ying Luoxin curiously, "What's wrong?" ”

Don't get it? That's pretty obvious, right......

"No, I mean...... I know that, that's the question. Ying Luoxin's expression remained unchanged to Gu Yu's seemingly unpleasant reaction, or rather, the smile was even more authentic.

"Huh? Are you sure? Unlike Ying Luoxin, Gu Yu's reaction was a little excited, but it was not to the point of elation, but his voice seemed to be a few tenths of a decibel higher with his emotions.

"Could you please tell me right away?"

As he spoke, Gu Yu stuffed the signature pen in his hand into Ying Luoxin's hand, and pressed it by the way, letting Ying Luoxin hold the pen, and then looked at Ying Luoxin expectantly, his clear eyes blinking.

Although it was still a polite question in his mouth, judging from his actions, Gu Yu seemed to have ruled out the option of "refusal" by Ying Luoxin.

"Uh......"

Looking at the girl in front of him who was also looking at him, Ying Luoxin couldn't help but laugh a little (well, anyway, he didn't have a bitter expression, it's not bad). It's kind of cute, isn't it? After hearing that she could solve the problem, this girl didn't even think it was polite no matter how she looked at it, and she didn't seem to care for a moment.

"Good good ......"

Coping with the response, Yingluo went to Gu Yu...... 's table leaned closer, and then pointed to the question that bothered Gu Yu with a pen that still retained Gu Yu's body temperature.

"In fact, as far as the knowledge you can master in high school, there is no way to calculate the normal answer by ordinary means."

Gu Yu listened carefully, nodded his head slightly, and motioned for Ying Luoxin to continue, not knowing if he didn't care about the suspicious part of Ying Luoxin's mouth, "You are in high school", or didn't notice it at all.

Moved the pen to the blank space calculated on Gu Yu's scratch paper, and wrote down the formula in the question.

"Although it is true that this is a problem related to derivation, it is not calculated by derivative formulas, which is not the intention of the questioner, and the problem can only be considered by the 'area' they represent."

"Hmm...... So? ”

Of course, Gu Yu also thought of the idea of the questioner, but what should be done next is the question, she responded to Ying Luoxin as if urging.

"At this time, it is necessary to square both sides of the formula at the same time, remove the root number, and at the same time represent the left half of the formula with y, and then deform the formula by moving the 'term' in the formula to obtain the standard equation of the circle."

Ying Luoxin wrote a new formula under the formula, "In this way, the problem of derivation becomes initially the problem of finding the area of a circle." ”

Gu Yu looked at the formula he had written, and suddenly had a feeling of enlightenment, but Ying Luoxin continued, "Although it seems that the problem has been simplified here, it is the part that is most likely to make mistakes later. ”

Ying Luoxin drew two vertically intersecting lines on the scratch paper, marked the x and y to indicate the coordinate system, and then drew a fairly standard circle in the coordinate system with the origin as the center of the circle with her bare hands, and dotted the dot with the tip of the pen.

"This is a circle with a radius of two, and most of the people who do it here will ignore some very important things because of the momentary joy and make themselves fall short."

When he heard this, Gu Yu swallowed his unwarranted saliva with a little empathy.

Yes...... Yes, most students have had the experience of stumbling over a simple and exaggerated place because they solved a difficult factor. Alas...... It's an experience I can't remember.

"Many people fill in the area of the circle as the answer, but ...... Considering the derivative, and the domain of the equation itself, in fact, the problem only requires the area of a quarter circle. As he spoke, Ying Luoxin crossed out the negative half axis of the y-axis and the negative half-axis of the x-axis of the circle, and gently tapped the remaining fan shape with a signature pen.

That's the part, so that's the answer...... It's 3.14. ”

After explaining, Ying Luoxin put down the pen and turned his head to look at Gu Yu with a "so it is" expression.

"Thank you, I really don't know what I would have done if it weren't for you." Gu Yu thanked him sincerely.

In this regard, Ying Luoxin waved his hand as if he didn't care, and replied kindly, "It's my honor to be able to help you......"

At this point, Ying Luoxin suddenly paused as if thinking about something, "No, then again, I think even if I don't say it, you will be able to find the problem quickly, or it can be said that the act of telling you the answer itself will do you more harm than good." So...... I should apologize to you. ”

"Hmm...... You should think too highly of me, my math grades are pretty bad. He said something that was probably humble, and it could be regarded as a word that was in line with Gu Yu's style.

"Speaking of which...... Who are you? ”

Well...... didn't remember the name of the neighboring classmate who didn't have a strong sense of presence, which was still reasonable for Gu Yu, who was diligent in studying. But......

I didn't remember the name of a handsome guy who had just introduced himself on the podium not long ago and was sitting next to him...... No, should I say that it didn't hear it at all?

As a normal girl, that's a bit unreasonable, right?

Gu Yu's sudden question was obviously unexpected by Ying Luoxin, but he was probably not an ordinary person, so Ying Luoxin only returned to normal after being stunned for a short time, and replied in a slightly playful tone, "I am a transfer student who officially transferred from the school today, Ying Luoxin, my name is on the blackboard." ”

Looking at the blackboard, after seeing Ying Luoxin's name clearly, Gu Yu looked back at him and tilted his head as if he was surprised by the name.

The same name as the novel......

It should have guessed what Gu Yu was thinking, Ying Luoxin nodded, "This name comes from a novel by Ba Jin, by the way, not only my parents, but I also like that person's novel." ”

"I haven't asked anything."

Gu Yu blinked.

"But you want to ask, right?"

Ying Luoxin still had that kind expression on his face.

Is this a good heart, or is he good at reading words and feelings?

Gu Yu did not respond to his question, but this was undoubtedly a tacit acquiescence.

"That's true, but...... It always feels weird. ”

Ying Luoxin put Gu Yu's signature pen back into Gu Yu's hand, and followed Gu Yu's movements to close her hand, chuckling.

"Don't worry about the details."

Gu Yu looked at Ying Luoxin blankly, not knowing what she was thinking, she seemed to have heard this sentence from another boy more than once.