How to break into a math book

Tu Hua didn't sleep well all night.He still couldn't figure out where his answer was wrong.He called Wang Boyu several times but no one answered, so Sun Wei, Wang Boyu and Tang Bo should not be eliminated yet.

Early the next morning, Tu Hua went out to school.On the way, he called Wang Boyu again, but there was still no answer.

This is a bit strange.Logically speaking, the time in the game is relative to that in real life. Tu Hua has gone through so many levels in the game, and when he returned to reality, it only took more than ten minutes.So even if Wang Boyu came to the end, he should have returned to reality long ago.

Tu Hua came to the school full of doubts, and planned to go to the next class to find Sun Wei to see the situation.Before the morning reading started, there were only a dozen people in Sun Wei's class. Tu Hua said to the boy sitting at the door: "When Sun Wei comes, please tell her that I will wait for her at the basketball court."

The boy was sorting out the books in the drawer, when he heard this he gave him a strange look: "Sun Wei? Who is Sun Wei?"

After Sun Wei, a sophomore in high school, made fun of him every time he saw Tu Hua, he didn't expect that after so long, he still couldn't forget this joke.Tu Hua glanced at him speechlessly: "We're going to talk about business, don't interrupt."

The boy looked confused: "But there is no such person as Sun Wei in our class."

The boy's serious expression made Tu Hua feel that the matter seemed to be overwhelmed.There was a chill behind him, and he asked in a daze, "Then tell me...who is the number one in the grade?"

The boy gave him a contemptuous look, and sneered: "Isn't it you! I really don't understand, isn't it just learning, as for showing off everywhere?"

Tu Hua didn't know how he got back to the classroom.Everything around looks normal, but there is a kind of strangeness.

When the morning reading bell rang, the deskmate finally arrived.With bread still in his mouth, Tu Hua grabbed him: "Do you know Sun Wei?"

The deskmate was full of doubts: "Who?"

Tu Hua asked again: "Who is the first in grade?"

The deskmate smiled: "Isn't that you?"

a bolt from the blue.He called Wang Boyu again, but there was still no answer.Tu Hua was stunned for a while, and then called his mother: "Mom, do you remember when I was in junior high school, before we moved, Wang Boyu, the son of Uncle Wang's next door?"

Tu Hua's mother replied strangely: "Are you feeling unwell? Uncle Wang and Aunt Chen have never had children."

"Beep-beep-beep-"

Tu Hua hung up the phone in a daze.His mind went blank, Wang Boyu and Sun Wei disappeared, as if they had never existed.Is my memory wrong, or is there something wrong with the world?Did he accidentally travel to a parallel space when he came back from the game?Or...are they stuck in the game world forever and can't get out?

Tu Hua grabbed the tablemate: "Do you still remember the book "Mathematics Breakthrough" you gave me?"

The deskmate nodded: "Remember, what's wrong?"

"This book can take us to the world of mathematics and break through the barriers." Tu Hua looked at him expectantly, for fear that he would say anything in denial, "You know about this, right?"

The deskmate frowned, and reached out to touch his forehead: "Do you have a fever? How are you talking nonsense? What's the mess, do you want to go to the hospital?"

Tu Hua grabbed his hand and stared at him with burning eyes: "The last question, I'm so bad at math, how did I get the first place in the grade?"

The tablemate had a look of "don't be joking": "Are you still bad in math? Every time you get full marks, is that called bad?"

Tu Hua looked at the students in the classroom bewilderedly, some of them were joking, some were reading, everything was very real, but it couldn't coincide with the reality in his memory.

Could it be that……

Tu Hua tentatively slid his finger in the air, a blue light flashed in front of him, and the system screen popped out.

[Current Level: Function Level]

[Main task: What exactly is the function? 】

[Sub-quests: None]

[Props: Mr. X's favorability +15, a ghost stone]

He's still in the game!And not eliminated!

Tu Hua was overjoyed. Although he didn't think clearly about the purpose of this level to create such an illusion of being eliminated, as long as he can continue the game, he will be able to solve the puzzle and find a way out!

After the joy, the sense of reality when looking at the students around me is much lower.For example, he is at the same table, and he is actually reading English at the moment. The system really doesn't understand it deeply enough. After sitting at the same table with him for a year, this kid hates English the most. How can he consciously recite words?

Tu Hua smiled and patted his deskmate on the shoulder: "It's pretty similar, isn't it?"

The deskmate looked up at him in astonishment: "I like English the most."

Tu Hua was about to refute, when the girl sitting at the door suddenly called him, "Tu Hua, someone is looking for you!"

Looking along the door of the classroom, I saw a tall and slender man leaning against the wall, looking at him with a smile.

Mr. x!

Tu Hua immediately got up and went out, pulling Mr. X to a corner: "What's going on?"

Mr. X didn't answer him, but handed him the breakfast in his hand: "Wake up so early and come to school, have you forgotten to eat breakfast?"

In his knuckle-knuckle hand was carrying a bag of steaming steamed buns, which still exuded a fragrance.Tu Hua didn't take it, but looked at him strangely: "Why did you bring me breakfast?"

Mr. X stroked his hair, as if smoothing the fur of a dog: "It's only natural to bring food to my wife."

"Wife?!" Tu Hua took a step back, looked at Mr. X's handsome face in shock, and suddenly thought of the scene in the tribe's bridal chamber, his face instantly turned red to the neck, "What nonsense are you talking about! Not now Have you changed the scene yet?"

"Marriage is a big deal, how can you say it's over?" Mr. X slowly approached, pushed him against the corner of the wall, and said in a low voice, "Did you forget that you are already married to me."

Tu Hua's head was about to explode, he pushed him away and rushed into the classroom.

What the hell kind of plot is this?Why did you send such a handsome NPC to torture him!And this guy's logic obviously has problems. Even if the effect of that absurd wedding continues, it is Tu Hua who married him. When did Tu Hua become his wife?

Mr. X behind him seemed to be smiling, and Tu Hua heard his reminding voice: "I will pick you up after school tonight, you only have 10 hours left."

Back in the classroom, Tu Hua's deskmate looked at the breakfast in his hand with envious eyes: "Tu Hua, your husband treats you so well!"

Tu Hua almost vomited blood: "Can you NPCs stop being so dedicated!"

The tablemate shrugged innocently and continued to read English.

This weird scene, coupled with Mr. X's ambiguous attitude, made Tu Hua's mind in a mess, and he spent the whole morning in a daze.The teachers came to class on time as in real life, but the content of the lectures was messed up. After listening to a few words, Tu Hua didn't want to listen. The system is too sloppy, and the content of the lectures is obviously wrong.

He lay down on the table, trying hard to throw out the messy thoughts in his mind, took a pen to write and draw on the notebook.

He listed all the doubts in this level.

The first is to judge the answer of that function. The result he gave was an exponential function. Mr. X had a hesitant expression at that time. After he confirmed it, he was sent to the current scene.He wasn't eliminated, but he wasn't in the original mission level either.So is his answer right or wrong?

Tu Hua thought about it carefully, and there must be some problems with the term "exponential function".If it was the correct answer, he should have cleared the level by now, but obviously he was still stuck in the function level and lost contact with his teammates.

But what is wrong with this answer?I don't have any ideas right now.Tu Hua put a cross behind the first point listed.

Next is the second point, what Mr. X said to him at the door of the classroom.Although facing a handsome guy of Mr. X's level, Tu Hua's head often short-circuited, but the last sentence was deeply burned into his mind.

"You only have 10 hours left."

Mr. X will not say such a sentence for no reason, this must be a reminder related to the task.According to the literal meaning, there are only 10 hours left for Tuhua to clear the customs.But when he first entered the main mission of the function, he remembered clearly that the rules said that this mission was not limited in time. Why did he give a time limit now?

Does the fact that the scene is different mean that he started a different mission?Tu Hua called up the system panel in a daze, and carefully checked his status bar.

[Props: Mr. X's favorability +15, a ghost stone]

Wait...the ghost stone?Hadn't the Nether Stone been handed over to the old chief?

Tu Hua reached out and clicked on the icon of the ghost stone, ready to take the ghost stone out of the system backpack.But the system suddenly popped up a prompt: [Are you sure to use the ghost stone to resurrect to answer the question? 】

resurrection? !Tu Hua's eyes widened, and he finally figured out the connection between all kinds of weirdness.

This ghost stone is probably the most awesome item in the game.Perhaps the ghost stone was created for this main quest. When entering the tribal mission, the ghost stone became a prop to introduce the challenger to the chief. If Tu Hua answered the question correctly at that time, the ghost stone played its role, and when Tu Hua When the answer is wrong, Mingshi will automatically activate its second prop skill.

resurrection.

So this unremarkable stone is even more effective than Sun Wei's reminder calculator, and he gave Tu Hua another chance.

Tu Hua's heart was beating fast, he put the ghost stone back into his backpack, put away the system panel, and forced himself to calm down.He had to wait until the last moment to use the ghost stone to answer the question. From this point of view, his "exponential function" answer was wrong. He had to find the correct answer within 10 hours, and then use the resurrection opportunity given by the ghost stone to pass the level.

So what is the answer...

"Tu Hua! Stand up and answer this question!" The math teacher on the podium suddenly called Tu Hua's name with an uneasy expression, as if he had noticed that he was wandering.

Although it is in the game, the scene is real enough. Tu Hua, who has never been criticized by the teacher before, is still a little nervous when facing the sudden attack of the math teacher.He scratched his head in embarrassment, stood up and looked at the topic on the blackboard.

This is a question about judging the function type based on the function image. The image is very simple. Although Tuhua has always failed in mathematics, it can be seen what this gentle arc is.

"Choose C, exponential function."

The math teacher's face darkened suddenly: "You did something wrong again with such a simple question! Tu Hua, you have become less and less serious about studying recently. Even if you can get full marks in math, it doesn't mean you can do everything!"

Holding the chalk in his hand, the teacher tapped vigorously on the blackboard: "Remember clearly, this is not an exponential function, but a logarithmic function! Sit down!"

Tu Hua looked at the arc that was monotonically increasing in the first and second quadrants, and thought to himself that everything in the game is unreliable. This is obviously an exponential function.The logarithmic function and the exponential function are inverse functions of each other. The image should be monotonically increasing in the first and fourth quadrants, and the exponential function should be symmetrical through the origin...

Sitting on the seat, Tu Hua looked at the math teacher's still unkind expression, and suddenly remembered what he said just now: "You did such a simple question wrong again!"

again!

In this level, this is his second exposure to the graph of the exponential function.So this NPC playing the math teacher is reminding him?

In fact, the answer to this question is not an exponential function, but a logarithmic function that is its inverse function?

The author has something to say: The next chapter reveals the secret! _(:з」∠)_