This Question Has Been Taught 12 Times Chapter 10

Loop4 (10)

By the time Bai Tong found the opportunity again, he was already very close to the “end point” mentioned by Sun Daining.During this period, they were in contact through mobile phones. As far as she knew, Sun Daining had found various ways to understand this problem and had made some progress, but the specifics still depended on whether he could solve it today.

Bai Tong came to Sun Daining’s house. As soon as he saw Sun Daining, he felt that something was wrong, because Sun Daining had the same expression as that cat and cat bug, “I will never laugh again.”

“The teacher will teach you this question tomorrow. What should I do? I’m so scared.” Sun Daining said.

“I was so nervous that I forgot everything. Today I found that I couldn’t even get any guidance from my first question.”

Bai Tong: “…”

Belike, kid, are you kidding me?

“What are you afraid of?” Bai Tong asked.

“I have experienced such boring and painful four months so many times. I really want to vomit. Of course, it’s good to be with you this time. I mean, it was really painful before. But if I go back to the starting point, you probably won’t remember me. Alas, I might as well accept this cruel fate and stop struggling pointlessly!”

Bai Tong: “…”

It felt like Sun Daining started talking nonsense when she got nervous.

“You will never forget what you have learned, just like riding a bicycle or swimming. If you think about it calmly, you will be able to do it.” Bai Tong adopted a positive psychological suggestion.

But Sun Daining said, “What if I never really learned it.”

Logically speaking, Bai Tong’s patience with idiots is 1, and 1 means it will be exhausted in one second.

But it was completely different for Sun Daining. Bai Tong took out the scratch paper and said, “It doesn’t matter, let’s review it from the beginning.”

The first small question is to find the derivative and find the minimum value of a, and get a >= -2

The second question is to verify that the function is a centrally symmetric graph. First, you must know the conditions that need to be met for the central symmetry of the function: if f(x) is centrally symmetric about (a,b), then f(a+x)+f(a-x)=2b.From the domain of definition, it can be seen that the original function is symmetric about the (1,0) point, and is brought into the function to obtain f(x) + f(2-x) = 2a, then the function is symmetric about the center of (1,a).

The third question is, first of all, a = -2, which has been proved before.Then f(x) = ln[x/(2-x)]–2x+b(x-1)^3, and the derivative is f'(x) = (x-1)^2(-3bx^2+6bx+2)/x(2-x). Next, analyze the positive and negative situations of the derivative.

How to analyze it? Sun Daining was stuck at this step and couldn’t move.

Sun Daining even understood the second question that Bai Tong had not mentioned before. But for the third question, even if he was forced to accept a=-2 with half-knowledge, he could only go as far as seeking the derivation, which was the limit.

Her expression was like: It’s that fish!Jumping from the pot to the ground, it has clearly exceeded its limit.Now, it is long dead, but there is still a strange light in its eyes.

Bai Tong looked at Sun Daining and turned the pen in his hand.

Something rang outside, and Sun Daining came back to his senses, feeling relieved as if he had given up, and said, “That’s it, rest for a while.”

Sun Daining asked Bai Tong to wait for her in the room for a while. Not long after, she came back with a cup of yogurt from outside.

“This is the last time, let’s try to see if it tastes good.” Sun Daining said.

This is a flat-bottomed crystal glass cup with a broken light. The indoor light reflects a circle of fine light spots from the cup body. The inside of the cup is milky white and supports a layer of dark purple liquid. From the place where the two colors blend, translucent ice cubes collide with each other.

It’s pretty, a bit like wine, but with a spoon.

Bai Tong asked, “Do you want to drink it directly? You still need to stir it.”

I admit that I am very ignorant, I have never seen such a drink at home or in a restaurant before.

“Anything is fine.” Sun Daining explained, “Purple is grape juice.”

Bai Tong smelled it again. It smelled a bit strange.

He picked up the small spoon next to him, took a spoonful and put it into his mouth. The taste was weirder than the smell, a bit…disgusting.

Bai Tong swallowed it anyway and said, “It tastes very strange.”

“…Maybe it’s because I added brandy.” Sun Daining said.

…It’s really wine.

Seeing Bai Tong put down the spoon, Sun Daining asked, “Aren’t you going to drink?”

Sun Daining seemed full of expectation, and Bai Tong picked up the cup again.

Maybe I drank too little just now and didn’t taste it. If I take a big sip, it might taste better.

His lips were already pressed against the rim of the cup. Whether it was because of the smell or because his throat was uncomfortable, Bai Tong coughed violently, almost crying.

After calming down, he said, “Sorry.”

Even if it was done by my girlfriend, it wouldn’t work. She couldn’t drink it and didn’t want to drink it.

But at this time, she saw Sun Daining crying.

Not knowing where the inspiration came from, Bai Tong subconsciously asked, “Why did you poison me?”

Wow, what a big surprise.

Sun Daining seemed to acquiesce.

Because she just shed tears and didn’t say a word to refute.

No wonder Bai Jingru said “it’s dangerous outside”. Bai Tong knew that she wasn’t referring to the danger overseas, but that the whole world was dangerous.

“You should have said it earlier,” Bai Tong said to Sun Daining, not even wanting to care about the possibility of being monitored, “Just give me the medicine.”

Not to mention that this was within the cycle, even outside the cycle, Bai Tong suspected that he might be willing to do this.

“No more, used up.” Sun Daining wiped away her tears, took out the package from the drawer and gave it to Bai Tong.

The fluorescent orange packaging made Bai Tong’s eyes brighten, but the three large characters printed on it made Bai Tong’s eyes darken.

——“□□”.

It really pushed the boundaries of cognition. She wanted to kill herself with such disgusting poison.

As if he knew what Bai Tong was thinking, Sun Daining said, “I can only buy this. Forget it, I’m sorry.”

Bai Tong didn’t want to let it go. Since this was Sun Daining’s solution, Bai Tong took the still full cup.

She didn’t drink much when she was stopped by Sun Daining. During the tug, the liquid in the cup spilled out and splashed on both of them.

Sun Daining grabbed the empty cup and put it down, then took Bai Tong to the bathroom to rinse it.

Hearing that vomiting cannot be induced in this situation, Sun Daining said to Bai Tong, “Let’s go to the hospital.”

“Tomorrow is the last day, what else is there to do?” Bai Tong said.

It was because it was the last day and he felt that Bai Tong could be regarded as someone who did not really exist that Sun Daining thought that he could do such a thing.But when she actually did it, the unavoidable true feelings in her heart loudly announced every second how serious a crime she was committing.Perhaps it is because of such extremely evil thoughts that he will stay in this hell forever.But in the beginning, when she knew nothing about the cycle, what original sin had led her to fall here?

When people are about to go crazy, they tend to approach theology. Sun Daining really felt like she was going crazy.

After rinsing, Sun Daining found a new top and similar pants for Bai Tong to put on.

Bai Tong has not had any abnormal reaction until now. She doubts whether Sun Daining bought counterfeit medicine, and she is still struggling, “There are so many poisons in the world, but you chose such a disgusting one for me. In your mind, I am worthy of sharing a pot with mice?”

“…You can only buy this one, and it’s hard to buy this one.” He didn’t understand what Bai Tong was struggling with.

They changed their clothes and sat and waited for a while. Bai Tong was still safe after all.

Bai Tong could feel that no matter who stayed in this world, they would only face endless torture.

She comforted Sun Daining, “Okay, don’t be discouraged. Next time you use a dagger, I can accept your use of a dagger.” As if she was joking, she added, “Don’t use fruit knives or kitchen knives.”

Sun Daining didn’t find it funny, “Who has a dagger?”

“I have it at home. I’ll give it to you next time.” Bai Tong said.

“You’ve made it clear that you think I can’t crack it,” Sun Daining was really worried, “I’m planning to memorize the answer and write it down to try.”

“Okay, maybe you can crack it this time.” Bai Tong hugged Sun Daining and said, “Then we’ll see you outside the loop.”

“But, what if you don’t remember me outside the loop?” Sun Daining finished worrying about this and then started to worry about that.

“Then do you want to get out of the cycle, or do you want me to remember you?” Bai Tong asked Sun Daining.

“The answer is that I can’t escape the cycle, and you won’t remember me.” Sun Daining’s confidence was 0.

Sun Daining said such unlucky and realistic words lightly, which made Bai Tong laugh for a long time and said, “The answer is that you can get out of the cycle, and I will remember you, and I will always like you.”

“Outside of the cycle, come find me again.” Bai Tong kissed Sun Daining’s cheek.

He put on his coat to cover up his changed inner clothes, said goodbye to Sun Daining and went home alone.