Xueba: The Knowledge I Teach, The Crit Is Returned

How many stars is the difficulty of this number sequence question?

For high school science students, it's definitely five stars (out of five).

This kind of series of questions is one of the most difficult types of questions in the college entrance examination paper.

Even for a college student, solving this problem will take some effort.

Even, the vast majority of ordinary undergraduate students will not be able to do this number sequence problem, or they will only do the (1) sub-question.

Because, this kind of question is reserved for those students who are admitted to Qingbei and 211/985 universities, and it is difficult for ordinary students to get full marks.

"Of course." Gu Bai smiled confidently and answered the only audience in the live broadcast room.

Although Gu Bai is not a student of a famous university, but... at the end of the college entrance examination, he specifically inquired about this topic.

So for this topic, he is confident.

Habitually turning the black pen in his hand, Gu Bai wrote on the scratch paper, explaining: "This is a typical number sequence problem."

"From the known conditions given in the title, we can draw two conclusions: ①When n=1, a1=a2, which is consistent with An2; ②Assuming n=k, (k=2), the conclusion is valid, so the Ak2 can be obtained, so when n=k+1...."

"....so when n=k+1, the conclusion An2 still holds. So for all n∈N, An2 holds."

Almost less than a minute.

Gu Bai asked the first question on this topic.

At this time, Gu Bai did not continue to explain in a hurry, but asked the audience in the live broadcast room: "The first question, do you understand?"

"I understand, I understand, the anchor continues!"

Immediately, in Gu Bai's live broadcast room, the ID named "Cat in the Corner" posted a barrage.

"Hmm." Gu Bai hummed and continued.

[.... It can be found that the sequence An is a monotonically decreasing sequence. 】

[...When n=1 is, S1=32+43, when n=2 is, Sn=3+a2+a3+......an3+[2+(14)]+... ..so when a=3 is, Sn2n+4/3]

Gu Bai's speed slowed down for the explanation of the two small questions at the end of this question.

He was afraid that the other party would not understand.

However, Gu Bai once again underestimated the comprehension blessing of systematic teaching by 20%.

Comprehension, also known as comprehension, is one of the most important skills in learning mathematics.

In the classroom, the math teacher explained that some students could understand a topic at one time, while others had to do it several times. The reason for this was the gap in comprehension ability.

Gu Bai does not know how strong an ordinary student can become with the blessing of 20% comprehension.

But... the facts show that Li Sisi can understand the Mathematical Olympiad topics explained by Gu Bai, and the audience in the live broadcast room in front of them can also understand the most difficult sequence module in the college entrance examination.

Of course, Gu Bai knows that there are certain prerequisites, and this prerequisite is that you have a certain foundation.

You can't be a guy who doesn't even know log and cos. You can let him understand trigonometric functions, right?

Isn't this bullshit in broad daylight?

Gu Bai is not a god, he is just a little wall hanging.

"666, 666."

"I didn't expect you to have two brushes, the anchor. I understood it all at once, and it didn't feel very difficult!"

"To know this kind of topic, our math teacher explained it, and it was difficult for me to understand."

Suddenly, 3 barrages passed by.

These 3 bullet screens were all sent by the ID named 'Cat in the Corner'.

Looking at the barrage, Gu Bai smiled.

6 what 6, isn't this a basic operation?

I'm hanging on the wall, follow me, and it's absolutely no problem to get into a famous university.

Of course, he didn't say it.

At the same time, Gu Bai could feel that the audience was probably hooked up with curiosity.

So... first fan, there you go.

as predicted.

Following Gu Bai's live broadcast, the audience with the ID "Cat in the Corner" never left, and she always asked Gu Bai questions.

He (she) obviously became the first loyal fan of Gu Bai's live broadcast room.

...................................................... ....

Fatty Province, Yangcheng No. 1 High School.

"I understand it again, I understand it again."

"This anchor feels amazing, and I can understand all the topics he explains."

A young girl in a gray and white school uniform with a ponytail, she clenched her fists a little excitedly.

Liu Yanyan looked up at the big words "103 days until the college entrance examination" on the podium, and an impulse suddenly surged in her heart.

Sprint to a wave of 985 universities!

Liu Yanyan's grades are average in the class. If she performs normally, she can get one grade. If she doesn't perform well, she may not be able to get one grade.

And the subject that bothered her the most was mathematics.

And just after hearing Gu Bai explain a set of exam papers in the live broadcast room, she felt that it was not so difficult, and even... very easy.

This excites her a little, because her worst subject is math.

If the math score can be 120-130, she is absolutely confident to sprint to 985/211 university.

"Xiaoyan, stop playing Douyin, there are only more than 100 days left before the college entrance examination."

On the side, the voice of Wang Na at the same table urged the voice.

"I'm not playing Douyin, I'm studying." Liu Yanyan explained as she supported her hair.

There are not many days before the college entrance examination. Now every student in the class is studying hard, and of course they are also supervising each other.

As Liu Yanyan's roommate, Wang Na kindly reminded Liu Yanyan when she saw Liu Yanyan playing on her phone.

"Study, obviously I'm watching Douyin live." Wang Na hehe.

"Really learning."

Liu Yanyan handed the phone to her deskmate and explained, "This live room is teaching 'math'. The word 'country' you asked him about me just now was asked of him."

"Live math teaching?" Wang Na was a little suspicious.

"That's right. He's very good. I can't understand what our math teacher said, but I can understand everything the anchor said, and I have a very deep memory."

After speaking, Liu Yanyan added: "Really, I have understood the most difficult number sequence problem."

cut~~

Wang Na rolled her eyes, completely disbelieving.

"Really, what I said is true." Liu Yanyan explained again.

Wang Na shook her head and ignored it, thinking in her heart, "If this anchor can improve your grades, I will write Wang's surname backwards."

Wang Na doesn't think that live teaching is as good as their teachers.

And... she glanced at it just now, this anchor doesn't even have a decent lecture room, and it looks like a young man, how can he teach well.

Unless... heck.

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