How many stars was the difficulty of this question?
For a science student in the third year of high school, it was definitely five stars.
This kind of sequence question was considered one of the most difficult types of questions in the college entrance examination.
Even a university student would have to spend some effort to solve this problem.
In fact, most ordinary undergraduate students wouldn't even know how to solve this series of questions, or they would only know how to solve the first question.
This was because these questions were reserved for students who wanted to enter Qingbei or 211/985 universities. It was very difficult for ordinary students to get full marks.
"Of course you can." Gu Bai smiled confidently and answered the only audience in the live broadcast room.
Although Gu Bai was not a student of a famous university, but…When the college entrance examination ended, he had specifically looked up this question.
Therefore, he had a well-thought-out plan for this question.
Gu Bai habitually turned the black pen in his hand and wrote on the draft paper while explaining,"This is a typical sequence question.”
"From the known conditions given in the question, we can draw two conclusions: When n=1, a1=a2, which is consistent with An2; If n=k,(k=2) the conclusion is true, so we can get Ak2, so when n=k 1 "
"Therefore, when n=k 1, the conclusion An2 is still valid. Therefore, for all n, An2 holds.”
In less than a minute.
Gu Bai asked for the first question.
At this moment, Gu Bai was not in a hurry to continue explaining. Instead, he asked the audience in the live broadcast room,"First question, do you understand?”
"Understood, understood. Streamer, continue!”
Instantly, the ID 'Cat in the Corner' in Gu Bai's stream started posting comments.
"Yes." Gu Bai nodded and continued.
It can be found that the sequence An is a monotone decreasing sequence.
When n=1, S1=32 43. When n=2, Sn3 a2 a3 an3 [2 (14)] So when a=3, Sn2n 4/3
Gu Bai slowed down his pace as he explained the last two questions.
He was afraid that the other party would not understand.
However, Gu Bai had once again underestimated the 20% increase in comprehension from the system's lessons.
Comprehension was also known as the ability to comprehend. It was the most important skill in learning mathematics.
In class, the math teacher would explain a question to some students in one go, while some students had to repeat it several times. The reason for this was the difference in comprehension ability.
Gu Bai did not know how strong an ordinary student could become with the boost of 20% comprehension.
but... The facts showed that Li Sisi could understand the Mathematical Olympiad questions explained by Gu Bai, and the audience in the live broadcast room could also understand the most difficult sequence module in the college entrance examination.
Of course, Gu Bai knew that there was a certain prerequisite for this. This prerequisite was that one had to have a certain foundation.
You can't expect a guy who doesn't even know log and cosplay to understand trigonometrification questions, right?
Wasn't this bullsh * t in broad daylight?
Gu Bai wasn't a god, he was just a small wall.
"666, 666."
"I didn't expect you to be so capable. I actually understood it in an instant, and it didn't feel too difficult!”
"You have to know that it's very difficult for me to understand this kind of question when our math teacher explains it.”
Instantly, three bullet comments appeared.
These three bullet comments were all sent by the ID 'Cat in the Corner.'
Looking at the bullet screen, Gu Bai smiled.
What 6? Isn't this basic?
If you follow me, you'll definitely have no problem getting into a famous university.
Of course, he did not say this out loud.
At the same time, Gu Bai could feel that the audience was probably already curious.
So... He had his first fan.
As expected.
In Gu Bai's subsequent livestream, this viewer with the ID 'Cat in the Corner' did not leave. She was also the one who asked Gu Bai questions.
He or she had obviously become the first loyal fan of Gu Bai's stream.
......................................................
Yang City's First High School in Pangzi Province.
"I understand again, I understand again.”
"This streamer is so amazing. I can understand all the questions he explains.”
A young girl in a gray school uniform with a ponytail clenched her fists excitedly.
Liu Yanyan raised her head and looked at the big words on the podium,"There are still 103 days until the college entrance exam." Suddenly, an impulse surged in her heart.
A wave of 985 universities!
Liu Yanyan's grades were considered average in class. If she performed well, she could get into a first-tier university. If she didn't perform well, she might not get into a first-tier university.
And the subject that gave her the biggest headache was mathematics.
After hearing Gu Bai explain a set of test papers in the live-stream, she felt that it was not that difficult. In fact…It was very easy.
This made her a little excited because her worst subject was mathematics.
If she could get a score of 120-130 in Mathematics, she was confident that she could make it to 985/211 University.
"Little Yan, stop playing the battle of voices. There are only 100 days left until the college entrance examination.”
Wang Na's voice came from the side.
"I'm not playing battle notes. I'm studying.”Liu Yanyan explained as she stroked her hair.
There were not many days left until the college entrance examination. Now, every student in the class was studying hard. Of course, they also urged each other.
As Liu Yanyan's deskmate, Wang Na saw Liu Yanyan playing with her phone, so she kindly reminded her.
"Studying? I'm obviously watching the battle of voices.”Wang Na chuckled.
"I'm really learning."
Liu Yanyan handed the phone to her deskmate and explained,""This live broadcast room is teaching 'math'. Just now, you asked him about the word' country'.”
" Livestream mathematics teaching?" Wang Na was a little suspicious.
"That's right. He spoke very well. I didn't understand what our math teacher said, but I understood everything this streamer said and remembered it very well.”
"It's true," Liu Yanyan added,"I also understood the most difficult series of questions in one go."”
Tsk ~~
Wang Na rolled her eyes in disbelief.
"It's true. I'm telling the truth." Liu Yanyan explained again.
Wang Na shook her head and ignored him."If this streamer can improve your results, I, Wang, will write my surname backwards.”
Wang Na didn't think that a live broadcast was as good as her teacher's.
Moreover... Just now, she had taken a glance. This streamer didn't even have a decent lecture room. She could tell at a glance that he was a young man. How could she teach him well?
Unless…What a ghost.
This book is provided by FunNovel Novel Book | Fan Fiction Novel [Beautiful Free Novel Book]