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 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.
 Celebrating the 7-day National Day holiday and reading books! Charge 100 and get 500 VIP coupons!
 Immediately rush to recharge (event time: October 1st to October 7th)
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 (Academic flow in the early stage, black technology flow in the later stage)
 People are in the university, Gu Bai is bound to the super teaching system.
 As long as someone understands the topic, they can return the knowledge with a hundred times of critical strikes.
 [Ding, you teach students the English word 'apple', 50 times return the word 'orange, blueberry...']
 [Ding, you taught students quadratic equations in one variable and returned the mastery of 'partial differential equations']
 [Ding, you taught the students fluid mechanics, and the super crit returns the 'seven major problems in the world - ns equation']
 ......
 Before he knew it, Gu Bai became a world-class leader in the academic circle.
 At the same time, Gu Bai found that he already had inexhaustible black technology in his hands.
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 Nano core world: 
 Yue Yuanzhou: "You can travel through time by just lowering your head and playing with your phone?!" 
 "It's okay to wear it, but I won't give you a golden finger." 
 "Okay, I'll make one myself." 
 Transformers World: 
 Cybertron is coming to Earth, and this is the end of mankind. 
 Yue Yuanzhou was ecstatic: "Well done, this kind of 'ship' is just right for a low-key person like me!" 
 Super God Universe: 
 Yue Yuanzhou: The dark plane should not exist. I will destroy it and start the Ragnarok era. 
 Degenerate Era Universe: A dark and sad journey. 
 Trisolaran Universe: Welcome, the meeting gift package of light particle strike has been sent! 
 At the beginning of the game, the Nano Core was used to suppress the ultimate move under one person, and it flew directly to the Transformers. From then on, he drove the transforming planet to travel between different universes, from the super seminary to the dark and desolate degenerate universe... 
 New book "Voyage of the Stars"
 <div class="author-novels">
 <h3>Author's Other Novels</h3>
 <ul>
 <li><a class="title" title="Voyage of the Stars" target="_blank" href="/en/serie-6017/voyage-of-the-stars">Voyage of the Stars</a></li>
 </ul>
 </div>
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 This novel is also known as Super Gene Optimization SolutionXia Fei took a bottle of Siwu Gene Optimization Solution with no trademark, no date, no description, and no place of origin. 
 Our story starts here…
 <div class="author-novels">
 <h3>Author's Other Novels</h3>
 <ul>
 <li><a class="title" title="The technological empire begins with polymer materials" target="_blank" href="/en/serie-4925/the-technological-empire-begins-with-polymer-materials">The technological empire begins with polymer materials</a></li>
 <li><a class="title" title="Technological Hegemony" target="_blank" href="/en/serie-2920/technological-hegemony">Technological Hegemony</a></li>
 </ul>
 </div>
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 In the new world of the future evolutionary era, every new human being is qualified to become a super martial artist. 
 The protagonist was born before the beginning and died in the fierce battle of the new world. However, he has witnessed the rise and fall of countless powerful men. 
 With memories of rebirth, he magically returned to the beginning of the disaster. 
 “The future is a brilliant new world! I will definitely surpass the pinnacle of my life, overtake all new human kings, and become the master of the new world in control!”
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 Traveling through a young doctor, the beginning of the scientific research was blamed by the whole network, and he frantically wrote ten papers a month. 
 Some bigwigs in the academic world stood up and said: "Don't say it is a month, writing ten papers a year is all irrigation, all are paper brushes, and it is invalid scientific research." 
 After being picked up, each article is hard power and has a huge impact. 
 Shocked the whole network. 
 When interviewed by the reporter, Wang Hao said indifferently, "I didn't do any special scientific research, those are just my insights in the process of lecturing to students."
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 No one can escape this crisis in the last days, and some are just gods.
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 The end of all worlds approaches.
 The Demon King Order harvests lives from all manners of living beings.
 Within this darkness full of despair, 
 A single person escaped from space-time, returned to before the world collapsed, determined to change the fate of the past.
 But as time pass, he gradually finds out that the Apocalypse isn’t quite as simple as he thinks…
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 [This is a note for narrating strange stories]
 [Write any text on the note, and a contract will be signed with the note]
 [Unless the contractor dies, the contract will not expire]
 [After signing the contract, you can write weird stories on your notes with any pen, and the weird stories you write will come true]
 [There is only one price for signing a contract, and that is all the future life of the contractor]
 A mysterious notebook, a mysterious story, the heart of human beings to explore the unknown, will always be the best helper for the spread of strange stories…
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 After the nth time of failing a marriage meeting, Xiang Han got himself a job: good treatment, high salary, free world traveling with food provided, house provided and even a ‘lover provided’?!
 At first, he thought, apart from having to travel into the body of a scum cannon fodder, a scheming fake white lotus, everything else was okay. It was only later he realized that saving the target was also a problem. His imagination was neverending, even eating a cup of ramen was seen as a way to rouse his ( target’s) interest!
 Xiang Han: This target is a no-go.
 Certain Target: Very good, you’ve already managed to rouse my interest.
 Xiang Han: Go outside and make a left turn to the optometrist, go get your eyes healed! Additionally, this “lover provided” isn’t necessary.
 A Certain Target: This is certainly necessary!
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 Fang Yun has become a snake and got a system, the system requires him to brush up to 10 million reputation values, or face eternal death. So Fang Yun began to crazily upgrade! 
 A beautiful outdoor streamer in the mountains, facing the camera and the live friends sending gifts but was caught by a one-meter-long python. 
 3,000 meters above the sea surface, Lake Logar is suspected of the appearance of water monsters, causing a large number of tourists to explore. 
 On the calm sea, a luxurious cruise ship is slowly moving forward. Visitors stood on the deck as the sea breeze blow. Suddenly, someone found that under the water behind their cruise ship, a black shadow hundred of meters long is following closely. 
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 Traversing to the parallel world where the game concept is still stuck in pk and trade union wars full of krypton gold routines.
 &nbsp;
 Chen Xu obtained the system, so that players can become stronger when they are emotionally excited.
 &nbsp;
 So when Chen Xu came up, he gave players around the world a big one - the immersive VR version of "Battlefield".
 &nbsp;
 Let players return to World War I and feel the cruelty of the bloody battle of the Somme and the Battle of Verdun...
 &nbsp;
 on the battlefield...
 &nbsp;
 pdd: Ya'er! who I am? where am I? How did I die?
 &nbsp;
 A Yin: Quack doctor! quack doctor! Where's your needle!
 &nbsp;
 Sun Yifeng, the giant of the fish market: You are a chicken! Don't fight, it's allies!
 &nbsp;
 Xiaojie: In war, be serious!
 &nbsp;
 Brother Shu: Is this war? So cruel!
 &nbsp;
 And this is just the beginning.
 &nbsp;
 "Elden's Ring" that lets players turn into a werewolf for Lani, "Call of Duty: Modern Warfare" with 141 to smash Makarov's conspiracy, "Red Dead Redemption" with Arthur to complete the redemption, and Sergeant Long smashes the Flood and the Covenant's "Halo"...
 &nbsp;
 Countless classic games were born in the hands of Chen Xu.
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 In the era of universal beast control, the world rules are overturned. 
 Terror and treasure coexist! 
 Danger and opportunity go hand in hand! 
 Qin Mo traveled through time and space, and the initial summon was actually Gray Wolf? ! 
 When others thought that Gray Wolf was a dog. 
 Qin Mo had already counted the forms of Gray Wolf in his mind. 
 Genius form, lightning form, superpower form, invincible steel armor form... 
 Starting with a hand-rubbed mecha in the garbage dump, you said you have an S-level mechanical beast, is it handsome with a mecha? 
 In addition to Gray Wolf, the other summons are not weak, Holy Angewomon, Rule Tom Cat, and Gangster Jerry Mouse! 
 ... 
 Gray Wolf: "On the first day, I took this wolf to shabu-shabu, and it's reasonable to hand-rub the mecha." 
 Tom Cat: "The master is happy, and the whole team is happy." 
 Angewomon: "This farce should end!" 
 Qin Mo: It's broken, the summon is too strong, I'm directly invincible. 
 PS: The original title of the book is "Let you control the beast, you ask Gray Wolf to hand-rub the mecha? 》 
 Copy 1: The Ruins of Distortion, Distortion Frenzy, The Beginning of the Abyss 
 Copy 2: The Age of Navigation, Crazy Upgrade, Strike the Sakura Country 
 Copy 3: Steam Magic, Heroes Compete, I'm the Sixth 
 Copy 4: Ancient Immortal Martial Arts, Nothing to Do Today, Listen to Music in the Brothel
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 From the moment the red moon appeared in the sky, everyone in the world turned crazy. Except me! 
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Xueba: The Knowledge I Teach, The Crit Is Returned

005: This Anchor Has Something

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Xueba: The Knowledge I Teach, The Crit Is Returned

005: This Anchor Has Something

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