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 In the quiet classroom, Xu Chuan flipped through the math textbooks. Among the thick stack of books on his desk, some were borrowed from the library for the first and second grade math textbooks.
 After all, too much time has passed, and he has forgotten what the textbooks look like. If he wants to read them, he has to read them from the beginning, so as not to miss some knowledge points and lose points in the exam, which will make him feel ashamed and lose his life.
 A Fields Medal winner who can't get full marks in ordinary high school competitions might as well be reborn and smash his medals back home to grow sweet potatoes and raise pigs.
 After more than an hour, the bell rang for the end of the lunch break, and Teacher Gong, who Song Kaiji said would be here soon, entered the classroom.
 "Hello, Teacher Gong."
 "Hello, Teacher Gong."
 In the classroom, the students who were reading and working on the questions all greeted each other. Xu Chuan raised his head, and what caught his eyes was a man in gray and black checked wool, not tall, and wearing a pair of glasses.
 Completely different from Song Kaiji's half-bald hairstyle, Gong Rihui's hair is very thick, so thick that it makes people wonder if he studied mathematics, and it is so thick that it does not meet the concept of baldness in the impression of a mathematics teacher. .
 "Hello, Teacher Gong."
 Xu Chuan also greeted respectfully. As a contestant who often participates in competitions, although he is not in the same subject, he still knows each other.
 Don't look at Mr. Gong's bushy hair, which doesn't look like he's a math student, but he has been leading the Xingcheng No. 1 Middle School mathematics competition training team for more than ten years, and the students who have gone out from him have even won IMO gold medals .
 "Is Xu Chuan here? Come on, come up and do the questions first."
 Gong Rihui glanced at the classroom and saw that there were more people in the classroom at a glance. He smiled and wrote a math problem on the blackboard with his backhand, and then called Xu Chuan directly.
 He naturally knew this proud boy who studied physics. Like Song Kaiji, he also felt that it was a pity that such a good young man went to study physics.
 How good I am in mathematics, the foundation of all subjects!
 Without mathematics, you can’t even calculate how much change you get for a dish.
 "Find all pairs of positive integers (x, y) that satisfy xy=y^x-y. (^ means square)"
 A math problem was written on the blackboard by Gong Rihui casually, and the white chalk was thrown on the desk. He looked at this physics genius in the audience with a smile.
 Xu Chuan is no stranger to the tune of doing the questions first when entering the classroom.
 Whether it's physics or mathematics, on the way to the competition, there are only two words of solving problems. He has experienced this kind of scene countless times, and he is very familiar with it without the slightest nervousness.
 "Brother Chuan, come on, go up and explode your chrysanthemum, I support you!"
 Beside him, Lu Tianrui, with a round face, whispered cheers.
 Just as Xu Chuan stood up, he staggered suddenly when he heard the words, and barely stood up by holding on to the table.
 Playing math, so perverted?
 In front of the blackboard, Xu Chuan casually took out a piece of chalk from the podium. The problem posed by Mr. Gong was difficult to say the least. In fact, most high school students could solve part of it.
 Just like the last major question of mathematics in the college entrance examination, the first small question is basically free and easy to solve.
 But the difficulty of the following small questions increased exponentially.
 The question on the blackboard is the same. In the college entrance examination, it belongs to the last one or two major questions. But in the competition, it is just a junior high school question after getting started. The test is reasonable reasoning and analysis. The ability to solve problems is more comprehensive.
 It is not difficult and easy to judge, even a junior high school student can see that its first answer is (1, 1).
 In front of the blackboard, Xu Chuan glanced at the topic and thought about it for a few seconds before starting directly.
 "Solution: It is easy to find that x=y=1 satisfies the meaning of the question, so x=y=1 is the answer, there is a solution, and when the equation has a solution, there must be x≥y.
 If x=y, then x=y=1.
 If x\u003ey≥2, then 1\u0026lt;(x/y)^y=y^x-2y is obtained from x^y=y^x-y, and y|x.
 Let x=ky, then k≥3, k^y=y^(k-2)y, so k=y^k-2.
 Because y≥2, so y^k-2≥2^k-2, because when k≥5, y^k-2≥2^k-2\u003ek, so k=3,4.
 When k=3, y=3, x=9; when k=4, y=2, x=8;
 Therefore, all positive integer pairs (x, y) = (1, 1), (9, 3), (8, 2) are sought. "
 The chalk under his hand did not pause at all, and in just one minute, the complete verification process was listed on the blackboard.
 Gong Rihui glanced at the blackboard, nodded in satisfaction, and said, "That's right, the thinking is clear, the verification is concise, and the format is standard. It's a good seed."
 "However, I want to remind you that there are some differences between Shujing and Wujing. The Wujing side will more or less involve some university knowledge, but there is basically no knowledge in the Shujing. Mathematics solves it.”
 "If you have self-taught college mathematics such as advanced mathematics, try not to use it in domestic competitions, because it may lead to deduction of points for solving problems beyond the outline."
 "Of course, it doesn't matter if you can break into it IMO."
 Xu Chuan nodded, expressing his understanding.
 In fact, the students participating in the competition, whether it is mathematics or physics, or even chemical and biological information, have basically read some college textbooks, but the depth of reading varies from person to person.
 He was no exception. He basically finished reading textbooks such as advanced mathematics, mechanics, heat, electromagnetism, optics, and quantum physics that are only used in universities in the third year of high school.
 If you use college mathematics to solve problems when participating in the competition, it will undoubtedly be a dimensionality reduction blow to other students who have learned less, which is unfair.
 In the early years of the competition, whether it was domestic or international, it was generally forbidden to use university knowledge to answer questions, but this latter rule has relaxed a lot for other subjects except mathematics.
 Like his major in physics, in recent years, IPHO has taken a lot of college knowledge. Last year, he even took a test in circuit design, which is more than a sophomore.
 As for mathematics, the current IMO does not prohibit the use of university knowledge to answer questions. Instead, the question maker should design the questions to prevent candidates from using university knowledge to answer questions.
 Those who can give IMO questions are all masters in mathematics. Their knowledge range is definitely much stronger than that of rookies who participated in IMO in high school. You can only use high school knowledge to solve the questions you can solve.
 If in this case, you can still use the superclass knowledge to solve the problem, it doesn't matter.
 Although fairness is necessary, isn't the purpose of IMO just to screen out mathematical geniuses?
 Your knowledge in high school can break through the blockade of these mathematicians and professors, so there is no need to fear that you will be forced to deduct some points for your pride.
 Of course, this is not to say that you don’t need to learn college mathematics if you don’t need it. On the contrary, it is still necessary to learn some college mathematics.
 Because it can broaden your thinking and make it easier for you to solve problems, so as not to double your brain cells.
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 An aviation disaster brought a genius in physics and materials back to 20 years ago. Starting from mathematics, ending with physics, with materials as the backbone and energy as the blood, a great country set sail here ...... 
 The rebirth of academicians, the beginning of science and technology, the eternal existence of stars, and the eternal prosperity of the human race.
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 The strangest fate, the most exciting mind games, the cruelest survival battle, the craziest fantasy, the most bizarre truth… The first is here to battle for another ten years! 
 <div class="author-novels">
 <h3>Author's Other Novels</h3>
 <ul>
 <li><a class="title" title="The Ultimate Evolution" target="_blank" href="/en/serie-3760/the-ultimate-evolution">The Ultimate Evolution</a></li>
 </ul>
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</div>

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 The sun goes out, and disaster comes. 
 A hole with blood and darkness stands in the sky, the sky mourns and cries, and blood and tears pollute the earth. 
 In the darkness, shadows cover the dead city, the things of the past eat the flesh and blood of the living and the ruins of civilization, and the disaster is like an immortal king looking down at the ups and downs of the earth, and will take the world entering destruction as a coffin. 
 ... 
 Fortunately, all this has not started to happen. 
 On the eve of the end of the world, Su Hong accidentally obtained a doomsday simulation game, which can bring disaster items back to reality through simulation. 
 In the simulation, he explored the disaster end of the world, hid behind the scenes in reality, created vests, and founded major disaster organizations... 
 At first, he just wanted to survive in the end of the world, but after countless simulations, he suddenly found that he accidentally cleared the end of the world in advance. 
 The shadow demon who set off the dark disaster, the sun knight who burned himself and illuminated the night, and the plague dragon who covered the world with the wings of plague. 
 The Lord of the Veil, the Blazing Knight, the Tomb King... When great beings appeared one after another, the whole world was shaken and terrified by disasters. Only then did everyone realize that these ancient beings who had saved the world were actually his vests.Author's Other NovelsMythical Card Master: Start with the Knight
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 "Pretty state-owned fruit phone, Yan country has Kunpeng mobile phone, Kunpeng mobile phone is worth owning." 
 "Ouch!" 
 At this time, Yanguo is the transition point between 3G and 4G, and the domestic mobile phone market is full of contention, and the most important chip is indeed in the hands of foreign companies. 
 Shen Fangnan, who was reborn in 2013, took over his own knockoff mobile phone company that was on the verge of bankruptcy. With the help of the system, he overtook corners in the fields of chips, 5g, computers, artificial intelligence, automobile manufacturing, and rocket recycling. world. 
 Black technology + mobile phone + business warfare + industry + Internet of Things. 
 (Technology and hard work.)
</div>

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 Rebirth of Marvel, Luo Hua became the king of angels!
 
 He has the ability to set all the angel civilizations!
 
 Angels, heaven, heaven, treasure house of knowledge, as long as they have enough energy, these can be created!
 
 Odin: “The king of angels, only you can save the gods of Asgard.”
 
 Wanda: “How much do I need to pay to be an angel?”
 
 Thanos: “Angels are the most beautiful creatures in the universe. I said it! “
 
 Steel body? Sorry, this is the basic configuration of a generation of angels.
 
 Have you heard of Wings of Time and Space, Great Judgment, Sky Blade Battleship, Star Slashing, Silver Wing, and Vibrating Gold Armor?
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 Ten years ago, Zhou Xianfu came across and bound the system. In ten years, it has become a world-class financial oligarch. And ten years ago, he knew that the end is coming, and human beings can only resuscitate manually to save themselves!
 System: “Task 1: Make at least 5 billion people around the world recognize the existence of Xian/Wu.”
 “Task 2: Disseminate the simplified version of the “Supreme Qi” to the world, and enable at least four billion people around the world to officially start practicing. It will cause the earth to bottom out, and the spiritual energy will explode!”
 It is planned to prepare for three years in ten years. The purpose of the event is to promote national martial arts. With a prize of 150 billion U.S. dollars, the reality show “The Last Strong” has officially started.
 Global madness.
 Mercenaries, boxers, fighters, martial artists, and some masters all think that they will be the leader to take 100 billion US dollars.
 And no one knows who they are on the same track…
 Wudang: “Please come out of the mountain!”
 Bagua Gate: “Ancestor, please appear in front of the world again.”
 As a result, in everyone in the world that this is just a live broadcast of fighting games, fairy characters have appeared on the stage. Shock the world!
 World boxing champion: “He he… He smashed a mountain with one foot, how can I fight him?”
 The UFC champion is crazy: “Run at sea? One jump for hundreds of meters? Why, why have you never seen them in the Olympics? God…”
 At this moment, the world has officially entered the age of practice!
 Zhou Xianfu: “It’s time, come on, follow me to promote the aura recovery!”
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 As soon as he woke up, Rick returned to his senior year’s class. The classmates took their swords and sticks to class, and the teacher became a woman Taoist.
 Little fat man in the back seat, why are there two big hammers under his chair.
 Lake discovered that this is an era of global travel!
</div>

<div class="content">
 Qin Mu has traveled to a different world where everyone can become a god, ignite a god fire, condense a godhead, and design his own subordinate world.
 &nbsp;
 And everyone has their own domain of the gods, as well as the races that live in it.
 &nbsp;
 Orcs?&nbsp;Elf?&nbsp;It’s all weak, my design is a sci-fi heaven!
 &nbsp;
 However, how come these buildings are still alive?
 &nbsp;
 Thirty-three Layers of Heaven Ascension Platform: Tianhe Guards, can you do it? If you can’t, let me come!
 &nbsp;
 Orbital Star Destroyer Sword: What are you beeping with them, I will kill them with a sword!
 &nbsp;
 The Heavenly Mothership Lingxiao Palace: Shut up, the Quyue Ship of the Underworld will finish the fight on the opposite side!
 &nbsp;
 Ghost Soldier Ghost General Star Destroyer: I’m fighting the elite!
 &nbsp;
 Gene Weapon Meng Po Tang: Leave me some prisoners for experiments!
 &nbsp;
 Finally, one day, Qin Mu suddenly discovered that he not only became a god, but also conquered countless planes and crystal walls!
</div>

<div class="content">
 Su Qi opened a refitting factory, originally he just wanted to be a boss and be free. 
 After the modification system came, everything changed. 
 Ultra-high-precision lathes, high-performance engines, high-performance chip manufacturing processes... 
 Various military and civilian technologies were unlocked from his hands. 
 With system upgrades, solid-state hydrogen batteries, controllable nuclear fusion, space elevators, interstellar warships... 
 The fifth industrial revolution, the sea of stars, will set sail from China!
</div>

<div class="content">
 Xu Xiangyang has two good friends, one is the girl next door who lives in the same alley, and the other is the monitor girl in the class next door;
 Xu Xiangyang has an ulterior secret. He knows that one of his two friends has a great devil who can destroy the world…
 ~
 This is a slightly frightening and warm youth story.
</div>

<div class="content">
 Well-known Composer Fang Zhao was in the glorious stage of his career, when the Apocalypse arrived; After finally experiencing the bitter difficulties of a thousand dangers, when the Apocalypse was simmering down to an end, he collapsed; When he opened his eyes, he was reborn in a New World, 500 years after the end of the apocalypse, in the body of a student who had been dumped barely after graduation, who had been cheated of his hardwork barely after he started working… 
 The World of the Future, Virtual Idols PK Real Idols 
 “Every time background music plays in my head, I feel like there is nothing to be afraid of.” —Fang Zhao 
 Toward the end of the apocalyptic period, Fang Zhao lost his life. However, instead of dying, he found himself 500 years later in the body of a young and aspiring composer who shared the same name. Having received a second chance at life, Fang Zhao sets out to achieve the previous owner’s dreams. 
 Armed with the experience of living through an apocalyptic age and his profession as a composer before that period, Fang Zhao uses his talent, wits, and knowledge to make his mark in the entertainment industry of the future.
</div>

<div class="content">
 After becoming a movie queen and retiring after being successful, Tao Ran, who has worked hard for many years, just wants to make good use of the last time of his life. 
 Helplessly, the cheating script took a fancy to her ability to cause trouble and forcibly pulled her into the small world. 
 The first world, the vicious sister group in the entertainment industry? 
 Tao Ran: The entertainment industry is my home field. Let me set up a counterattack and crush them directly. But before that, I have to take them for a few rounds! 
 In the second world, a married man who wants to live in poverty? 
 Tao Ran: Scumbags must be tortured! Together with his hated mother and sisters, let me pack them up and tear them apart with my hands, but before that, I want them to cry and shout "Dad, spare my life"! 
 The third world... 
 Tao Ran: Since I entered the small world, my waist is no longer sore, my legs are no longer painful, my food tastes delicious, and my whole body feels full of energy! Hello! It doesn’t matter what plot or background you are in, just come on over! 
 The person who was called "Hey" held a lot of gold fingers that he had not yet given out: Boss, you are a born heroine and a real boss! 
 No CP, the author said the quality is good, you can eat with confidence~
 <div class="author-novels">
 <h3>Author's Other Novels</h3>
 <ul>
 <li><a class="title" title="The heroine of Quick Wear, she can do anything" target="_blank" href="/en/serie-5388/the-heroine-of-quick-wear-she-can-do-anything">The heroine of Quick Wear, she can do anything</a></li>
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<div class="content">
 Zhou Mian, the God of War in the Glacier Empire, and his enemy, Admiral Cecil of the Earth Federation, fought on the battlefield for six years and lost.
 What to do if you lose the battle?
 Oh dear!
 With a patriotic heart of generosity and righteousness, Zhou Mian gritted his teeth and prepared to accept the torture from the Federation, endure his fierce opponent , and live a life worse than death from then on, however…
 Cecil: Madam Are you tired? Come here and I’ll give you **.
 Cecil: Saturn’s tribute grapes, all for you to eat!
 Cecil: Madam, the bed is warm! Come, let’s sleep /v\
 Zhou Mian: …
 um… what’s wrong?
</div>

Great Country Academician

Chapter 6 Come on, do a question first

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Great Country Academician

Chapter 6 Come on, do a question first

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