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Published at 1st of November 2021 03:37:19 PM


Chapter 128: 128

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Of course, all electronic who is not allowed to bring into play, once found, will be punished as cheating.

But you can bring three references.

Yes, IMO is an open book meeting!

But you are wrong to think that IMO is simple.

IMO has a special rule, that is, every time you make a mistake, you will not only fail to score, but also be reversed. That is to say, if you don't get 0 points for a question, you will win the championship. If you do every problem, you may fall to the last place.

This is IMO, this is the stage of the strong!

"Oh, interesting rules." Qin Luo's faint smile turned to look around the crowd.

On the left, his face was heavy and trembling.

On the right, pale and sweating.

The front, er - can't see clearly, but judging from his shaking body, he must be nervous to death.

As for the back? Er - quite calm, though expressionless.

As for the members of the Chinese team, Qin Luo looked curiously through the seams.

Surprisingly, their faces were full of excitement and they seemed ready to try!

Lin Shanshan clenched her fist, and her little heart beat: I didn't expect that I, Lin Shanshan, would stand on IMO one day, making money and making money.

-

bring biscuits, milk, and three reference books, namely "complete knowledge of high school mathematics", "advanced mathematical formula", "three-year Olympic Games and five-year simulation"

Yes, Chinese manufacturers are so competitive!

Clean up the "props", Qin Luo in the staff led, into the examination room.

The examination questions have been specially translated and agreed to be replaced by Chinese.

All of a sudden, Qin Luo didn't use any of his test papers when he got them.

The most useful is bread and milk.

The former can fill the stomach, the latter can quench thirst.

1: Find all functions f: R → R, so that any real number x, y has f ({x} y) = f (x) {f (y)}

hey hey, Qin Luo's eyes twinkle, this problem is quite interesting. He used the knowledge of junior high school and high school to the extreme.

Qin Luo smile, looked up to look around, eyes are all international common action - nibble pen!

Ha ha - miserable eyes to see.

Innumerable people bite the penholder to stay in place, let alone solve problems, they can not even move the pen.

Alas, the master is so lonely

Qin Luo shook his head and started writing. In just a few minutes, the answer was already on the paper.

Solution: let y = 0, then f (0) = f (x) {f (0)} (*). If {f (0)} ≠ 0, then f (x) is a constant function. If f (x) = C, then C = C {C}

therefore, C = 0, alive {C} = 1, i.e. 1 ≤ C < 2

if f {(0)} = 0 is obtained by (*)

……

…… If f (x) = 0, f (x) = C, 1 ≤ C < 2, we can get all the solutions.

This is IMO. I feel very relaxed. Qin Luo puts down his pen and looks at the people around him who are "writing hard".

Thinking of nothing, he picked up the biscuit and chewed it.

"Katz, Katz."

In this quiet classroom, the crackling sound of biscuits can be heard clearly.

What's the situation? What's that noise?

For a moment, people turned around.

But the next second, they were shocked. Qin Luo was taking the biscuit and sending it to his mouth.




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