Of course, all electrons who are not allowed to bring into the arena, once found, will be punished as cheating.

However, you can bring three references.

That's right, IMO is an open-book meeting!

But if you think IMO it's easy, you'd be wrong.

IMO has a special rule, that is, every time you make a mistake, not only will you not get points, but you will also be deducted. May also fall to last place.

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

"Heh, interesting rules." Qin Luo smiled lightly and turned to look at the surrounding crowd.

On the left, his face was dignified and his whole body was shaking.

On the right, he was pale and sweaty.

The front, uh—can't see clearly, but judging from his trembling body, he must be nervous to death.

As for the back? Uh—pretty calm, though expressionless.

As for the members of the Huaxia team, Qin Luo looked curiously through the seam.

Surprisingly, they were all excited and seemed eager to try!

Lin Shanshan clenched her fists, her little heart beating incessantly: I didn't expect that Lin Shanshan would also stand on IMO one day, earning, earning.

——

Bring biscuits, milk, and three reference books, respectively "High School Mathematics Knowledge Encyclopedia", "Advanced Mathematical Formulas" and "Three Years of Olympic Games Five Years Simulation"

That's right, Huaxia's manufacturers are so awesome!

After packing up the "props", Qin Luo walked into the examination room under the guidance of the staff.

The exam questions have been specially translated and agreed to be replaced in Chinese.

When Qin Luo got the test paper, he suddenly found that the information he brought was useless.

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 numbers X, Y have f({x}y)=f(x){f(y)}

Hehe, Qin Luo's eyes flickered, this question is quite interesting. He applied the knowledge of junior high school and high school to the extreme.

Qin Luo smiled slightly, looked up and looked around, all the actions that caught his eye were international actions—biting the pen!

Hehe - horrific.

Countless people stayed in place while biting the barrel of the pen, not to mention solving the problem, they couldn't 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, we can get f(0)=f(x){f(0)}(*), if {f(0)}≠0, then f(x) is a constant function, and f (x)=c, can be substituted into c=c{c}

Therefore c=0, alive {c}=1, that is, 1≤C\u003c2

If f{(0)}=0 can be obtained by (*)...

...

...Substitute into the formula to get f(x)=0 or f(x)=c, 1≤c\u003c2 all meet the requirements and are all solutions.

This is IMO, it feels very relaxed, Qin Luo put down the pen in his hand and looked at the people around him who were "working hard to write".

Thinking it was all right, he picked up the biscuits and nibbled them.

"Katz, Katz."

In this quiet classroom, the cracking sound of cookies could be clearly heard.

what's the situation? what is this sound?

For a time, everyone turned around.

But the next second, they were shocked, Qin Luo was holding the biscuits and sending them to his mouth.

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