Chapter 128： Katz, Katz, this is the voice of Xueba

Of course, all electronics who are not allowed to bring into the market will be treated as cheating once discovered.

But you can bring three reference materials.

Yes, IMO is an open-book meeting!

But if you think IMO is simple, you are wrong.

IMO has a special rule, that is, every time you make a mistake, not only will you not score, but you will also get a deduction. In other words, if you don’t do 0 points for a question, you will win the championship if you do every question. It may also fall to last place.

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

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

On the left, with a solemn face and trembling all over.

On the right, his face was pale and sweat was raining.

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

As for the back? Uh-fairly calm, although expressionless.

As for the members of the China National Team, Qin Luo looked curiously through the seams.

Surprisingly, their faces were full of excitement and seemed to be eager to try!

Lin Shanshan squeezed her fist, her little heart beating: I didn't expect Lin Shanshan to stand on the IMO one day, earning, earning.

——

Bring biscuits, milk, and three reference books, namely "High School Mathematics Knowledge", "Advanced Mathematical Formulas", and "Three-year Olympic Competition and Five-year Simulation"

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

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

The test questions have been specially translated and agreed to be replaced with Chinese.

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

The most useful thing 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 and Y have f({x}y)=f(x){f(y)}

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

Qin Luo smiled slightly, and looked up at the surroundings. It was all international moves-biting the penholder!

Ha ha-horrible.

Countless people stayed in place with their pen holders, let alone solving problems, 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 clearly 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, forest f (x)=c, substituting for c=c{c}

Therefore c=0, alive {c}=1, that is, 1≤C＜2

If f{(0)}=0, we can get...

...

……Substituting into the formula can get f(x)=0 and f(x)=c, 1≤c<2 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 "worrying hard".

Thinking it was okay, he picked up the biscuit and gnawed it.

"Katz, Katz."

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

what's the situation? What sound is this?

For a time, everyone turned around.

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