All-round mathematician

Chapter 156 The Olympiad Opens
As soon as Yang Fan's cell phone was turned on, there was another text message. Only three people knew the number, his parents and Xiao Hongye.

Played my mother's phone number and connected: "Young man, you just turned on the phone, you are going to die."

Yang Fan stared at the screen in a daze, the number was a number, and it was impossible for him to dial the wrong number, so this is his mother and Xiao Hongye together?what's the situation?
"Goddess, are you at my house?" The time in New York is 9:11 in the morning, so shouldn't it be 12-[-] in the middle of the night over there.

"Auntie is watching TV on the sidelines, so she doesn't bother to pay attention to you, so she asks the goddess to answer for you."

"I'm asking why you're still together so late, you don't go home and idle away."

"Young man, if your ending ability is half as good as your talking ability, then you don't need to worry about your aunt and uncle. I have inquired for you. There are more than 20 media lurking in your community, and it is so cruel to trample you to death since you were young." Everything has been dug out."

Yang Fan disdains it, and spends his days focusing on such trivial things as killing ants. He has the ability to tell the whole country about his urinating everywhere.

"Then my parents live at your house?"

"No, there is a property outside, and the goddess will help take care of it by the way."

With the status of the Xiao family in Wuzhou, the parents are absolutely safe. Yang Fan praised Xiao Hongye's methods. When he thought of the thesis, it was rare for him to be serious. It's bigger than that."

"How big is it?"

"The earth will shake three times."

Xiao Hongye took a deep breath, and Yang Fan nodded. Xiao Hongye could still tell the big things clearly, and his character was not bad.

"Young man, don't you want to sun the earth, with a convulsion in your body, everything becomes dull."

Yang Fan almost squeezed his phone, and it turned out to be so crooked when talking about business.Where is the bottom line, no wonder the other students said that Xiao Hongye likes to talk dirty jokes, she really is a super female hooligan.

"How far is my mother from you? Do you dare to tell her in front of her?"

"I was talking to you on the window sill. Of course Auntie Song was very conscious. The Goddess suddenly discovered that Auntie's mind was so clear, and the Goddess had just found a way. Talk to her about "Legend of Chujiao", and many plot routines were analyzed by your mother. All non-dragon men who appear, even enemies, will fall in love with the heroine, and the plot is guessed nine times out of ten, as expected of the hero of female video pioneers back then, many of the plots are left over from her playing back then."

"Even this you know."

After the family dinner that day, Yang Fan even inquired about his mother's author number, refreshing his views.My mother can only write brain holes, more than a dozen books start with [-] to [-] words, the plot is wonderful, but there is no way to continue, books and eunuchs.

His character was ruined, even if his vest was opened, he was still picked up according to his writing style, and since then he has not dared to stand out when diving.

Thinking of this, Yang Fan was stunned, Xiao Hongye led him to mislead such a big deal.He slapped himself severely, and cursed angrily: "Let's do this first, my parents should ask for leave first when they go to work. The matter is really big."

"Young man, Goddess has a call from the little hooligan in America..."

"The little rascal is useless, hang up, thank you goddess."

Every time after bragging with Xiao Hongye, Yang Fan feels very relaxed, this phenomenon is very strange, the other party seems to have a funny aura.

------

People from more than 100 countries have all arrived, and the International Mathematical Olympiad has finally opened.

In order to show the importance attached to the Olympic Games, the entire hotel was reserved by the organizer, and there were some media and visitors from all over the world, ranging from 3000 to [-] people.

It has to be said that the International Mathematical Olympiad is becoming more and more valued by Western countries. Countless mathematical geniuses who have reached the apex all started to rise from the Mathematical Olympiad.

This is a competition of the younger generation in the world, and even the North Korea, which is less than a pot of urine with all the countries in the world, sent people to participate.

Most of the meeting rooms in the hotel were emptied, and desks were set up, and those countries that played soy sauce would be assigned to remote places.

And the old strong teams will gather in one place, doing questions under the eyes of dense cameras, surveillance probes, and on-site supervisors.

On the first day, the opening ceremony was coaxed past, and at eight o'clock on the second day, all the students were seated.

Mathematical Olympiad rules, the host country sets the questions, and the teacher who leads the team translates them into the national language and gives them to the students.

Every time the teacher leads the team, he must be proficient in the language of the country, otherwise he will not even know how to translate the topic, and he will lose face internationally.

Teacher Qian got the questions, quickly translated into Chinese, printed the test papers, and after several verification procedures, the staff distributed the test papers to the six students.

The seats were naturally assigned randomly. Yang Fan was in the middle section. Looking left and right, there were people of all colors and races.

At the beginning of the live broadcast, the students bowed their heads to check their calculations. In 4 and a half hours this morning, there were only 3 questions.

Question [-]: Let I be the incenter of triangle ABC...Prove: Triangle RIS is an acute triangle.

Yang Fan narrowed his eyes, and muttered: "It seems that there are not many tricks in mathematics in high school. It depends on whether you can find that little inspiration. It seems that the missile positioning geometry problem done in the training camp is not as difficult."

Obviously, the students present are all the top students in the country, and no one is necessarily worse than the other.

There are chairs against the walls on both sides of the lobby. As soon as Teacher Qian sat down, Teacher Zhou next to him couldn't wait to whisper, "How difficult is the problem this year?"

The topic was translated by Mr. Qian, who is a veteran and can recite it naturally after reading it, deducing the difficulty of it.After thinking for a while, Teacher Qian said: "The first two questions are within the normal range. Among the six people in our country, I guess at least five people will definitely be able to do it. It is the third question..."

"How is it?" Teacher Zhou tensed up and almost cried out.

The supervisor at the scene glared at him.

Any movement can interfere with the students' thinking. Unrelated personnel are cleared, the media can only set up the cameras and leave, and the supervisors are not allowed to move around. They can only check the behavior of the students through surveillance.

Turn off your mobile phone when you enter the scene, and communicate with gestures and eyes as much as possible.

"It's a bit wrong. It seems that the question is wrong." Teacher Qian frowned. Every time the Mathematical Olympiad is only available from English-speaking countries, Teacher Qian is the part-time translator of the team leader. He has been involved in the Mathematical Olympiad for 20 years.

Most of the time, he can calculate the result immediately after looking at the question, and he can even estimate how much time the students will spend.

"The topic can't be wrong." Mr. Zhou is also an expert.Americans attach more importance to academics than other countries. Such a big joke will spread around the world for decades.

Moreover, the United States has held it several times. With experience in this field, the process of making questions must have been verified by many parties.

"Even if you are wrong, it doesn't matter if everyone's scores are the same." Teacher Qian comforted himself. It was the first time he encountered a question that was difficult for him, so he quickly took out a pen and paper to check the calculation on the spot.

There was no sound at all at the scene. For two full hours, Teacher Qian was still struggling with the last question, sweating profusely on his forehead.

"Or not?" Teacher Zhou said.

"It seems to be wrong." Teacher Qian looked around, the leading teachers who represented the country were also dumbfounded, and half of the students at the scene looked forward with blank eyes.

"This question is weird." Yang Fan bit his pen, lost in thought.

The graph is very simple, the triangle ABC, AC and BC have two points D and E, the angle EAB is 70 degrees, and the angle ... is 10 degrees. Find the number of X angles.

"This is simply a question about learning triangles in junior high school. Is it that simple?"

The graphics are clear at a glance, and the conditions are simple. My first reaction is that I took the wrong paper.

Yang Fan doesn't care, just do it slowly according to the train of thought, and write down:

∵The sum of the interior angles of a triangle is equal to 180°∠AEB=180°-∠EAB-∠EBA...∴x=50°
In less than a minute, he figured out the answer without any hesitation or pause.

"Absolutely impossible. Another way is to verify the answer."

∵∠CED=∠ACB+∠CDE...∴x=60°
The two answers were very simple inferences, the thinking was very smooth, and the hands didn't stop, but they came up with completely different answers.

"This... what's the situation?"

The third time, calculate again, but get a 40°. Three times and three methods, it seems very simple, but the answer is not the same at all.

Yang Fan was a little puzzled, and also wondered if the topic was wrong.

He looked up and looked around. The teachers on both sides of the team were biting their ears, and the voices of the discussion could hardly be suppressed. The Americans in front of them were extremely calm.

"There must be a solution. Americans are showing their IQ. Fuck."

Think carefully about the topic again, and after 10 minutes, he finally understood.

"It turns out that the degree is used to mislead people. It needs to be calculated by the ratio of the length of the line segment. It is a huge amount of work."

Several sheets of scratch paper were covered by him, and the amount of calculation was the most among all mathematics in high school.

The answer turned out to be 35°.

After finishing this question at the end, he clicked on the next step, and it took 64 steps.

"Awesome." Yang Fan gave a thumbs up. This is algebraic geometry. There are such a group of mathematics practitioners who are born to show their IQ.

(End of this chapter)