I really don't want to lie down and win

Since no graphics are given, this question requires spatial imagination, slowly deduced with logical thinking, and then verified with mathematics... Although I understand this truth, it is too difficult to do it.

If you simply find the angle, then you can use the convex quadrilateral calculation formula, but this question does not give any numbers, but only a few conditions...

This... is this really a high school question?

Sure?

Most people did not skip this question, but started to solve it.

but,

During the derivation process, all the contestants found a problem, they could not find any evidence about the derivation, that is to say, there was no evidence for the derivation, and there were even logical errors.

OMG!

Which neuropathy problem is this?

What about sending sub-questions?

give up...

Coming to the second question,

This group of people fell into confusion again. They understood the topic, but after understanding it, they didn't have any ideas.

jump over!

jump over!

jump over!

Jump to the end, there is no jump to jump...

at this time,

Only then did the contestants realize that this year's Zhejiang Provincial Mathematical Olympiad was full of difficult problems, and they were so difficult that they were not even given a sub-question.

Who asked this question?

Is it human?

The expressions of all the contestants were a little depressed, and the atmosphere gradually became depressed. Since this is the case, what else can we do?I can only bite the bullet and answer the question!I can't sleep.

Let's stick to the first question first... It seems that this is the least inscription.

Everyone understands a truth, and if they can't solve it, so do others.

The players on the court looked desperate, while the teachers outside the court looked confused.

"???"

"???"

"???"

This... what's the situation?

I feel that the atmosphere of the game is a bit wrong!

Why no one answered the question?

They seem to be skipping topics!

The dozen or so leading teachers are veterans. Some of them have led the team more than once, but they have never encountered such a situation. Almost all of them are skipping questions.

How can it be?

These students are all math prodigies selected by municipal competitions. How could this happen?It's not that one or two students are skipping questions, but a large number of students are constantly skipping questions.

This is not in line with the common sense in the past, unless the rules of the game are changed or the difficulty is increased.

Otherwise it would be impossible.

"Teacher Wang?"

"What...what's the situation?" A teacher who led the team found the teachers of other municipal teams and asked with a confused face: "I feel that something is wrong, the students shouldn't have this expression, look Look... this is clearly a problem that cannot be solved."

"Who knows!"

"I'm also very puzzled... how is this possible?" The teacher frowned, as if he was thinking about something, and said after a long time: "I suspect...the question maker has changed, and replaced it with someone who likes to ask questions. "

"I think so too."

Under everyone's speculation, a conclusion was reached, that is, the difficulty of the topic has been increased.

Super class?

It shouldn't be possible... After all, it's a provincial Mathematical Olympiad competition, so I won't make such low-level mistakes.

But who can explain this kind of thing clearly.

however,

Among the teachers, Mr. Liang Fengliang from the Ning City representative team seemed to have thought of a possibility.

Xu Mang's appearance yesterday might not have been a coincidence.

Xu Mang,

Arena,

problem...

All of this is too coincidental, and there is only one possibility under such a coincidence, which is not a coincidence at all.

Is it...

Teacher Liang suddenly had a terrible idea. He thought that this time the topic was written by Xu Mang himself; As a result, the whole army was wiped out.

I heard that Chinese New Year...was pretty miserable.

Two and a half hours had passed since the game.

There are very few people who have completed the second question, and about seven people have completed the second question.

but,

Soon everyone found the loophole left by Xu Mang.