As a matter of fact.

In the case of the "Mathematics" skill at the full level.

Even if it's a problem of the level of the Olympiad.

For Kong Xuan.

It's like reading elementary school homework.

There are only those problems that the entire mathematical community cannot solve at the moment.

to be able to call it a problem for him.

So facing Xu Zihan's second question.

Kong Xuan only glanced at it again.

Write out the solution process extremely quickly.

In the eyes of others.

He didn't even think for a second.

It seems that the answer is just on the side and let him copy it!

Watch him put pen to paper quickly.

Not only Xu Zihan couldn't hold back.

Even her father was amazed.

That is, Lin Xuerou's uncle.

His name is Xu Feng.

Identity is the most prestigious university in China.

Professor of mathematics at Qingbei University.

Of course.

The father-daughter relationship between him and Xu Zihan is set in the script.

But the identity of a mathematics professor at Qingbei University is genuine.

He was once known as the youngest professor at Qingbei University.

Before the age of thirty, he had already made his mark in the international mathematical community.

All these years of being a professor.

In the most well-known universities in China.

He has seen countless so-called "mathematical geniuses".

But it's true that it's rare to see a non-math major

Can do so quickly when facing the Olympiad puzzle.

To know.

Even himself.

I'm afraid I'll have to think about it for a while before I can write the answer.

After the surprise.

Xu Feng carefully studied the problem-solving process written by Kong Xuan for a while.

Then I was even more surprised.

Because he found that what Kong Xuan wrote was not an ordinary solution.

Instead, some high-end formulas are used.

This solution is completely beyond the scope of the undergraduate program.

He couldn't help but be curious: "Have you ever been admitted to graduate school?"

Kong Xuan smiled and shook his head.

"It's okay to figure it out. "

Xu Feng nodded.

There is no doubt about him.

After all, there are top students in college.

I did finish my undergraduate course very early.

It is not uncommon to study graduate courses in advance.

This shows that Kong Xuan is also a student at the top level in school.

As a university teacher.

I couldn't help but have a good impression of Kong Xuan.

But as soon as I heard this.

Xu Zihan was not happy.

What do you mean by nothing to figure it out?

Can you, an ordinary little white-collar worker who graduated from an ordinary university, be so talented?

Co-author: You're more talented than me?

She was unconvinced.

I think this guy in front of me must have known the answer in advance.

Although the idea is quite illogical.

Because the second question she came up with was not set in the previous script.

It's a new topic for her.

So Kong Xuan knew the script in advance.

It is also impossible to know the answer.

But at this time, Xu Zihan was already a little angry.

The heart automatically omits these illogicalities.

She decided to use her own skills.

to frustrate Kong Xuan's spirit.

"Hey, that doesn't count!".

"You'll know the answer ahead of time!".

Kong Xuan smiled helplessly

"Isn't that a random question you asked?".

"Where do I go to get the answer?".

He asked.

Xu Zihan was speechless in an instant.

"Then I don't care. "

"I'm sure you've seen the math Olympiad lately!".

Kong Xuan raised his eyebrows.

"So this is an Olympiad problem?"

"I thought you did it yourself!".

Xu Zihan's face turned red.

"Do you think I can't do this kind of question?"

"Humph!".

"I'm afraid that you won't be able to do it and lose face!".

Kong Xuan looked at her funny expression.

Some couldn't help but laugh.

smiled: "Oh~~".

"It turns out that Sister Zihan is thinking about me. "

"That's not it. "

"Sister Zihan has two more questions that don't think about me. "

"Let me try?".

Xu Zihan looked at his smug expression.

Angry and itchy.

Lin Xuerou listened to her boyfriend tease the little girl on the side.

It is also the flower branch of joy trembling.

However, she knows Xu Zihan's true identity.

I know that this little girl hasn't used her real skills yet.

So I looked at my boyfriend.

I can't help but worry a little about him.

Xu Zihan looked up at Lin Xuerou.

The tone changed back to childlike and cute.

"Sister Xuerou. "

"I remember you used to have a little hourglass in your house. "

"Can you find me?".

Lin Xuerou nodded, "Okay, I'll find it for you." "

This is, of course, the premise of the script.

Two minutes later.

Lin Xuerou walked down from the upper floor.

Holding a small blue hourglass in his hand.

Xu Zihan took the hourglass.

It was placed on the coffee table in front of Kong Xuan.

"Let's compare. "

Kong Xuan was stunned.

Looking at the small hourglass with a big palm in front of him, he said in confusion

"Than what?".

The corners of Xu Zihan's mouth raised.

The expression of the arrogant said:

"Addition, subtraction, multiplication and division!".

"Huh?".

Kong Xuan was a little confused.

Addition, subtraction, multiplication and division?

This is indeed a primary school topic.

It coincides with the identity of a little girl and a primary school student.

But just now, this girl has already come up with two college high math questions.

At this point, it suddenly turned into a question for elementary school students.

Let Kong Xuan be a little inapplicable.

But think about it.

Not really.

The first two questions.

It must be after this girl saw it in the Olympiad book.

Memorized down.

The estimate is prepared in advance.

I want to tidy myself.

The current elementary school questions are her real level.

He couldn't help but squint.

glanced at her helplessly.

It's just in Xu Zihan's opinion.

His expression was a sign of recognition.

So I was even more proud.

Go on:

"Here's how the rules work. "

"We take turns giving each other questions. "

"The problem is simply addition, subtraction, multiplication, and division. "

"But every time the question comes out. "

The number in the title. "

"It must be larger than the number in the previous question. "

"For example, I will play 1 plus 1 first. "

"You have to take a minimum of 2 plus 2, or 2 times 2, 2 divided by 2, 2 minus 2, and so on. "

And the answer has to be said before the hourglass is over. "

"Got it?".

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