PS. Today is the sixth update, please book all the orders! Thank you everyone!

"Li Chunfeng, what are you doing?"

Li Chunfeng took out a book from his arms.

And spread it out.

Pointing to the words above, "Did you write this?"

When Li Yan saw it, wasn’t it the problem I solved some time ago?

The numbers above are still very obvious.

25x^2=(x1)^2=X^22X1

2X=25-1

2X=24

x=12

...

He had no intention of hiding it.

"Yes, I solved the question casually after reading that day. What's the matter?"

What a casual one, what else can't he do?

"Sixth Prince! Li Chunfeng is polite!"

Li Chunfeng knelt down on the ground again and shouted.

You know, Li Chunfeng and Li Yan don’t know each other.

For more than half of the time, Li Chunfeng was outside and occasionally went to see Li Shimin.

As for Li Yan who has been in the deep palace for many years, he will never see him.

Li Yan thought, is this OK?

Was it discovered so quickly?

"How do you know who I am?"

Li Chunfeng then said: "I have read your problem-solving steps before, which are very clear and admirable.

I wanted to know who explained this question, and that was really a genius. Then I took the book to the palace and asked His Majesty to send someone to help my subordinates find the answers.

I didn’t expect that Your Majesty knew your font and said it was done by the Sixth Prince. Since that day, my subordinates have been asking about the Sixth Prince, but they have no clue."

In this way, Li Yan understood a little.

Unexpectedly, Li Shimin understood his own words before he concluded that it was his own.

So when Kong Yingda received the poem, Li Shimin also knew what he wrote?

It turned out to be good, let Li Er know that he was not bad, and he was still subtly affecting the trend of the Tang Dynasty.

Make the Tang Dynasty stronger.

Only by proving oneself can we build the Tang Dynasty stronger.

It made Li Shimin feel that he was not as good as him.

Li Chunfeng is a chatterbox.

He saw Li Yan not speaking.

He said again: "Today I finally found the Sixth Prince! It's so great!"

"What are you asking me for?"

Li Yan was puzzled.

He didn't let Li Chunfeng get up either. If he wanted to kneel down, he would let him kneel for a while longer.

Any talented person will be some weird people.

Li Chunfeng is no exception. If you let him get up, he might be angry.

So let him go.

"Can you solve the problems in Chapter Nine Arithmetic for me, and how do you solve them? And what are the numbers?..."

Li Chunfeng's questions were very intensive, all about professional issues, and he did not give Li Yan a chance to reply.

At this time, Zhu Shan walked in from outside.

As soon as he heard this, he said, "Li Chunfeng, if you ask this, how should the Sixth Prince respond to you? Which one should I respond to you first?"

Only then did Li Chunfeng realize his negligence.

"Sorry, I was excited for a moment. I wanted to ask these questions too much."

Li Yan said:

"Come on, drink some Siguo Soup first, you're thirsty, right? As for your question, can I reply to you later?"

"Yes, yes, yes, when the Sixth Prince wants to say it, it will be when it will be. I'm waiting."

The five people drank the Siguo Soup.

Cheng Chubi had drunk it, but he still said it was OK.

Fang Yiai took a sip and made a marvelous sound.

I also asked if there was any? Can he drink an extra bowl?

Li Yan said that if you want to drink, you can do it.

As for Li Chunfeng drinking, he was thinking about the problem.

This kind of person gives him such good things a waste, and his heart is simply here.

Li Yan sighed.

I thought to myself, maybe I could teach him something first, and then teach him slowly as to solve the problem later.

For example, Arabic numerals.

So, he said to Li Chunfeng: "Li Chunfeng, come here, I will write a few words to teach you."

Li Chunfeng then put down his bowl and followed him.

Then, Li Yan wrote on paper: 1234567890

Ten Arabic numerals.

Facing such simple and incomprehensible numbers.

Everyone was puzzled.

Other than 1, no one else may know this.

Because 1 is like a horizontal one.

Cheng Chubi pointed at 0 and said: Is this an egg? It’s so round!

If this is an egg, how can 689 be explained?

Li Yan gave him a blank look.

If you don't understand, don't talk nonsense.

He explained: "This is Arabic numeral."

Numbers are the foundation of mathematics. If you want to establish a complete scientific system, simple numbers are essential!

The most suitable number is Arabic numerals.

It has extremely important significance for life, industry, agriculture and other aspects!

With it, it will be more convenient in all aspects of the Tang Dynasty in the future.

I happened to meet Li Chunfeng.

He can suggest in front of Li Shimin.

Top-down publicity from Li Shimin.

It is definitely not possible to do this by yourself. He only provides ideas and gives others all the hard and tired things.

So, just teach him how to do it, everything will be easy.

"Why is it called Arabia? Where is that? Or is it an uncle named Alah?"

Li Chunfeng thought he could be called erudite, but he didn't know that there was a place like Arabia. He even understood it as a person.

Only then did Li Yan realize that it was a bit too disconnected to say this.

So he said, "Somewhere in Dashi, as for the name, it is a name. Later, we will call it the Tang Dynasty numbers, which will explain it better."

"So that's it. Someone has seen the numbers of Dashi in ancient books, but it's not what you painted."
To be continued...