Life is nothing more than food, clothing, shelter and transportation, he has no shortage of clothes for the time being, but there is no food and shelter.

Li Su only had ten cents in his arms, and in the early Tang Dynasty, the purchasing power of one penny was quite limited.

Some scholars believe that a colored fine porcelain plate is about 10 wen, an inn stay is 5 wen, and a day of food and lodging is about 25 wen.

Therefore, Li Su's ten cents are only enough to stay in the inn for two days, not including food.

How can I make more money with my gold finger?

He thought of a solution in an instant.

Sell poetry!

He can search for classics from various dynasties in an instant.

Write it down and you can sell it.

But where to sell it?

Outside the country's prison! There are more nobles and more rich people.

In this way, we are not afraid of no sales, so as to maximize the benefits!

Selling poetry requires pen, ink and paper, which is too expensive for him to afford, but pen and ink can. As for the paper, find another way.

So, he went to the place where he sold his pen and paper.

He didn't know that he had just walked on his front foot, but there were hundreds of people on his back foot surrounding a middle-aged man coming towards the study, which was very lively.

When they entered the library.

The man saluted to the crowd.

"Everyone is very loving, and I, Li Chunfeng, am grateful. It is also His Majesty's hope to be able to teach good seedlings! You have to study hard! ”

It turned out that this person was Li Chunfeng, who was born with a Dao bone fairy style, and he was full of energy.

He sat above the podium, and the previous screen had been removed.

There are a lot of people sitting down there.

"Li Zhenren is admirable for the people and the country!"

The speaker is the master of the study, called Chen Hong!

Li Chunfeng said: "Where is it, why don't we start now?" ”

The crowd said yes, and it fell silent.

Li Chunfeng was treated like a moon by the stars, which made him smile.

Facing the hundreds of students below, he opened the nine-chapter arithmetic volume.

I don't know if I don't see it, but I was shocked when I saw it.

His gaze remained unwavering, staring at the book.

And the more I looked, the more shocked I became.

He muttered, "This ...... Who did it!? ”

Everyone was puzzled, and Chen Hong seemed to have noticed that something was wrong.

He stepped forward and asked, "Li Zhenren, what's wrong?" Isn't this book of nine chapters of arithmetic correct? Why don't I have someone change it? ”

Then I saw the handwriting on the book.

The whole book is written to the full.

I couldn't help but be furious.

"Who did it? Who wrote on the book? Who is it? ”

As soon as these words came out, everyone panicked.

After all, they just sorted it out inside, and no one can get rid of it.

And these are the only children who can enter the school.

Maybe it's a prank.

That Chen Hong was about to get angry.

Li Chunfeng said:

"Wizard, what a genius! It was able to solve all the answers to all the questions, and it also provided such a novel way to solve the problems. I, Li, have lived in vain for so long, and I didn't even know that there was such a way to solve it in this world! I'm so ashamed! ”

This is said in a fog.

What's going on?

Could it be that someone touched the book and solved the problem on it?

So it made Li Chunfeng feel surprised.

What a genius that is!

Then, he said, "Chen Hong, are you deliberately teasing me?" Did you deliberately embarrass me? ”

These words frightened Chen Hong and hurriedly said: "Li Zhenren, how dare we? ”

"And how do you explain that?"

"This, I don't know, I don't know who wrote the answer on it, I can swear to God, this is not our doing!"

His expression was sincere, not at all like a liar.

That being said, it's not intentional.

When Li Chunfeng heard this, his eyes were full of fire.

"Whoever can answer this must be a genius! You have to find out who did it! I'm going to meet Your Majesty! ”

Li Chunfeng said excitedly.

The students at the bottom were all cornered.

So what about today's lesson?

Didn't you say that you want to teach you nine chapters of arithmetic?

Why is this happening?

Chen Hong stepped forward and said, "Li Zhenren, this student is still here, why don't you finish the class first and then go?" ”

Everyone also looked at him, hoping that he could finish the lecture before leaving.

However, he said:

"No, it's not a trivial matter at this time, I must meet Your Majesty, but I can't lose such a talent. I lost my company, and as for the class, I will teach it another day. Leave! ”

After finishing, Li Chunfeng directly took the book and walked out of the library, leaving more than 100 people there to be sluggish.

"Hey, who the hell is this, and why did you give the answer at this time?"

Chen Hong sighed.

And Li Chunfeng went directly to Taiji Palace.

He walked windily and was very eager to inform Li Shimin of the news.

Li Shimin is still sullen because of what happened to Li Su yesterday.

Seeing Li Chunfeng so flustered, he couldn't help but get nervous.

It can't be what happened, right?

You must know that Li Chunfeng is an astronomer, and some celestial phenomena have to be observed by him.

As soon as there is something bad, he will definitely come to him as soon as possible.

Don't......

"Your Majesty!"

"Why is Aiqing so flustered?"

"Your Majesty, all the topics of the nine chapters of arithmetic have been calculated."

"Wasn't the title of the nine chapters of arithmetic already calculated? What's so panicked about this? ”

"Your Majesty, the minister is wrong, it is the algorithm of the nine chapters of arithmetic that has been improved, and it only takes three or four steps to completely solve the problem!"

That's very important when it comes to clear calculations.

Because it's so important, it's used in marching battles, it's used in astrological signs, and crucially, it's even more important for the development of science and technology.

Therefore, in the Tang Imperial Examination, it will be a separate discipline.

"What did you say?"

Li Shimin was very surprised.

He also learned Ming arithmetic, and knew that the problems of nine arithmetic problems could not be written with one foot or two feet of cloth, and sometimes it even took ten feet of cloth to write down the answers.

"Your Majesty, please look!"

Li Chunfeng was excited, and he presented the book.

The eunuch on the side hurriedly put away the things and handed them over to Li Shimin to see.

After Li Shimin saw it, the whole person was fixed there.

"This ...... What kind of text is this? ”

"Your Majesty, this is the text of Da Shi, as far as the minister knows, it was introduced to the Central Plains as early as the Three Kingdoms period."

The so-called big food is the ancient name of the Arab country.

Arabic numerals were invented early, and they were introduced to the Central Plains relatively early, but they were not developed.

Li Chunfeng actually understands these figures, which can be said to be very deep.

"You understand the relationship?"

Li Chunfeng behaved a little unnaturally.

"The minister still knows a little about some symbols, but this person can simplify the complex, and this kind of realm must be contributed to for thirty years! If this person can be found, it will definitely make Datang's clear calculation to a higher level, and Datang's strength will be accelerated. ”

If he knew that the other party was just a teenager, the expression must be very funny.

"This handwriting ......"

Li Shimin seemed to see that the handwriting was somewhat familiar.

Li Chunfeng said again: "This person's handwriting is vigorous, and he can't do it for ten years. ”

"You don't have to look for it, I know who this person is!"

Li Shimin said firmly.

This made Li Chunfeng a little shocked when he heard it.

"Your Majesty really knows who it is?"

"This is the handwriting of the child!"

Li Su's handwriting was taught by him, and some of this child's handwriting is very distinctive, and he can see it at a glance.

What the?

"What does Your Majesty mean?"

"This handwriting is the handwriting of my sixth son, Li Su!"

How could this be?

"Then can you ask the six princes to come out and solve your doubts?"

Li Chunfeng was overjoyed.

If you want Li Su to come out, it will be good for the future of Datang!

"Don't mention it! Go down and study his solution. As for finding him, let's talk about it later! ”

Why? Can't you just ask? To go around in such a big circle? Obviously, he didn't know about last night's events yet.

"Your Majesty, why?"

"Don't ask why, you just research!"

Seeing that Li Shimin seemed to be angry, Li Chunfeng didn't dare to ask again.

You can only respond to the "Yes!" ”

Li Shimin's face became very strange.

As soon as Li Su was driven out, he did such a shocking thing.

Is it all as he says?

Shouldn't he marry Princess Changle?

I don't understand, I don't know, I can't.

"Go down!"

"Yes!"

Li Chunfeng retreated with doubts, and he thought in his heart that he must find the sixth prince and help him solve his doubts. No matter what, you need to find a way, even if you worship him as a teacher.

As for Li Shimin, he remembered Li Su's words when he left at this time.

That is, he shouted:

"Come on, quickly send people to Shandong and Henan to check the river, and report immediately if there is a situation!"

"Yes!"