Thanks to Wang Jie's Annie, 173178 and other book friends for their tips and support, and thank all the book friends who read.

At noon, after the reception banquet was dispersed, Li You, Murong Ling and others returned to the Qi Palace.

As soon as I walked to the door, I saw an official wearing a Taoist symbol standing at the door, which turned out to be Li Chunfeng.

Since Li You easily solved the problem he had carefully researched, Li Chunfeng was itching and asked Li You for math problems from time to time.

In the original time and space, Li You had enough school, and he was tired of doing homework. He is also an undergraduate student, and now he wants to talk to Li Chunfeng about elementary school mathematics, and he is not interested at all.

So, he casually told Li Chunfeng about it, and he didn't explain it too clearly, so he asked him to go back and ponder it, saving him the entanglement of getting to the bottom of it.

Before Li You left Chang'an, Li You told him about the one-dimensional equation, which Li Chunfeng used to calculate problems such as chickens and rabbits in the same cage, which was handy and excited for a long time, so he waited for Li You to come back and discuss it further.

Li Chunfeng's level was not enough, he did not participate in the early dynasty, and he didn't know Murong Ling and Hao Lianbote, he stepped forward and arched his hand, and after saluting Li You, he nodded at Murong Ling and the others, and asked Li You directly:

"Your Highness, the minister has studied the one-dimensional equation you taught the minister, and I find it very useful, and the minister has drawn inferences from one case and found that many problems can be solved. The minister also has a ......."

"Daochang Li." Li You interrupted him directly. He said, "I have a guest today, you go back first, and talk about it in a few days." He wanted to send Li Chunfeng away.

"Wait a minute, what is a one-dimensional equation?" Murong Ling was curious and couldn't help but ask.

At this time, Li Chunfeng found his bosom friend, and he asked, "Your Highness, may I ask who this little lady is?" ”

Li You introduced: "This is Li Chunfeng. This is Murong Ling, the newly canonized county lord of Yinzhou by the imperial court, and this is Hao Lianbot, the prime minister of Tuyuhunzuo. ”

Li Chunfeng arched his hand and said, "The minister has seen the Lord of Murong. Then, he said directly: "County Lord, this unary equation is very useful, you see, the minister gave you a problem, a cage ......"

He took out his proud work in the same cage as the chicken and rabbit again.

Murong Ling was immediately attracted by this topic, and began to count his fingers with his eyes wide.

Li Chunfeng looked at Murong Ling and smiled proudly.

Li You saw that it was not a problem to stand at the door, so he said: "Sister, Lord Hao Lian, Daochang Li, let's go to the house." ”

Walking on the road, Murong Ling didn't say a word, and kept pondering.

Li Chunfeng said in a sneering voice: "County Lord, this question is one of the most difficult questions in Datang. Except for His Royal Highness the King of Qi, that is, the ministers can solve it.

You calculate carefully, calculate carefully, if you can calculate it, you will definitely be the first arithmetic master in Tuyuhun. ”

Murong Ling was dizzy, and when he heard Li Chunfeng chattering on the side, he glared and said, "People are calculating, don't keep chattering here and interrupt my train of thought." ”

At this time, Changshi Tian Min came over and said, "Your Highness, the minister wants to report to you about your financial situation after you leave. ”

Li You said to Murong Ling: "It's just right, I have something to do, you and Daochang Li are slowly calculating." ”

Murong Ling waved his hand, signaling him to go and busy with himself, lowering his head and continuing to count as he walked.

Tian Min reported to Li You on the income and expenditure of all industries and commerce, and in general, the situation was good. But this time to support Murong Bo, Li You borrowed money from Hamid, and the money had to be repaid.

This money was given by Li You for the imperial court, and it is said that the imperial court should pay for it. But Li Shimin lied and made a clear statement, saying that the court had no money, and let Li You figure out a way by himself. I have to find a way to earn this large amount of money.

Seeing Tian Min's worried look, Li You smiled and said, "It's okay, isn't it just more than a million yuan, it's a little meaning." Alright, you don't have to worry about it. ”

With that, he walked in the direction of the guest room.

Tian Min looked at Li You's back, still with a sad face. Xin said: "Selling a loaf of bread only earns two cents, which is more than one million!" His Highness's heart is really too big. ”

Li You walked to the door of the guest room, and heard Li Chunfeng showing off inside: "County Lord, you can't calculate it like this, you look at my algorithm, 25 chickens, 18 rabbits, you see, right." ”

Li You went in and saw that there were several pieces of paper in front of Murong Ling, and the messy writing on them was the same as when Quan Wanji counted this.

Li Chunfeng made an equation and was showing it.

Hao Lianbot was thinking with his beard twisted in his hand, the magpie was staring at the side, and the white tiger was also looking with his neck stretched.

Seeing Li You come in, Murong Ling said, "Li You, I want to learn this arithmetic, you let Daoist Li teach me." ”

Li Chunfeng is a man of the Tao and will not be greedy for the merits of others. He hurriedly said: "This is not good, this little thing of the minister's association was also taught to the minister by His Royal Highness the King of Qi." Your Royal Highness the County Lord, you should ask His Royal Highness the King of Qi to come down and teach. ”

After Li You sat down, he saw that they were all staring at him, and suddenly remembered a joke in Zhao Benshan's sketch that fooled Fan Wei, and said with a smile: "Do you all want to learn arithmetic?" ”

Everyone nodded in unison.

Li You smiled: "In this way, I will come up with a question to test you, the easiest." If you can answer it, it means that you are wise, and then you can teach. ”

Li Chunfeng immediately came to his senses and said, "Your Highness, please ask questions." ”

Li You smiled: "Listen, under what circumstances does one plus one not equal two?" ”

Murong Ling preemptively said: "Li You, you're not right, you're wrong, you're wrong, one plus one is equal to two, and under any circumstance, it's also equal to two." ”

Li Chunfeng also said: "Your Highness, I'm afraid you are wrong, one plus one equals two." ”

Li You looked at the magpie and the white tiger, and they also nodded affirmatively, proving that the prince was wrong.

Hao Lianbot is a cultivated person, and he was embarrassed to hit Li You, so he didn't speak. But that expression also showed the attitude - Li You was wrong.

Murong Ling pursed his lips and said, "At your level, can you still teach people?" I'd better ask Daoist Li to teach. ”

Li You asked, "Are you sure that one plus one equals two in any case?" ”

Everyone nodded in unison.

Murong Ling said directly: "You are wrong, stupid to death." ”

Li You smiled: "Let me tell you, there is a situation where one plus one is not equal to two - in the case of miscalculation, it is not equal to two!" ”

"Poof", Hao Lianbot just took a sip of tea and squirted it out.

"Hahahaha, cluck", everyone laughed in unison.

Li Chunfeng coughed with laughter, Baihu rubbed his stomach with laughter, and the magpie's tears flowed out.

Murong Ling giggled, and the powder fist hit Li You's arm directly.

After the laughter, Li You began to explain the basics of mathematics to them.

Li Chunfeng listened and recorded.

Hao Lianbot also took a pen and took notes seriously. He said: "Your Highness, please tell the minister more, and the minister will bring it back to Tuyuhun and teach it to the people there." ”

Li Chunfeng also said: "Yes, Your Highness, can you compile a textbook, this arithmetic knowledge is too useful, we need it in Datang." ”

Li You had already found out. People in this era have weak mathematical knowledge and are often troubled by simple mathematical problems.

Not to mention the ordinary people, even the officials in charge of statistics in the household department are extremely inefficient. A modern person can be equal to the work efficiency of dozens of officials in the household department without the help of a computer, just by relying on pen calculations.

He said, "Okay, let's write a textbook for the popularization of arithmetic together." ”

The Dragon Boat Festival has finally arrived, and the much-anticipated poetry competition has begun.