Ding Yi took out a pen and paper, and the pen was a morning pencil. Holding a pencil and explaining to Li Tai for a while, he then said with a serious face: "Your Highness, you can call this arithmetic that I have learned 'mathematics', it is detached from arithmetic, but it is purer and more profound. Mathematics is a broad and profound subject, and the same is true, so I will start with the simplest ones. ”

"Well, so you can get started!" Li Tai didn't really believe it.

Ding Yi didn't care about Li Tai's attitude, picked up a pencil and wrote out ten Arabic numerals from 0 to 9 on the paper and said to Li Tai: "This is used to replace one, two, three, four, five, these numbers, it will be more convenient and concise, this one vertical is 1, this goose is 2......"

Ding Yi taught Li Tai very seriously, and Li Tai also listened very carefully, looking very interesting.

……

At this time, Kong Yingda had already entered the palace and met Li Er!

Li Er took the paper in his hand, walked around reading the poems on the paper, and suddenly turned around and asked, "You said this was made by Ding Yi's kid?" ”

"Your Majesty, this poem is exactly what Ding Yi did, but he ......" Kong Yingda really can't say what Ding Yi did, just like a child playing!

Li Er asked again: "What's the problem with Kong Qing?" ”

"Your Majesty, Na Ding Yi bet with the minister before just to get the minister to agree to him a condition, but after the competition, he put forward the condition, and the minister felt that it was inappropriate and rejected him with poetry and etiquette, so he made this poem." Kong Yingda talked about the gambling with Ding Yi.

Li Er also knew the results of the previous competition, and he was even more curious about Ding Yi now, listening to what he said about mathematics, physics and chemistry, and now he showed it one by one. But he didn't know anything about what happened next, so he asked, "I wonder what conditions he proposed?" ”

"Your Majesty, Your Majesty...... Ding Yi said that he would take half a year off. Because of the poetry, the minister could only grant his request. Kong Yingda replied helplessly.

Li Eryi was anxious when he heard this: "You said he did these things just to ask for leave?" It's half a year! ”

Kong Yingda looked at Li Er, who was a little angry, and replied: "Yes, Ding Yi said that he really can't learn anything in Guozijian, so he has to take half a year off!" ”

"Humph! This arrogant boy really doesn't know what to do! Take half a year off, what kind of place is he the prisoner of this country! Haven't learned much yet! Come on, tell Ding to enter the palace quickly! "Li Er is particularly angry about Ding Yi's actions, and he wants to let him enter the palace to be held accountable.

Kong Yingda saw such a situation, which was very different from his own purpose! Hurriedly bowed down and said: "Your Majesty, don't make a big fuss about this, the minister is here just to ask Your Majesty to let Na Ding Yi be in charge of the doctor of the Guozi Accounting Academy, such a talent, if it is abandoned, it will be a pity!" ”

Li Eryi heard that Kong Yingda wanted Ding Yi to be a doctor of arithmetic, and looked at him curiously for a while: "How can he be virtuous, Kong Qing won't be dizzy!" ”

"Your Majesty, Ding Yi's son is in arithmetic, far surpassing the doctors of the country, and even the ministers are impressed by him." Kong Yingda is not a bad old man.

Li Er came to be interested: "Oh? Even Kong Qing is inferior to Ding Yi in arithmetic? This Ding Yi arithmetic has reached such a point! ”

"Yes, Your Majesty! Ding Yi has a different view from the current arithmetic in arithmetic. Today's answer is even more unique. And in the last question, he just gave the answer, and there was no process, and no one could understand it if he said it. ”

Li Er couldn't help but think of what Ding Yi said the day before yesterday, and at that time he only sighed at what he said about physical chemistry, and only listened to other words. didn't think about it seriously, but now it seems that I have to re-understand this Ding Yi.

"Kong Qing doesn't have to worry, I'll make a decision after I take the test!"

Kong Yingda didn't say anything when he heard this, the emperor said so, so let's do it!

……

Ding Yi reluctantly followed the eunuch to the palace, and Li Tai also followed. He wants to enter the palace to offer filial piety!

Entered the hall and bowed down and said, "Your Majesty, hello! Hole sacrificial wine! ”

"Erchen has seen his father! Confucius! ”

For Ding Yi's special greeting, Li Er felt very novel. There was no special explanation to the eunuchs to teach Ding Yi etiquette.

Seeing that Li Tai was also here, Li Er asked, "Qingque, why did you enter the palace one by one?" ”

"Back to my father, my son asked for math at Shipingbo's house, and he came with him."

Hearing that his son went to ask Ding Yi what mathematics he had, Li Er asked, "Oh? I don't know what you can learn? ”

Li Tai replied: "Erchen has seen a different world in Shipingbo's house, and the foundation of mathematics alone makes Erchen fascinated. Erchen came here this time to implore Emperor Fu to allow Erchen to study mathematics with Shi Pingbo. ”

Ding Yi listened to the big head on the side, you follow me to learn mathematics, so I can't do anything else? Li Er and Kong Yingda glanced at each other, and they both saw surprise in each other's eyes.

"Qingque, have you thought about it? Once the matter has been decided, it cannot be changed! Li Er asked seriously.

Li Tai said sincerely: "Erchen has already thought about it, and he will study mathematics with Shi Pingbo. On weekdays, I will not delay learning the scriptures. ”

When Li Er saw this, he agreed: "Since this is the case, then you can follow Ding Yi to learn mathematics!" Don't delay the scriptures. ”

"Thank you, Father!"

"Your Majesty, although the minister has a lot of things to do on weekdays, he will also do his best to teach His Royal Highness the King of Yue mathematics. Your Majesty, please rest assured! Ding Yi didn't want to be chained, he was going back to Shiping County in a few days, how could he have time to accompany Li Tai.

As soon as Li Er heard this, he thought of Ding Yi's previous incident, and said solemnly: "Hmph! I haven't settled accounts with you yet, what can you do as an unofficial earl! You asked Kong Qing for half a year off before, why? ”

"Your Majesty, you also know that the minister came to Chang'an alone, and the huge family business needs to be maintained by the minister alone. And there is also the physical chemistry that I told you before, do you want me to let this matter go? ”

Kong Yingda and Li Tai didn't know that Li Er and Ding Yi were talking about physical chemistry the night before, and when they heard it, they couldn't help but stretch their ears curiously to listen.

Li Er also remembered the thing that could cure qi diseases, fly to the sky, and kill countless people at once. But he was very unhappy with Ding Yi's coercion between words, and said in a deep voice: "You can study this matter yourself, but you can't forget other things." Change your temperament and do things well, and I won't treat you badly. Kong Qing asked you to go to the Arithmetic Museum to teach arithmetic, so let's go! ”

"Ah, Your Majesty! The minister just asked for leave, can you not go? "Teaching? What the heck?

"You... Dare to ask for leave! ”

"No, Your Majesty, the minister has to go back to Shiping in the near future and take care of the new crops he got before! If it succeeds, it can add a staple food to my Datang, and the yield is not low! "You can only release the killing weapon of corn to avoid teaching!

"What did you say?"

………