As early as the Spring and Autumn Period and the Warring States Period, the great ancient Chinese invented the multiplication formula, but there are really few people who dare to say that they are proficient, and Cao Cao is also a high-level intellectual, so he thought about it a little;

Said: "I am six years old Chinese New Year's Eve this year, and my youngest son Cao Pi is seven times younger than me and one year old, how old is my son Cao Pi this year?" ”

Yah! It is worthy of Cao Cao, who has a strong reverse thinking, and was stunned to give Li Yu a division problem, you must know that there is no such thing as division at this time, although division can be regarded as a subsidiary derivative of multiplication, but it was not named at that time;

Li Yu said without hesitation: "Cao Pi is five years old this year, right?" ”

Cao Cao was stunned for a moment, and the slapper snorted: "Judging from the speed of Mr. counting, Mr. is really proficient in counting, so Mr. will also test me!" ”

No way! Want to show it off? Li Yu pursed his lips, looked at the meat in his hand and said, "I eat a pound of meat today, a pound tomorrow, day after day, how much will I eat in a month?" ”

"Sir treat me with sincerity!" , Cao Cao frowned dissatisfied;

Li Yu knew that he couldn't make the big boss angry, so he said: "There is an animal named in the southern country: elephant! It's two feet high, and its weight doesn't know how much it is..."Is there really such a monster? Cao Ren interrupted Li Yu's words in surprise;

Li Yu shouted angrily: "You are not allowed to speak at will above the school!" Raise your hand for something...", uh... Li Yu is embarrassed··· This is his professional habit, and Cao Ren, who was frightened, shrank his neck, and Li Yu smiled embarrassedly: "Professional habits... I'm sorry..."

"Sir continue!" , Cao Ren returned the salute and didn't care;

"If you put some elephants and horses together, their average weight is 8,000 catties, and it is known that there are 50 elephants, and the average weight of elephants is 10,000 catties, and the average weight of horses is 3,000 catties, how many horses are there?", well, this is a question at the junior high school level;

Cao Cao was a little dazed, he picked up the pen and wrote the inscription made by Li Yu on the bamboo slips, thinking, there was no movement for a long time, he didn't know how to calculate;

"Ahem, ahem! If you are sick under the body, you will retire first, Cao Gong! Count slowly! Li Yu said hello, at this time, Cao Cao was not as old and spicy as he was later, and he still cared about some things, and he was competitive! It's the nature of a man! casually beckoned a subordinate and took Li Yu away, and everyone who was immersed in the magical number problem did not notice it.

Only Xu Chu wanted to escort Li Yu, but Li Yu waved his hand to stop him, nodded his chest, and signaled him not to forget what he said and the responsibility he shouldered, Li Yu said to him before he came, from now on, he must not recognize his six relatives, even if it is himself, he cannot let himself enter his room without Cao Cao's permission, and must follow Cao Cao every step of the way;

After sleeping for more than an hour, nearly three hours later, Li Yu was shaken awake, and when he opened his eyes, he saw that it was Le Jin; "Oh? General Le, what's the matter? "The lord told you to come with me," "Hmm! ”

As soon as he entered the room, Cao Cao saw that Li Yu was stunned for a moment, and he couldn't wait to say, "Hehe, there are twenty horses!" ”

Glancing at Cao Cao suspiciously, Li Yu took a few steps forward, casually took an unused bamboo slip, picked up a brush and drew a few formulas, looked at the answer obtained, and said lightly, "Yes!" ”

I don't want Cao Cao to be dumbfounded, and the other generals are also dumbfounded! Cao Cao spent more than an hour, used countless bamboo slips, and calculated countless times before and after the answer, this guy actually drew a few symbols that he couldn't understand and had already come to the result, Cao Cao looked at Li Yu a little unwillingly, but he couldn't see anything wrong.

Li Yu naturally saw the drafts all over the ground, and said with a little amusement, "You are not ......", Cao Cao's face suddenly became hot.

Nearly 2,000 years of culture! Li Yu felt an indescribable pride in his heart at the moment, glanced at Cao Cao, who was ashamed, and said secretly in his heart, boss, I'm sorry, I just want to eat

……

"Meng De has something unclear, please give me advice!" Cao Cao loves talents, which is not denied either in the official history or in the romance, at this time he claimed his own expression to Li Yu, obviously Li Yu had a high status in his heart;

"Cao Gong, please speak!" Li Yu is in a very good mood now, and it seems that he will occupy an important position in his heart.

"Meng De's question just now, I faintly feel an inexplicable connection, but I always don't know, please give me advice on how to solve this problem...... Cao Cao stood up and saluted Li Yu as a disciple in the eyes of Xiahou Dun and several people who couldn't believe it.

Li Yu hurriedly helped Cao Cao up, "Kill me!" But I was very proud in my heart! So it was explained;

"Cao Gong is right, you see ......" Li Yu picked up the pen, took a bamboo slip and wrote as he spoke, "The weight of the elephant is higher than the average number of 2,000 catties, the weight of the horse is lower than the average of 5,000 catties, a total of 50 elephants, that is, more than 100,000 catties, with the method of making up for more and less, you can find out that the number of horses is ......"

"Is that so?" Cao Cao's eyes lit up, and he snatched Li Yu's pen and wrote on the paper. Cut! I'm not done yet! Li Yu smashed it, smashed it, he was in a bit unhappy, and finally let me show off, but you kid didn't want to?

"Sure enough!" Cao Cao exclaimed in amazement, looking at Li Yu's eyes a little burning. This is about the same, Li Yu is very satisfied, "divide the number of catties with the average value of the elephant by the number of horses below the average......"

"Wait! Dividing! Cao Cao was shocked in his heart, "What is dividing by ......", "uh..." Li Yu was speechless for a while, "This ......" He suddenly woke up, what was there at this time...... Division;

"Except?" Cao Cao muttered, looking at Li Yu who stopped abruptly with a strange expression.

...... "Don't look at me anymore, I'm not good at masculinity, Li Yu was creepy by Cao Cao, and that kind of eyes full of curiosity deeply burned Li Yu's face.

"Alas......" Cao Cao sighed, he only now understood that he had been so out of shape just now, this Li Yu ...... No, the technology mastered by Mr. Huaide is absolutely unknown to no one in the world, and he even rashly asked, not a close relative, if he can pass it on?

Cao Cao is Cao Cao after all, and he laughed in a blink of an eye: "Sir, great talent!" Meng De was deeply admired! "Shame! Ashamed! That, boss! It's not too early, ha......", Li Yu saw that these people were staring at him deadly, and he was embarrassed to sloppy.

"What is a boss?" Cao Cao couldn't help but ask curiously, "Ah, this is, what about you, Gong Cao, just like the big landlord, and I, I am the long-term worker, doesn't the landlord always reprimand the long-term worker with a straight face?" That's what it looks like, the boss is the person with the boss's face! ”

"Hahaha!" , Li Yu's words were that Xiahou Dun and the others couldn't help laughing. "Sir......" Cao Cao's words suddenly made Cao Ren and the others dare not laugh in shock. Forehead...... Something? ”

Cao Cao frowned, obviously struggling in his heart, but in the end he still made a decision, he walked up to Li Yu and actually made a big bow to Li Yu.

"Big brother...... "The two brothers Xiahou and the two Cao brothers shouted in a lost voice, this is the gift of disciples! If the disciple's salute just now just said that it represented Cao Cao's respect, and the salute here almost confirmed Li Yu's status! Teacher!

Cao Cao ignored the two pairs of brothers, and just looked at Li Yu with burning eyes, "Meng De is willing to give Mr. a disciple ceremony, I hope Mr. will teach me this technique......" Li Yu opened his mouth, he didn't expect that he would actually be Cao Cao's teacher! He was stunned, and after a moment of astonishment;

"Cao Gong can't!" Li Yu hurriedly helped Cao Cao up, I'll fuck! Didn't you give me eye medicine? You see Xiahou Xuan, Xiahou Yuan, Cao Ren, and Cao Hong are about to kill me with their eyes: "Serving the boss, I dare not hide anything, and I am not a person who cherishes myself!" Truth be told, this is my own figurative division, which is actually reverse multiplication! ”

At this time, Li Yu secretly prayed in his heart to all the sages to forgive me for my shamelessness! To survive! "Figured it out yourself!" , Cao Cao couldn't help but wonder.

"Exactly! The teacher has taught in Xujiazhuang, and many children will do it! Xu Chu interjected angrily, "Then you will too?" "Uh... I'm blunt... Unlearned! In the face of Cao Ren's question, Xu Chu replied awkwardly;

"That's it!" Li Yu picked up a bamboo slip, picked up a brush, drew a few symbols, and explained the Arabic numerals and the application of these symbols.

"Sir, great talent! Meng De admires, from today onwards, this Arabic numeral will be added to your name, and Li's arithmetic should also be famous all over the world, I would like to worship Mr. as the main book, I don't know if Mr. can give in! "Cao Cao.

"Don't dare to disobey what you want!" Li Yu immediately bowed down, and the words were all said to be this, and if he didn't give face, beware of Boss Cao clicking himself off with a knife: "I've seen the lord!" "Hahaha! I have to be helped by my husband, I am really fortunate to have three lives, come to someone, have a banquet, and welcome the arrival of Mr.! ”

Although the wine of the Han Dynasty was like horse urine, Li Yu still drank a lot, and Cao Cao also toasted with everyone during the banquet, especially Xiahoudun, who was enthusiastic, not to mention! When Li Yu walked back in a daze.

Cao Cao didn't care about Xu Chu's existence at all, and said to Xiahoudun, Xiahou Yuan, Cao Ren, and Cao Hong: "Look at Mr. Huaide!" ”

"What a rare talent in the world! Li's calculations are indeed remarkable, and Arabic numerals have also reduced the difficulty of calculations, and it will be much more convenient to fight on the march and count grain and grass in the future! Be sure to listen to him when you have time! By this time, Xiahoudun had already thrown himself to the ground for Li Yu's admiration, and naturally he did not hesitate to praise it!

"Hahaha! Yuan Rang, don't you blame him for scolding you? Cao Cao couldn't help but joke. Uh, this... Don't mention it at this point! Xiahoudun touched his nose.

"Big brother, although Mr. Li Yu and Mr. Huaide are from poor families, they are extremely talented, and the fact that they are suitable for their talents can be seen that they are talented! Congratulations, big brother! Thanks to this, we can help! Cao Ren, this kid was praised by Li Yu and said that he was comfortable, and he still remembers Li Yu's goodness!

"Knowledgeable, bold, and without the sour energy of the literati, very good! With his help, big brother can be expected! Xiahou Yuan;

"Hahaha, yes, I said that a fierce general is better than 100,000 gold and silver, but I haven't said a word later!" , Cao Cao proudly sold Guanzi. Cao Hong was really interested and immediately said, "Oh? What is it? ”

"A great talent is better than a thousand troops!";