Otaku Engineer in Great Tang Dynasty

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Guozijian, in the School of Mathematics.

Everyone focused their attention on Ke Shiqing, waiting for him to come up with a question.

"The student wants to ask the gentleman to solve a problem within a quarter of an hour. The problem is one thousand three hundred fifty-two times two thousand seven hundred and eighty-one. What is the result?"

Ke Shiqing thought about it and gave a multiplication problem with huge numbers.

"Hey~, with such a large number, it is estimated that it will take a day to calculate it?"

"Who says it's not, this Ke Shiqing's question is too ruthless."

............

As early as the pre-Qin period, people learned to use arithmetic chips for counting and multiplication. First place the multiplier on the top, then place the multiplicand on the bottom, and align the last digit of the upper number with the first digit of the lower number. In the order to the right, multiply the first digit of the upper number by the lower number, place the multiplied product in the middle of the upper and lower numbers, then remove the first digit of the upper number, move the lower number one place to the right, and multiply the lower number by the second digit of the upper number. Ladies and gentlemen, add the product in the middle and drop the second digit from the top. Until the upper number is used up, the middle number is the result.

Ke Shiqing's question, if he used arithmetic to calculate it, he might have to fiddle with it for a day.

Kong Yingda and Xu Hongzhi both looked solemn and frowned after listening to the question.

Li Zexuan smiled lightly and said indifferently, "Hehe, what's so difficult, Ke Shiqing, you don't need me to do this problem at all, my eldest disciple can do it for you, iron boy, come up and solve this problem on the blackboard!"

This is the multiplication of two four-digit numbers. With Li Zexuan's current strong mental power, he can deduce the answer directly in his mind without having to do it at all.

"Yes, Master!"

Tie Dan walked from his seat to the blackboard, picked up a piece of chalk, and began to calculate using the elementary school math knowledge given to him by Li Zexuan.

He and Laner had discovered the novelty of chalk on the blackboard last night, but they had been doodling on it for a long time, so it was not difficult for him to write on the blackboard now.

"Hey~ did I hear it right? Mr. even said that this question is easy?"

"Can his apprentice really do it?"

"Too arrogant!"

Ke Shiqing also frowned, secretly saying that this new gentleman is really big. Immediately, he stopped talking, and concentrated on looking at the iron egg above to solve the problem, but just by this look, he was stunned.

What is this black plank? Why can I write on it? Why is the handwriting so clear? Can be seen from so far away.

Also, what kind of words did the guy called Tie Dan write? How does it look like a ghost character?

The rest of the people also noticed something was wrong, and they whispered and talked in a low voice.

"This black board is so amazing that it can be used for writing. In this way, when Mr. Lectures in the future, we can listen and read, and it is more convenient to take notes!"

"Yeah, I used to talk so fast that I couldn't remember it at all. With this thing, I can definitely learn better. I now hope that my husband can beat Ke Shiqing, so that he doesn't have to leave."

"Hey, look at what that kid wrote? Why don't I know it?"

"Uh, I don't know either, why does it look like a ghost talisman!"

..........

When Kong Yingda saw Tie Dan writing and drawing on the blackboard, he instantly understood what Li Zexuan had said outside the classroom that would make students do more with less. I can see that the blackboard teaching is many times better than when he was teaching in front of the book before.

Kong Yingda was extremely excited, secretly thinking that the Guozijian must equip all the schoolhouses with a set, and he had to ask Li Zexuan for a batch.

When he looked at the words written by Tie Dan, he couldn't help frowning, thinking: Could it be that Li Zexuan, the master, has not taught this child to write before? How to write crookedly, can't recognize it at all!

Xu Hongzhi had seen this kind of word last time, but at the moment he was still shocked. He didn't expect that Li Zexuan would have the confidence to use his strange words to calculate such a huge multiplication problem.

Time passed by minute by minute, about half a quarter of an hour passed, which is almost equivalent to four or five minutes in modern times. Iron Egg left seven lines of Arabic numerals on the blackboard. The result has been calculated, and he is still a little worried. , checked it again, and found that the results were the same twice, so he turned around and said to Li Zexuan:

"Master, the iron egg has figured it out, and the answer is 3,759,912."

After listening to Li Zexuan, he nodded slightly. He had calculated in his heart that it was indeed the answer.

"Mumble..."

There was a drooling voice below. Even though they didn't know whether the result was right or not, they were frightened by such a huge number. They really couldn't understand how such a huge number could be calculated in such a short period of time. from.

"Well, iron egg, sit back first! Ke Shiqing, what's up, is this answer correct?"

Li Zexuan smiled and asked Ke Shiqing.

Ke Shiqing was shocked and couldn't believe it after hearing Tie Dan's answer. When he heard Li Zexuan ask him, he woke up and bowed deeply to Li Zexuan, saying:

"Mr. Hui, the answer to this question is indeed this, but the students really don't understand, why the question that I only calculated for a day before, the iron egg is actually half an hour.

The clock can figure it out. Ask Mr. to pass on my efficient algorithm, students are willing to pay any price! "

As soon as Ke Shiqing finished speaking, the hall exploded.

"Hey~ That's right!"

"It's incredible. Multiplying such a huge number, it can be calculated in less than half a quarter of an hour. Is our new gentleman a reincarnation of an immortal? How can the apprentice of the teaching be so powerful!"

"It must be the reincarnation of an immortal. That's great. I can attend lectures in the teacher's class in the future, and I can also learn this magical algorithm!"

"If I can learn this algorithm, I will definitely be able to enter the four academies next year!"

"Even the senior brothers from the Four Gate Academy are not so powerful!"

 …

Both Kong Yingda and Xu Hongzhi widened their eyes and almost pulled their beards off.

Li Zexuan pressed his hands towards the void below, and everyone immediately became quiet, and all turned their attention to him.

"Shiqing, have you seen these seven lines of characters on the blackboard? These oddly shaped small characters are a simpler counting method that I invented. As for the calculation process, it is also very simple, and I will explain it to you in the future. Then Now, is there anyone else you want to ask questions? If you want to ask questions, hurry up!"

Li Zexuan took a branch, which he casually folded in the Guozijian before he came. He used the branch to point to the traces of the calculation left by the iron egg on the blackboard, and gave Ke Shiqing a general explanation.

Arabic numerals were originally invented by ancient Indians. Later, after 700 AD, the Arabs conquered the Punjab region and arrested a mathematician in northern India. The Indian counting methods and mathematical symbols were learned by the Arabs. And spread to Europe, and then modernized by Europeans.

During the Zhenguan period, there were no Arabic numerals in the whole world, and Li Zexuan only thought of such a thing later, so it is not wrong for him to say that this thing was invented by himself at this moment.

Ke Shiqing was very excited when he heard that he would have the opportunity to learn this advanced algorithm from Li Zexuan in the future. He respectfully bowed to Li Zexuan, and said, "Thank you, sir, for your teaching, the students have no doubts, sir. The achievement in the field of arithmetic is beyond the reach of students!"

Kong Yingda and Xu Hongzhi looked at each other, and both could see a trace of horror in the other's eyes. It was easy to say that they created their own faction, but it was easier said than done to construct a complete and rigorous theoretical system.

Throughout the ages, those who have been able to create their own faction and become their own family are all great masters and even great sages! For example, Confucius, Laozi and others. If Li Zexuan's self-created theory can stand up to scrutiny, I am afraid that he will become a saint in the future!

Is this the prosperous world, the saints come out?

Li Zexuan was complimented a little by Ke Shiqing, he waved his hand and smiled: "Okay, if you have any questions, ask them as soon as possible. If there are no problems, then I will start the official class!"

The rest of the students looked at each other in dismay. Li Zexuan's apprentices were so powerful, how could they dare to go out and abuse them again! So, Li Zexuan waited for a long time and no one came up to ask questions. He was about to start the official class when he heard a loud voice from outside the house.

"Haha, this king has a question, please ask Dr. Li to explain!"

…………

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