Imperial College, School of Mathematics.
Everyone's attention was on Ke Shiqing, waiting for him to give the question.
"I would like to ask you to solve a question in 15 minutes. The question is 1352 multiplied by 2781. What is the result?"
Ke Shiqing thought for a moment and gave a multiplication question with a huge number.
"Wow, such a huge number. It would take a whole day to solve it, right?"
"That's right. Ke Shiqing's question is too ruthless."
.....
As early as the Pre-Qin Dynasty, people learned to count and multiply with arithmetic. First put the multiplier above, then put the multiplicand below, and align the last digit of the upper digit with the first digit of the lower digit. From left to right, use the first digit of the upper digit to multiply the lower digit, put the product in the middle of the two numbers, then remove the first digit of the upper digit, move the lower digit one to the right, multiply the second digit of the lower digit, add the product in the middle, and remove the second digit of the upper digit. Until the upper digit is used up, the middle digit is the result.
If Ke Shiqing's question were to be solved with arithmetic, it might take a whole day.
Kong Yingda and Xu Hongzhi listened to the question with a dignified face and frowned.
Li Zexuan smiled casually and said, "Haha, it's not difficult. Ke Shiqing, you don't need me to solve this question. My eldest disciple can do it for you. Iron Egg, come up and solve this question on the blackboard!"
This was the multiplication of two four-digit numbers. With Li Zexuan's strong spiritual power, he didn't need to do it at all. He could directly deduce the answer in his mind. It was not challenging at all. It was better to let Iron Egg practice.
"Yes, Master!"
Iron Egg walked from his seat to the blackboard, picked up a piece of chalk, and began to calculate with the elementary math knowledge Li Zexuan taught him.
He and Lan 'er found the chalk on the blackboard last night. He had been scribbling on it for a long time, so it was not difficult for him to write on the blackboard now.
"Wow, did I hear it wrong? Teacher said this question is easy? "
"Can his disciple really do it?"
"Too arrogant!"
Ke Shiqing also frowned and secretly thought that this new mister was really arrogant. At that moment, he stopped talking and focused on the Iron Egg to solve the problem. However, he was dumbfounded by what he saw.
What is this black wooden board? Why was he able to write on it? Why was the handwriting so clear? He could see it from so far away.
Also, that guy called Iron Egg, what kind of words did he write? Why does it look like scribbles?
The rest of the people also noticed that something was wrong and started whispering to each other.
"This black board is so magical. It can actually be used to write. In this way, when Teacher teaches in the future, won't we be able to listen to and read at the same time? Moreover, it will be more convenient to take notes!"
"That's right. In the past, Sir spoke too fast and I couldn't remember everything. With this, I'll definitely be able to learn better. Now, I hope that you can defeat Ke Shiqing, so that you won't have to leave. "
"Hey, look at what that kid wrote. How come I don't know him? "
"Eh, I don't know either. Why does it look like scribbles?"
.....
When Kong Yingda saw Bruiser scribbling on the blackboard, he instantly understood what Li Zexuan was talking about outside the classroom. He had been teaching for many years, so he could tell at a glance that teaching on the blackboard was much more effective than teaching in front of a book. Kong Yingda had been teaching for many years, so he could tell at a glance that teaching on the blackboard was much more effective than teaching in front of books.
Kong Yingda was extremely excited. He thought to himself that such a good thing should be given to all the teaching rooms in the Directorate. He had to ask Li Zexuan for a batch later.
When he looked at Iron Egg's handwriting, he could not help but frown. He thought to himself, "Did Li Zexuan not teach this kid to write before? Why is his handwriting so crooked? I can't recognize it at all! "
Xu Hongzhi had seen this kind of handwriting before, but he was still shocked at this moment. He did not expect Li Zexuan to be so confident that he could calculate such a huge multiplication problem with his strange handwriting.
Time ticked by. After about seven minutes, which was equivalent to four or five minutes in modern times, Bruiser left seven lines of Arabic numerals on the blackboard. He had already calculated the result, but he was still a little worried. He checked it again and found that the result was the same. He then turned to Li Zexuan and said, "Li Zexuan,
"Master, Iron Egg has calculated. The answer is 3,759,912."
Li Zexuan nodded slightly. He had calculated it in his mind and it was indeed the answer.
"Gulp …"
The sound of saliva swallowing could be heard. Even though they did not know whether the result was correct or not, they were shocked by such a huge number. They really could not understand how Iron Egg could calculate such a huge number in such a short time.
"Well, Iron Egg, you can sit back down first! Ke Shiqing, what do you think? Is the answer correct? "
Li Zexuan smiled and looked at Ke Shiqing.
Ke Shiqing was shocked and could not believe it since he heard Iron Egg's answer. When he heard Li Zexuan's question, he came back to his senses and bowed deeply to Li Zexuan seriously.
"Master, the answer to this question is indeed correct. But I really don't understand why Iron Egg could calculate it in half an hour when it took me a whole day to calculate it. Master, please teach me this efficient algorithm. I'm willing to pay any price! "
As soon as Ke Shiqing finished speaking, the hall was in an uproar.
"Wow! He got it right!"
"It's incredible. He could calculate such a huge number in less than half an hour. Is our new master the reincarnation of an immortal? How can his disciple be so good? "
"He must be the reincarnation of an immortal. That's great. I can listen to Master's lectures in the future and learn this magical algorithm!"
"If I can learn this algorithm, I will definitely be able to enter the Four Gates Academy next year!"
"Even the seniors in the Four Gates Academy are not this good!"
… …
Kong Yingda and Xu Hongzhi both opened their eyes wide and almost pulled their beards off.
Li Zexuan pressed his hands in the air. Everyone immediately quieted down and looked at him.
"Shiqing, do you see these seven lines on the blackboard? These strange small words are a simpler counting method that I invented. As for the calculation process, it is also very simple. I will explain it to you in the future. Now, do any of you have any questions? If you want to ask, hurry up! "
Li Zexuan took a branch, which he casually broke in the Imperial College before he came. He used the branch to point at the calculation marks left by the Iron Egg on the blackboard and explained it to Ke Shiqing.
The Arabic numerals were first invented by the ancient Indians. Later, after 700 AD, the Arabs conquered the Punjab region and captured a mathematician from northern India. The Arabs then learned the Indian numerals and mathematical symbols and spread them to Europe, where they were then modernized by the Europeans.
During the Zhenguan period, there were no Arabic numerals in the world. Li Zexuan only thought of it later. Therefore, it was not wrong for him to say that he invented it.
When Ke Shiqing heard that he would have the opportunity to learn from Li Zexuan in the future, he could not help but be very excited. He respectfully bowed to Li Zexuan and said, "Thank you for your teaching, Mr. Li Zexuan. I have no more questions. Mr. Li Zexuan has opened up a new path and created his own school of mathematics. I can't catch up with you in the field of mathematics!"
Kong Yingda and Xu Hongzhi looked at each other and saw a trace of horror in each other's eyes. It was easy to create one's own school of mathematics, but it was easier said than done to construct a complete and rigorous school of thought.
Since ancient times, those who were able to create their own sects and schools were all famous grandmasters or even great sages! For example, Confucius, Laozi, and others. If Li Zexuan's self-created school of thought could stand up to scrutiny, he would probably become a saint in the future!
Was this the emergence of a saint in a golden age?
Li Zexuan was secretly pleased by Ke Shiqing's praise. He waved his hand and said with a smile, "Alright, if anyone has any questions, please ask. If there are no questions, I will officially start the class!"
The rest of the students looked at each other. Li Zexuan's disciple was already so powerful. How would they dare to go out and look for trouble? Therefore, Li Zexuan waited for a long time, but no one stood up to ask a question. Just as he was about to officially start the class, he heard a loud voice coming from outside the room.
"Haha, I have a question. Dr. Li, please answer it!"
…
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