My father Zhu Gaoxu

Chapter 654 Arithmetic Textbook
"Prince, are you sure this is an arithmetic textbook? Why can't we understand it?"

Zheng Li took the arithmetic textbook that Zhu Zhanhe gave him and asked Zhu Zhanhe with a speechless expression.

Behind Zheng Li, there were several people following, and they all looked embarrassed. In fact, the teaching materials given by Zhu Zhanhe seemed to them like a heavenly book.

"It's normal that you can't understand it. In order to make calculations easier, I introduced some mathematical symbols. You can understand them as long as I explain them to you!"

Zhu Zhanhe laughed.

He had expected this situation a long time ago. Arabic numerals were okay, because this thing was originally invented here in Tianzhu. People like Zheng Li must have seen it after coming to Tianzhu, but for the operation symbols such as addition, subtraction, multiplication and division, they I can't understand.

"Prince, what do you mean, you want to give us lectures first, and then we will teach capable students?"

At this time, a middle-aged man following Zheng Li asked. This man's name was Huang Wen. He was a doctor of arithmetic from the Imperial College. He had a lot of research on arithmetic. He was famous in the Ming Dynasty, but unfortunately he had no talent in the imperial examination. After half his life, he could only pass the Tongsheng examination. In the end, he felt that there was no hope in the imperial examination, so he simply came to Tianzhu to try his luck, but he did not expect to be reused.

"That's right. Based on Dr. Huang's research on arithmetic, you will understand the benefits of my textbook with just a little research. For example, if you usually calculate a problem, the process is too complicated and the speed is very slow. But if you use the textbook content, you can get the answer in almost a moment!”

When Zhu Zhanhe said it to the end, he couldn't help but show a bit of pride.

In order to compile this textbook, he racked his brains and wrote everything he could think of. There may be some omissions, but he can only make up for them slowly in the future.

"Is the content in the textbook really so amazing?"

Huang Wen showed a skeptical expression. Although he had no talent in the imperial examination, he was quite confident in arithmetic. Especially after coming to Tianzhu, he received many outside arithmetic works, which further improved his research on arithmetic. He has made great progress with each passing day, and now he is confident that even if he returns to Ming Dynasty, few people can surpass him in arithmetic.

"If Dr. Huang doesn't believe it, why don't we have a test on the spot? You use your method to calculate, and I use mine to calculate. How about we see who can calculate faster and more accurately?"

Zhu Zhanhe is a person who likes to use facts to reason, so he asked Huang with a smile.

"This...I'm afraid it's not good?"

Huang Wen was a little hesitant, not because he was afraid of Zhu Zhanhe, but because he was afraid that Zhu Zhanhe would be disgraced if he lost. What if Zhu Zhanhe became angry again and blamed himself?
"There's nothing wrong with it. It's just a discussion of knowledge. Dr. Huang, if you lose, you have to learn from me!"

Zhu Zhanhe waved his hand and finally said very confidently.

This method of provoking the generals was indeed effective. Huang Wen was very confident in his arithmetic skills, so when he heard Zhu Zhanhe's words, he immediately responded: "Okay, since the prince said so, then it is better for the subordinates to be respectful than to obey!"

"Zheng Jijiu, which one of you will give the question?"

Zhu Zhanhe laughed and then asked Zheng Li next to him.

"Since the prince is so interested, why not let me come up with the question?"

Zheng Li also laughed and stood up and said that he was a Jinshi. Although his research in arithmetic was not as good as Huang Wen's, he was still much better than the average person.

So Zheng Li asked the questions in public, and the questions were not very difficult. He was mainly afraid that Zhu Zhanhe and Huang Wen would be too embarrassed if someone couldn't do it.

So Zheng Li came up with a classic question of chicken and rabbit in the same cage, but he changed the numbers to be larger, making the calculation a little more difficult.Zhu Zhanhe and Huang Wen each wrote their own calculation processes under the paper.

Huang Wen was very familiar with this basic question. Although the numbers had changed, the calculation process was the same, so he was very confident and started calculating as soon as he picked up his pen.

However, just as Huang Wen was writing a few lines, Zhu Zhanhe next to him suddenly put down the pen in his hand and said: "I figured it out!"

"What? It's impossible!"

Huang Wen looked up at Zhu Zhanhe with a shocked expression. Even if it was a basic question like a chicken and a rabbit in the same cage, it was impossible to calculate it so quickly!
"Nothing is impossible. The answer is that there are 37 chickens and 56 rabbits. If you don't believe it, Dr. Huang, you can check it!"

Zhu Zhanhe said with a chuckle.

For him, a chicken and a rabbit in the same cage is a simple linear equation of two variables that cannot be simpler. He only needs to set two unknowns and then list the formula to get the answer.

In contrast, Huang Wen used the traditional calculation method. If nothing else, he had to write a lot of Chinese characters just for calculation, so the speed was certainly not as fast as his.

Huang Wen was dissatisfied, so he immediately calculated it again from scratch, and the answer he came up with was exactly the same as Zhu Zhanhe's, which made him feel a little distracted.

"Prince, how can you calculate so quickly?"

At this time, Zheng Li couldn't help but asked curiously. If he hadn't come up with the question on the spur of the moment, he might have thought that Zhu Zhanhe was cheating or knew the answer in advance.

"I admit defeat, Prince. How did you calculate this?"

Huang Wen also reacted at this time and asked Zhu Zhanhe. The others also looked at him in confusion.

Zhu Zhanhe smiled slightly, then took out his calculation process and said: "My planning method is actually very simple. It is to introduce some symbols into arithmetic, which reduces the entire calculation process by more than half, and there is no need to write What Chinese characters..."

Zhu Zhanhe said, using his own calculation process as an example, he explained to Zheng Li and Huang Wen the meaning of various mathematical coincidences.

Others may have been confused, but after Huang Wen listened to Zhu Zhanhe's explanation, he suddenly understood where he had lost.

After introducing various symbols into the algorithm, the calculation process is not only simplified several times, but also some new solutions can be derived. This is definitely a major pioneering work in the history of arithmetic.

"The prince is a great talent, and the lower officials are convinced!"

After Huang Wen finished listening, he immediately saluted Zhu Zhanhe. As he spoke, he looked at the arithmetic textbook again, his eyes full of excitement. If he mastered the contents of the textbook, his attainments in arithmetic would definitely be improved. Rising sharply again.

Seeing that even Huang Wen had given up, this also proved that the content in Zhu Zhanhe's textbook was really extraordinary, so Zheng Li and the others naturally had no objections.

So Zhu Zhanhe asked Zheng Li to organize arithmetic teachers from two primary schools and personally taught them, explaining the contents of the textbook in detail.

In fact, as long as the various operation symbols are mastered, the content of the entire textbook is not difficult for most people. For example, Huang Wen only spent three days to understand all the operation symbols, and the fourth day can help Together with Zhu Zhanhe, he taught others lessons.

(End of this chapter)