Agents of the Three Kingdoms

The place where Zheng Xuan lived was next to Xun Chen's house, which used to be Han Fu's other courtyard, with three entrances and three exits as standard.The layout of the whole yard is huge. In the backyard, rockery, ponds, horse farms, etc. were built.When Zheng Xuan came, Xun Chen arranged the courtyard for Zheng Xuan to live in.Wang Lei and Xun Chen came outside the mansion, and the servants in the mansion led Wang Lei and Xun Chen in after seeing them.

The two sat down in the hall, waiting for Zheng Xuan's bookboy to notify them.

Not long after, the book boy came back again.

The book boy apologized, and said respectfully: "Master Wang Zhoumu and Master Xun are discussing arithmetic with others, so I don't have time to see you two. I'm afraid, I can only come again next time."

Wang Lei smiled and said, "It's okay, it doesn't matter if you wait."

The book boy shook his head and said, "Mr. Wang Zhoumu, you never know when you are talking about arithmetic with others. Sometimes, it may end in a quarter of an hour; sometimes, it takes half an hour; It's over... There is no definite time, so I'm afraid it will delay Wang Zhoumu's time. Wang Zhoumu is busy with government affairs, so why don't you go back to the mansion to take care of your affairs, after the discussion, sir, I will tell you immediately, what do you think Wang Zhoumu wants?"

Xun Chen nodded, and the book boy responded appropriately.

Wang Lei didn't want to return empty-handed, and said with a smile: "I've dabbled in arithmetic a little bit, and I want to hear Master Zheng's opinion. Why don't you take us to the place where Master Zheng discussed, and Mr. Xun and I listen in, how about it?"

Xun Chen frowned, thinking: When did my lord understand arithmetic?

I definitely want to meet Zheng Xuan!

Xun Chen made a preconceived judgment, but shook his head in his heart.Xun Chen personally greeted Zheng Xuan, knowing Zheng Xuan's character, he would not stop talking just because Wang Lei was the state shepherd of Jizhou.

The book boy thought for a while, nodded and said, "It's fine if Wang Zhoumu is willing to listen. But after Wang Zhoumu sits down, don't talk casually. If you disturb Master Zheng's thoughts, I will also be implicated."

"Thank you!"

Wang Lei thanked him, and went to the backyard with Xun Chen.

Xun Chen followed Wang Lei, and said in a low voice as he walked: "My lord, Mr. Zheng has a good temper and is easy to talk. But when it comes to academic issues, Mr. Zheng is very strict and doesn't allow any mistakes. After we go, the lord will definitely Make a good impression on Master Zheng."

Wang Lei replied: "Don't worry, sir, I understand!"

After all, Xun Chen was still worried that Wang Lei would interject indiscriminately, which would cause Zheng Xuan to feel bad for Wang Lei.

After all, arithmetic is not understood by ordinary people.

A group of people came to the backyard, and in the pavilion next to the pond, there were bursts of disputes.Now it is spring, the winter snow has just melted, the sun is rising, the sun is shining brightly, and the golden light is shining in the pavilion, covering the few people in the pavilion with a layer of golden light.

After Wang Lei approached, he saw clearly the people in the pavilion.

In the pavilion, there are three people.

Among them, the one sitting on the right was wearing a black robe and a cloak, and was about 60 years old.He was sitting upright, with a majestic face, but there was a soft smile on his face, making people dare not be presumptuous in front of him, but they would not feel uncomfortable.

An old man sitting on the left is also around sixty.This person was wearing a sky-blue robe, with a calm and elegant expression, and three strands of long beard fluttering in the wind, sitting in the pavilion, giving people a feeling of being out of the world.

The third person is a middle-aged man in his thirties.

He sat on the side of the pavilion with a respectful expression, as if he was listening attentively.

The three of them are together, mainly focusing on the conversation between the two old men.

The bookboy brought Wang Lei and Xun Chen close to the pavilion, and whispered, "Mr. is wearing a sky-blue robe, and the old man who is talking to Mr. next to him is the descendant of King Lu's family. His name is Liu Hong. Mr. Liu is also a teacher and a friend. They all like arithmetic. The middle-aged man sitting in the back is Xu Yue, a disciple of Master Liu, who is also proficient in arithmetic. Master Liu and Mr. Xu just arrived in Ye County today. Talk to sir."

"Liu Hong is here?" Xun Chen couldn't help exclaiming in a low voice.

Among scholars, Liu Hong was not as famous as Zheng Xuan.However, in terms of arithmetic, astronomy, and political achievements, Zheng Xuan could not compare with Liu Hong.Moreover, Liu Hong is an authentic royal family member, with high seniority and respected status.

Surprise also appeared in Wang Lei's eyes.

This round of discussion and exchange, even Liu Hong came quietly, it was really not easy.

Wang Lei took a deep breath to calm himself down, and under the leadership of the book boy, he came to the pavilion and sat down.Liu Hong and Zheng Xuan were discussing a problem, but they simply glanced at Wang Lei and Xun You, and their minds returned to the discussion of arithmetic.

Wang Lei and Xun You sat quietly, listening to Zheng Xuan and Liu Hong talking.

"Brother Yuanzhuo, don't argue. Your algorithm is obviously wrong, so there is no need to argue."

Zheng Xuan stroked his beard and denied Liu Hong's words.

Liu Hong was not angry, and said in a calm manner: "Brother Kang Cheng, I can get the correct result, why is it wrong? Our problem is: Looking at the seven floors of the towering tower from a distance, the red lights multiply; 380, try to calculate how many lights are on the top of the tower? The problem is this, I made a bold assumption, reasoned carefully, and finally came to a total of 3 lights on the top of the tower, what’s wrong with that?”

Zheng Xuan snorted, and said, "Brother Yuan Zhuo, you are not so blinded by arithmetic. At the beginning, you assume that there is one lamp on the top of the tower, and after doing the calculation, the result of one lamp cannot be combined; then, suppose there is one lamp on the top of the tower. 1 lamps, the result is still wrong; finally, you assume that there are 2 lamps on the top of the tower, and after this calculation, the result is correct... The result is obtained, but how do you explain it? Assuming from 3, if so, what's the point? It's better not to calculate, this is not arithmetic."

Liu Hong said angrily, "Tell me, how can you answer it?"

Zheng Xuan frowned, his eyes serious.

The hypothesis put forward by Liu Hong can give an answer, but it is difficult to have a specific law.However, Zheng Xuan has no other way to answer the result, which is a headache.

Xu Yue interjected, "Teacher, where did you two get this question?"

Liu Hong said: "An ancient book!"

Wang Lei blinked. The topic discussed by Liu Hong and Zheng Xuan was recorded in "Algorithm Tongzong" compiled by Ming Dynasty mathematician Cheng Dawei.However, Cheng Dawei's question changed slightly, asking how many lights there are on each floor.A slight change hides the calculation method starting from the top of the tower. It is very complicated and difficult if you do not understand the calculation starting from the light on the top of the tower.

Zheng Xuan said with emotion: "This arithmetic problem is really difficult to answer. When discussing Dao, I have to raise this problem and brainstorm, hoping to come up with a solution."

Wang Lei said: "Master Zheng, Master Liu, I can answer this question."

"Oh, little friend can you answer?" Zheng Xuan's eyes were excited, and there was no slightest contempt in his eyes.

Liu Hong hurriedly said, "Quickly tell me how to answer."

There was a look of surprise in the eyes of the two old gentlemen.

However, Xun Chen next to Wang Lei couldn't help swallowing.Xun Chen stared at Wang Lei, thinking: "My lord, this time, I'm too reckless, I shouldn't speak up indiscriminately just to win the favor of Zheng Xuan and Liu Hong!"

Xun Chen knew Wang Lei's situation well, and didn't believe Wang Lei could figure it out.