Zheng Xuan lived in the place next to Xun Chen's house was once Han Fu's other courtyard. The standard three-in and three-out are the entire courtyard. The layout of the whole yard is extremely large. Rockery, pond, and horse farm are built in the backyard. When Zheng Xuan arrives, Xun Chen arranges the yard for Zheng Xuan to live in. Wang Lei and Xun Chen arrive at the mansion outside the mansion. After seeing it, the servants in the mansion led Wang Lei and Xun Chen into the house.

The two sat in the hall waiting for Zheng Xuan's book boy to inform him

Soon, Shutong is back

Shutong said with apologies and respectfully: "Mrs. Wangzhou, Mr. Xun is talking to people about arithmetics. There is no time to see you. I am afraid you can only come again next time."

Wang Lei smiled and said, "It doesn't matter if you wait a moment."

Shutong shook his head and said, "Mr. Wangzhou Mu never knows when he talks about arithmetic. Sometimes it may end in a quarter of an hour; sometimes it lasts for half an hour; sometimes it cannot end in half a day... Without a certain time, it may delay Wangzhou Mu's time. Wangzhou Mu is busy with government affairs. It is better to go back to your house first. After the discussion is over, I will tell Mr. Wangzhou Mu immediately what to do."

Xun Chen nodded and wrote a good deal.

Wang Lei was unwilling to go home empty-handed and said with a smile: "I have a little bit of math and I want to hear Master Zheng's opinion."

Xun Chen raised his eyebrows and thought: When will the lord understand arithmetic?

I must have wanted to meet Zheng Xuan

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

Shutong thought for a while and nodded, "It is okay for Wangzhou Mu to be willing to listen, but after Wangzhou Mu sat down, he must not speak casually to disturb Master Zheng's thoughts, and I will also be implicated."

“Thank you”

Wang Lei thanked Xun Chen and walked to the backyard

Xun Chen followed Wang Lei and whispered: "Mr. Zheng has a good temper and speaks very well, but when it comes to academic issues, Master Zheng is very strict and does not allow any mistakes. After the lord, he must leave a good impression on Master Zheng."

Wang Lei replied: "Sir, don't worry, I understand."

After all, Xun Chen is still worried that Wang Lei’s random interruption will lead to Zheng Xuan’s disgust towards Wang Lei.

After all, arithmetic is not something that ordinary people can understand.

The group came to the pavilion next to the pond in the backyard and heard a series of disputes. It was already spring and winter, and the snow had just turned, and the sun was rising. The golden light shone on the pavilion. The pavilion put a layer of golden light on the pavilion.

Wang Lei got closer and saw clearly the people in the pavilion

There are three people in the pavilion

Among them, a man sitting on the right was wearing a black robe and a cloak. He was about sixty years old and sat upright, looking majestic, but his face had a soft smile on his face. He didn't dare to be presumptuous but didn't feel uncomfortable in front of him.

An old man sitting on the left was about 60 years old. This man was wearing a sky blue robe and looked calm and elegant. Three long beards under his jaw fluttered in the wind. Sitting in the pavilion gives people a feeling of being out of the world.

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

He sat in the pavilion with a respectful look on his face

The three of them are mainly talking to two old men

Shutong took Wang Lei and Xun Chen to the pavilion and whispered: "Mr. He is wearing a sky blue robe. The old man who talks to Mr. Lu is the descendant of the royal family of King Lu. Mr. Liu Hong, Mr. Liu, and Mr. Liu, both teachers and friends, like arithmetic. The middle-aged man named Xu Yue, is a disciple of Mr. Liu, and Mr. Xu, who is also proficient in arithmetic. Mr. Liu and Mr. Xu have just arrived in Ye County today and have time to rest. He talks with Mr. directly before he has time to rest."

"Liu Hong is actually here." Xun Chen couldn't help but exclaim in a low voice when he heard this.

Liu Hong cannot compare with Zheng Xuan's fame in the scholars, but Zheng Xuan cannot compare with Liu Hong, and Liu Hong is an authentic royal family member with high status and respect

A look of surprise appeared in Wang Lei's eyes

This time, even Liu Hong came quietly. It was indeed not easy.

Wang Lei took a deep breath to calm himself down. The lead of Shutong came down to the pavilion and sat down. Liu Hong and Zheng Xuan were discussing the problem. They just glanced at Wang Lei and Xun You and returned to the discussion of arithmetic.

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

"Brother Yuan Zhuo, don't argue. Your algorithm is obviously wrong. Don't argue."

Zheng Xuan's beard stroke denies Liu Hong's words

Liu Hong said slowly without anger, "Brother Kang Cheng, why can I get the correct result? Our problem is: From afar, there are more red lights on the seventh floor of the tower; there are 381 lamps in total, and the problem is that the problem is that I boldly assume and carefully reasoned, and finally came to a total of 3 lamps on the top of the tower. What's wrong with this?"

Zheng Xuan snorted and said, "Your Math is not like this. You can't figure it out. At first, you assume that one lamp on the top of the tower can't get together. Then, if there are two lamps on the top of the tower, the result is still wrong. Finally, you assume that three lamps on the top of the tower can calculate it in this way and then you guess the result is correct... The result is obtained, but how do you explain it? Do you have to start from 1 when encountering such a problem? If this is the case, what's the point? Why not calculate it is not arithmetic."

Liu Hong said angrily: "You said you have any solutions?"

Zheng Xuan frowned and looked solemn

Liu Hong proposed an assumption that can be answered but it is difficult to have specific rules. However, Zheng Xuan has no other way to answer the results, which is a headache.

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

Liu Hong said: "In an ancient book"

Wang Lei blinked and the topic discussed by Liu Hong and Zheng Xuan. In the "Algorithm Tongzong" compiled by Cheng Dawei, a mathematician in the Ming Dynasty, there is a slight change in the question of "Dawei" that does not process. Asked how many lamps there are on each floor, it is slight changes. The calculation method starts from the top of the tower. If you don't understand, it is very complicated and difficult to calculate from the lamp on the top of the tower.

Zheng Xuan sighed: "This arithmetic question is really hard to answer. When discussing the Tao, I have to put forward this question to brainstorm and hope to come up with a solution."

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

"Oh, my friend can answer it." Zheng Xuan's eyes were excited and there was no thought of contempt in his eyes.

Liu Hong hurriedly said: "Tell me how to answer it quickly."

The look of surprise appeared in the eyes of both old men

However, Xun Chen next to Wang Lei couldn't help swallowing his saliva Xun Chen stared at Wang Lei and thought to himself: "Lord, you're too reckless this time, you shouldn't speak randomly to gain the favor of Zheng Xuan and Liu Hong."
Chapter completed!