Zheng Xuan's place of residence, close to Xun Chen's residence, used to be Han Fu's courtyard, the standard three in and three out, the pattern of the whole yard is very large, in the backyard built rockery, ponds, horse farms, etc., Zheng Xuan arrived, Xun Chen arranged the yard to Zheng Xuan to live, Wang Lei and Xun Chen came to the outside of the mansion, and the attendants on the house led Wang Lei and Xun Chen into after seeing it

The two sat down in the hall and waited for Zheng Xuan's scholar to inform them

After a while, the scholar returned

The scholar said with an apologetic face: "Mr. Wang Zhoumu and Mr. Xun are talking about arithmetic with people, and I don't have time to see you two for the time being, I'm afraid I can only come back next time."

Wang Lei smiled and said: "It doesn't matter if you wait."

The scholar shook his head and said: "Mr. Wang Zhoumu talks about arithmetic with people, and he never knows when it will end, and sometimes it may end in a quarter of an hour; Sometimes it can be as long as half an hour; Sometimes it doesn't end in half a day...... There is no definite time, I am afraid that it will delay Wang Zhoumu's time, Wang Zhoumu is busy with government affairs, it is better to go back to the house first to be busy with your affairs, Mr. After the discussion, I will immediately inform Mr. Wang Zhoumu how to go."

Xun Chen nodded, and the scholar responded quite decently

Wang Lei didn't want to go home empty-handed, and said with a smile: "I have a little dabbling in arithmetic, and I also want to hear Master Zheng's opinions, why don't you take us to the place where Master Zheng discussed and Mr. Xun and I can observe."

Xun Chen raised his eyebrows and thought: When did the 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, understood that Zheng Xuan's personality would not stop talking because Wang Lei was the state pastor of Jizhou

The scholar thought for a while and nodded: "It's okay for Wang Zhoumu to be willing to observe, but after Wang Zhoumu sits down, don't talk casually and disturb Master Zheng's thoughts, I will also be implicated."

"Thank you"

Wang Lei thanked him and Xun Chen and went to the backyard

Xun Chen followed behind Wang Lei, and said in a low voice as he walked: "Master Zheng has a good temper and is very easy to speak, but when it comes to academic issues, Master Zheng is very strict and does not allow a little mistake, and after he goes, the lord must leave a good impression on Master Zheng."

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

In the final analysis, Xun Chen was still worried that Wang Lei's indiscriminate interjection would cause Zheng Xuan to have a bad feeling for 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 there were bursts of disputes, and now it was spring and winter, the snow was beginning to melt, the sun was rising, the sun was shining, and the golden light was sprinkled in the pavilion, and several people in the pavilion were smeared with a layer of golden light

When Wang Lei got closer, he saw the people in the pavilion clearly

There were three people in the pavilion

One of them sat on the right side, wearing a black robe and a big coat, about sixty years old, he was sitting in a precarious position, his face was majestic, but there was a soft smile on his face, which made people neither dare to be presumptuous in front of him, but also did not feel uncomfortable

An old man sitting on the left side is also about sixty, this person is wearing a sky blue robe, his expression is calm and elegant, and the three long whiskers under his chin flutter in the wind, sitting in the pavilion give people a feeling of dust

The third person was a middle-aged man in his mid-thirties

He sat in the pavilion with a respectful expression and a deferential look

The three of them are mainly talking to the two old men

The scholar took Wang Lei and Xun Chen to approach the pavilion and whispered: "Mr. is wearing a sky blue robe, and the old man who is talking to Mr. next to him is named Liu Hong after the Lu Wang clan, Liu Shi and Mr. are also teachers and friends, both like arithmetic, the middle-aged man sitting on the inside is named Xu Yue, is a disciple of Liu Shi, and is also proficient in arithmetic, Liu Shi and Mr. Xu only arrived in Ye County today, and they didn't have time to rest after arriving at the house, so they talked directly with Mr."

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

Liu Hong can't compare to Zheng Xuan's fame in Shilin, but Zheng Xuan's achievements in arithmetic, astronomy and politics can't be compared with Liu Hong, and Liu Hong is an authentic royal family, with high seniority and respect

Wang Lei's eyes also showed surprise

This time, even Liu Hong came quietly, and it was really not simple

Wang Lei took a deep breath to calm himself down, and under the leadership of the scholar, he came 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 their minds returned to the discussion of arithmetic

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

"Brother Yuan Zhuoxian, don't argue, your algorithm is obviously wrong, don't argue"

Zheng Xuanshu denied Liu Hong's words

Liu Hong was not annoyed and said unhurriedly: "Brother Kang Cheng, I can get the right result, why is it wrong, our question is: Looking at the tower, the seven-story red light cup has multiplied; A total of 381 lights, try to calculate how many lights on the top of the tower, the question is like this, I boldly assumed and reasoned carefully, and finally came to the conclusion that there are a total of 3 lights on the top of the tower, what is wrong with this?"

Zheng Xuan snorted and said: "Brother Yuan Zhuoxian's arithmetic is not like you, at the beginning, you assumed that there was 1 lamp on the top of the tower, and the result of a lamp could not be made up; Then, assuming that there are 2 lights on the top of the tower, it still turns out to be wrong; In the end, you assume that there are 3 lights on the top of the tower, and then the result is correct...... The result is out, but how do you explain it, do you have to start with 1 when you encounter such a problem, what is the point of this, it is better not to calculate, this is not arithmetic"

Liu Hong snorted angrily and said, "What do you say you have to do to answer it?"

Zheng Xuan frowned, his eyes solemn

The hypothesis proposed by Liu Hong can be answered, but it is difficult to have a specific law, but Zheng Xuan has no other way to solve it, and the result is a headache

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

Liu Hong said: "An ancient book"

Wang Lei blinked, Liu Hong and Zheng Xuan discussed the topic in the Ming Dynasty mathematician Cheng Dawei's "Algorithm Tongzong" recorded that the process of the big position of the subject changed slightly, asking how many lights on each floor changed slightly, hiding the calculation method from the top of the tower, if you don't understand, starting from the top of the tower to calculate, it is very complicated and difficult

Zheng Xuan sighed: "This arithmetic problem is really difficult to solve, when discussing the Tao, I have to put this problem up, brainstorm, hoping to come up with a solution."

Wang Lei said: "I can answer the question of Master Zheng and Master Liu"

"Oh, little friend can answer," Zheng Xuan's eyes were excited, and there was no trace of contempt in his eyes

Liu Hong hurriedly said: "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 but swallow his saliva, Xun Chen stared at Wang Lei and thought: "Lord, this time is too reckless, you shouldn't just open your mouth in order to gain the favor of Zheng Xuan and Liu Hong."

Xun Chen knew Wang Lei's situation and didn't believe that Wang Lei could calculate it