I'm really not doing business

Chapter 148 Uncle Da Zong, Thoughtful Thinking
He Xinyin belonged to the Taizhou School, while Xu Guangqi, Xu Guangqi's teacher Jiao Hong, and Jiao Hong's teacher Geng Dingxiang also belonged to the Taizhou School.

The origin of the Taizhou School is Wang Gen, a disciple of Wang Shouren. Wang Gen also said that my body is a rule, the world and the country are a square, the body is the foundation, and the world and the country are the end. , then you know that the square is not right, and the moment is not right.

Pull out the moment, measure.

By measuring yourself, you can know whether the world is right or not. If the world is not right, it is because each individual is not right. As the foundation, everyone manages themselves well, and the world can be governed. Therefore, to correct people, you must first correct yourself.

However, most people in the Taizhou School like to play out of context. The disciples of the Taizhou School are the same as Wang Shouren’s disciples. The smell of being the end of the world suddenly becomes unbearable.

Wang Gen still has many concepts, such as those with simple and equal thoughts: ordinary people are not low, but princes are not high; Yao and Shun are the same as passers-by, saints are one with ordinary people;

What is a sage, and how to judge the standard of a sage?The common people's daily routine is the saint's routine.

This is Wang Gen's standard for a saint, but what about He Xinyin's standard?He Xinyin's standard is that the sage is myself, and I will appoint the world to teach, raise and manage the world.

"Wang Sikou, serving the court is no joke." Zhu Yijun rejected Wang Chonggu's plan to go back. Since Wang Chonggu got the Ministry of Officials' meeting, and got the court meeting to push, he finally became a minister without making any mistakes. Zhu Yijun would not 'demote' him back to the place for no reason.

Wang Chonggu knelt on the ground, feeling a little complicated for a moment. On the one hand, he found that the little emperor and Zhang Ju were exactly the same people, they just followed the rules. This is what his son Wang Qian always emphasized: life and death are in the hands of a gentleman The blessings of the world are in the hands of villains, and the world is in great danger, and Wang Qian also showed Zhang Siwei his villain style;
On the other hand, Wang Chonggu really wanted to go back. The pool in the capital was too deep, and there was an old monster Zhang Juzheng and a little monster, His Majesty the Emperor. If he was not careful, he would lose everything.

"The minister leads the decree." The emperor refused to let him leave, so he could only kowtow and continue the court discussion.

The official department played to Wang Xiyuan during the matter, requesting that the examination method be passed without a name, and after the draft list is written, the bottom book will be opened to fill in the list to prevent fraud.

Zhang Juzheng didn't finish reading Wang Xiyuan's memorandum, and Wang Xiyuan was talking about the officials' affairs afterwards.

The promotion of the official department to the capital is to be promoted from a local official to the capital. It is not based on ability, but purely on softness and familiarity. It depends entirely on flattery and human relations.
In terms of local affairs, those who are greedy and cool, preside over important places, do not have any credit to the court, just because of flattery and favor, they can choose their own place. What about the party bureaucracy?

This is no longer an ordinary accusation, but a questioning.

Zhu Yijun said with a puzzled face: "Sir, Ke Chen Wang Xiyuan's memorandum contains a lot of allusions, and the influence is suspected. What is the meaning? Who is he talking about?"

May wish to speak clearly.

Zhang Juzheng replied: "Wang Xiyuan was questioning Zhang Han, the Minister of the Ministry of Officials, who recommended Wang Chonggu as the Secretary of the Ministry of Punishment. The Minister of Household Punishment was the servant of the Ming Dynasty, and Wang Xiyuan was the minister of the eyes and ears. The eyes and ears hurt the vitality, which is not conducive to the country. The official department passed the examination to become the official department, and discovered these problems."

"Especially in local affairs, Yi'a is soft and familiar."

Wang Chonggu looked bitter, Zhang Han and Zhang Siwei never asked his opinion at all, and he never thought of coming back to this muddy water.

Zhang Han quickly shook his hands, knelt on the ground, bowed his head and said obediently: "Chencheng is guilty."

Wang Xiyuan was No. 13 in the third class in the fifth year of Longqing. He was selected by Zhang Juzheng from his own sect. Most of Zhang Juzheng's speeches and actions were based on facts, and it was not the first time that Wang Xiyuan had communicated with the officials. In the past, Wang Xuanshou, the head secretary of Ruian County, Zhejiang Province, was promoted to be the magistrate of Ruian County. During the official affairs, it was discovered that this person had failed the law examination, but was promoted to an official.

After a little inquiring, Wang Xuanshou paid a heavy bribe and left Zhang Siwei's way.The capital and the local government are so appointed, whose official department is the official department?

Zhu Yijun suddenly thought of Sun Piyang's lottery method. After Sun Piyang became the Minister of the Ministry of Officials, he used the lottery method to handle affairs.

"Sir, when the governors from all over the country are asked to inspect the officials, they will be named in the list. What kind of government is it? And what do they want to do?" Zhu Yijun ignored Zhang Han's plea, but asked Wang Xiyuan for a solution.

Zhang Juzheng bowed his head again and said: "Your Majesty, let me tell you that good officials do not specialize in Jinshi in Jiake, and they may not be good officials in Jiake. All officials who are virtuous in the examination should be recommended for office, not based on qualifications, favors, or whether they are good or not." Whose sect is it, if it is just according to Yi A's soft familiarity, this method of employing people will only make the world's officials not seek merit, but seek no faults, and the officialdom will be as dead as a tomb."

"The method of obscuring names is to put an end to the evils of the world's appeasement."

"Wait until the list is published, and then use the bottom book to fill in the name, just like the imperial examination name."

Zhu Yijun thought about it for a while and said: "Sir, the method of employing people, isn't Mr. Zhang Dang also familiar with Yi Ah Ruan?"

"Your Majesty is wise." Zhang Juzheng fell silent. His Majesty made his words very clear. It is true. After the method of obfuscation, Zhang Dang under his sect will also be affected. At that time, those people who are closely united around him will be Don't you want to leave part of it?
But Zhang Juzheng still explained this memorial in detail.

"What does Da Sima think?" Zhu Yijun looked at Tan Lun and asked the leader of the Zhejiang Party for his opinion.

Tan Lun looked like he had nothing to do with himself and watched the fun. Seeing Zhang Han kneeling on the ground trembling, and then watching Wang Chonggu look bitter, he was very happy. Hearing the emperor's question, he immediately said loudly: "I have no objection."

"A minister is an official mostly for battle. Among the army, if you don't kill the enemy or win a battle, you still want to be a general? That is absolutely impossible. The front line will not lie. Losing is losing, and winning is winning. , the rules of celebration, reward, authority and punishment are clear and clear."

"The method of obfuscating the name, I think it is very good."

Zhu Yijun looked at Ge Shouli, and asked with a smile, "What does Zongxian Ge think?"

"I have no objection." Ge Shouli thought for a while, and agreed with Zhang Juzheng's method of obfuscating names. It's not that Zhang Dang himself does not obfuscate his names. Since all other obfuscated names are all obfuscated, it is to formulate the rules of the game, and everyone must According to the rules, he has no objection.

"What does the Minister of the Ministry of Officials think?" Zhu Yijun looked at Zhang Han and said.

Zhang Han knelt on the ground, bit the bullet and said: "I think it's wrong..."

"Oh, that's not right." Zhu Yijun said with a smile: "Mr. Yuan Fu once told me that the minister told you that you should understand, so how can you be vague? Let Wang Xiyuan explain what he didn't explain clearly, and upgrade the place of Jingtang. , but who exactly is A Ruanshu, honestly speaking, don't hesitate."

"I think it's very appropriate!" Zhang Han immediately bowed and shouted loudly, don't ask, don't ask, what should I do if I really ask something?
Wang Chonggu was standing in the hall shining brightly, is there any more ironclad evidence than this?
"Let Wang Xiyuan tell the truth, let me see whether it is the minister of ears and eyes who is hurting my minister of vitality, or the minister of my vitality who is emptying out the vitality of Daming." Zhu Yijun ignored Zhang Han and hit the south wall. up?late!

Zhang Juzheng took out a memorial and looked at Zhang Han. To be honest, he didn't intend to do anything to Zhang Han at all. Zhang Han was the Minister of the Ministry of Officials, not Zhang Juzheng's Minister of the Ministry of Officials.

Zhang Han does not work for the imperial court, and Zhang Juzheng is a man of integrity.

Zhang Juzheng didn't want to tear his face apart, let alone attack Zhang Han. Zhang Han recommended Wang Chonggu. Zhang Juzheng was going to mess with Zhang Han. This was not doing something, but eliminating dissidents, so he just wanted to scold him. Most of them passed Wang Xiyuan's obfuscation method. The three party leaders all agreed, but Zhang Han disagreed.

Yuan Fu held the memorial in his hand and said, "Wang Xiyuan reported that Guo Liang was impeached in Shandong and planned to be transferred to Guangdong; Huo Yuxia in Guangxi failed to investigate and returned to Jiangxi; Hu Zhengen was selected as the prime minister of Guiyang County and Sima Zuo was selected. Jianyang County Chancellor, Zhu Bingxuan Pucheng County Chancellor, Ke Chen Han Ji, and Ministry Minister Liu Bo are already out of tolerance for public opinion, and it is inevitable to investigate, so why determine the lack of Taichang Shaoqing?"

"Ah, this..." Zhu Yijun looked at Zhang Juzheng, this Yuanfu had too much ammunition, let's take a look at the long list!

Zhu Yijun looked at Zhang Han and asked with a smile, "Shangshu Zhang, did Wang Xiyuan falsely accuse you?"

"Yes, or not?" Zhang Han said in a daze. He thought there were only one or two names, but Zhang Juzheng had already checked him out!All the things he did were seen by Zhang Juzheng.

Zhu Yijun almost laughed angrily when he heard it, and asked with a sneer: "I asked you, you asked me? Did you do it or not, and whether there were any disadvantages of bribery and appeasement, you know it yourself, how can I know?"

Zhang Han raised his head and looked at Wang Chonggu, wanting Wang Chonggu to be fair, but Wang Chonggu turned his head without saying a word, Zhang Han looked at Ge Shouli again, Ge Shouli looked at his nose, nose and heart as if the old monk was in meditation Generally speaking, when you don't know and you should pretend to be confused, you have to pretend to be confused.

Zhang Han looked at Wan Shihe, Shangshu of the Ministry of Rites, and hoped that Wan Shihe could help to say something.

Wan Shihe bowed his head after thinking for a while and said: "Your Majesty, I think this is a good way to obscure the name. This book cannot be in the official department. Otherwise, it will be just a formality to fill in the name on the draft list of the official department. I think this After the bottom book is submitted to Beijing, don’t send it to the Six Sections Gallery, Wenyuan Pavilion, or the Supervisor of Rituals, but send it directly to the Wenhua Hall, and put it in front of this official book screen.”

Wan Shihe pointed to the fifteen pages of the high-level official book screen, and said very solemnly: "Just put it here, add a box and lock it, your majesty, under the watchful eyes of so many courtiers, Da Dang, the supervisor of rituals, Look, Your Majesty is watching, when the time comes, the draft list will be announced, and it will not be too late to open the book after your Majesty's decree."

"Wan Shangshu, who will keep the key to this book lock?" Zhu Yijun asked calmly after hearing about Wan Shi.

Wan Shihe said as a matter of course: "Of course it is your majesty's safekeeping! It's what I said, when you open the booklet, please ask your majesty to open the booklet."

"Your Majesty, a seal must be affixed to the box, and the Minister of the Ministry of Officials, Yuan Fu and the Supervisor of Rituals must sew the seals together."

If the box was tampered with, and the Ministry of Officials, Yuan Fu, and Supervisor of Rituals were all partisans of that person, then Daming would perish, and no one would know that the emperor would be replaced by someone tomorrow.

Zhu Yijun was taken aback. He admitted that he had some prejudices against Wan Shihe. He thought that Wan Shihe, the key to the lock, would keep it in his pocket.Taking away a little authority is a little authority.

"Uncle Da Zong, you are thoughtful." Zhu Yijun affirmed Wan Shihe's proposal after hearing about it, and also praised Wan Shihe's work for the first time.

"I am ashamed, Your Majesty's praise." Wan Shihe finally breathed a sigh of relief, he, Minister of the Ministry of Rites, was finally called Da Zongbo, not Wan Shangshu.

Wan Shihe looked at Zhang Han, and asked calmly: "Zhang Shangshu, what do you think of my idea?"

Wan Shihe could only help Zhang Han so far. If Zhang Han disagreed, no one could really save him.

Zhang Han was silent for a long time, then knelt on the ground and said, "I kindly ask you to return home as an official."

"Sure, Mr. recommends one person to serve." Zhu Yijun didn't hesitate, and directly approved Zhang Han's official appointment, and retreated to advance?Then just get out, don't want to do it, some people do it!
There are boomerangs everywhere in the Ming Dynasty. The powerful and wealthy gentry use this sentence to criticize the common people every day, and Zhu Yijun also uses this sentence to criticize the ministers. Zhang Han himself is the official of the Ministry of Civil Affairs, which is the result of Zhang Juzheng and Yang Bo’s compromise. Now that Zhang Han is leaving by himself, why does Zhu Yijun stay?

"Your Majesty, the minister is the minister of the vitality of the Ming Dynasty. The Minister of the Ministry of Punishment has just been appointed, and the minister of the Ministry of Industry Zhu Heng has just been dismissed. The appointment and dismissal of ministers are so frequent, which may cause people to discuss and hurt the vitality of the Ming Dynasty." Zhang Juzheng exhaled foully, and once again Bow your head to intercede for Zhang Han.

Wang Chonggu has already confirmed that Zhang Juzheng is protecting the courtiers at all. Without Zhang Juzheng, the little emperor does not show any sympathy. If the emperor is disobedient, he can change the emperor. However, this emperor is under the protection of Zhang Juzheng, Qi Jiguang, and Feng Bao. Down.

How to change?Like He Xinyin, making noise?
"Sir." Seeing Zhang Juzheng interceding with Zhang Han, Zhu Yijun was a little unhappy. Zhang Juzheng was still too conservative.

"Your Majesty." Zhang Juzheng bowed his head again, His Majesty was still too radical.

Is it a child's play for the country to appoint anyone? If the Ministry of Punishment, the Ministry of Industry, and the Ministry of Officials change their heads so frequently, it will cause trouble.

"Then follow what Mr. said." Zhu Yijun said indifferently. In this round of strife, what did Zhang Han use to fight Zhang Juzheng?Anyway, he is not in charge of the government now, if Zhang Han has problems again, it will be Zhang Juzheng's bottom line.

Zhang Juzheng flicked his sleeves, saluted respectfully, and said quite sincerely: "Thank you, Your Majesty, for your kindness, I am so grateful."

"Sir, you are too serious, please hurry up, please hurry up." Zhu Yijun said hastily.

"Thank you, Your Majesty." Zhang Juzheng stood up now, looked at Zhang Han and said, "Zhang Shangshu, it's better not to object to something that the court officials agree to."

Shameless, Zhang Juzheng really turned his face. Zhang Juzheng's attack this time was just for the purpose of obfuscating his name, not to drive Zhang Han out. Majesty of Wenhua Palace, appeasement?Yia is soft and familiar?Forget about the officials.

Seeing this, Zhang Han could only say helplessly: "I obey the order."

The court discussion is still going on, and it's still a big deal. The night does not close the pond to report the news. The barbarians are ready to move. They are brooding about the capture of Gule village by Ming Dynasty last year, and they are preparing to take revenge. The war in Liaodong is imminent.

Li Chengliang, the commander-in-chief of Liaodong, said to the court: The soldiers are ready to fight again, and when it snows, they can cut off another finger.

Why do we have to wait for the snow to fall, because we are afraid that the opponent will run away and fail to achieve the strategic intention of cutting off one finger.

"Is Uncle Ning Yuan so confident?" Zhu Yijun looked at Wang Guoguang and asked, "Is there any salary owed this year?"

"Reporting to Your Majesty, there is no payment owed." Wang Guoguang said with a red face. The Ministry of Households bought silk for the officials of the Ming Dynasty to make official uniforms. Over the past three years, Wang Guoguang, the Secretary of the Ministry of Household Affairs, has tried every means to fill in the previous holes. Today, he can finally tell His Majesty that there is no salary owed.

Li Chengliang's confidence also comes from this. The full-paid Daming army, native barbarians, and slaves, what do they use to fight the Daming army!

Zhu Yijun heard it, and said with a smile: "It's fine if you don't have one. Since Yongle, all the rewards for wars have come from internal funds, so let's give an order to Uncle Ning Yuan. If you fight well, you will be rewarded. If you fight badly, you will be punished." punishment."

After the court meeting ended, Zhu Yijun did not directly start the banquet, but brought Zhang Juzheng to the side hall. The heavy curtain of the side hall was half opened, and the little emperor looked at the person standing beside a strange musical instrument and smiled. Said: "Uncle Emperor."

"See Your Majesty, is Your Majesty bowing to you?" Zhu Zaiyu hurriedly saluted, while the apprentice Wang Yaozhuo next to him knelt on the ground and performed five prostrations and three kowtows.

Wang Yaozhuo believed that it was the emperor who upheld justice for their family and wiped away their grievances, so he bowed down like this. The viciousness of the Lu family in Shanzhou is self-inflicted, and the local left councilors can't bear it. Even if there is no Wang Yaozhuo, they will be punished .

Zhu Yijun told Wang Yaozhuo not to knock so hard every time, but Wang Yaozhuo insisted on saluting.

"What kind of musical instrument is Uncle Huang?" Zhu Yijun surrounded this strange musical instrument and asked suspiciously.

Zhu Zaiyu looked at the musical instruments in front of him and said confidently: "Your Majesty, the twelve tones are born with eight phases, and the seven tones are produced with five phases. Each has seven tunes, and twelve has 84 tunes."

"I don't understand if Uncle Huang doesn't talk about music theory." Zhu Yijun asked with a smile, "So, what exactly is it?"

In fact, Zhu Zaiyu really wanted to say that you can learn if you don't understand, but His Majesty is tired of learning music theory, so he had no choice but to answer solemnly: "It's just a musical instrument!"

"I first used the strings and found that the 84-key strings are really difficult to play. They are too wide and easy to touch by mistake. So I made this metal string soundboard, which can be rotated to adjust the key. There is a copper key in this key. It has 88 keys, and if it is retuned, it can reach [-] keys."

Zhu Zaiyu opened the covers on both sides to show off his invention.

Zhu Yijun studied it for a while and found that it was a piano, but it was square and it was hard to tell when the cover was not open.

It is about five feet two inches long and four feet five inches wide. The outer shell is made of fir, and the whole body is brushed with tung oil without any flaws. The inside is produced by the Bingzhan Bureau and used by the royal family. Zhu Yijun doesn't understand music theory, nor does he know this thing What the hell is in the belly.

"Uncle Huang, let's start your performance." Zhu Yijun didn't talk nonsense, and asked Zhu Zaiyu to play a section before talking.

Zhu Zaiyu asked Wang Yaozhuo to start. Wang Yaozhuo came from a poor background. Wang Yaozhuo really had no experience with the art of music, but he studied with Zhu Zaiyu for nearly a year.

Zhu Zaiyu wanted to tell the little emperor that as long as he was willing to learn, he would be able to learn well.

Wang Yaozhuo was obviously not very proficient. After stumbling for a while, Zhu Zaiyu sat down in front of the piano and began to play smoothly.

Zhu Yijun really doesn't have that musical talent. He only has two words for Zhu Zaiyu's playing.

"It sounds good." Zhu Yijun looked at Zhang Juzheng and said, "Do you understand music theory, sir?"

"Reporting to Your Majesty, I don't understand, so I can only hear something good." Zhang Juzheng was born in a military household. For music, if you ask him to beat the drums, he can still knock out one, two, three, let him appreciate music , that is completely impossible to taste, it sounds really good, and the timbre is really full.

"Sir, do you want to learn?" Zhu Yijun looked at Zhang Juzheng and asked.

"I have business to do, so I don't want to learn about it." Zhang Juzheng thought about it, expressing his distaste for learning music.

If you don’t know how, Zhu Yijun can say openly, if you don’t know how to do it and don’t learn it, then it is useless for governing the country, so don’t learn it.

"If the uncle is short of money, he can talk." Zhu Yijun doesn't understand music, but he still strongly supports Zhu Zaiyu's music career, basically speaking, there is no limit.

Zhu Zaiyu really didn’t spend much money playing music, because his musical instruments were all produced by the military bureau, and his apprentices all followed him to learn arithmetic. Since Zhu Zaiyu returned to Beijing, he spent less than 3000 yuan on playing and calculating. two silver.

"I obey the order." Zhu Zaiyu was helpless. He had already shown the only music in the world, but His Majesty was still not interested in music theory.

It's like playing the piano to a cow!

"I sent the Innate Taiji Diagram and the Five Elements Taiji Diagram to Uncle Huang, Uncle Huang, why do the two curves almost coincide but not coincide?" Zhu Yijun asked for the answer.

Zhu Zaiyu replied very honestly: "I honestly don't know."

He did understand those pictures, and he didn't know if it was a coincidence, or there was some reason for the infinity of heaven and earth in them, but he didn't know, let alone guess.

"Okay." Zhu Yijun said with a smile: "There is no rush, just study slowly."

"Is the emperor giving a lecture on arithmetic today? If not, I will go to the banquet with my husband." Zhu Yijun stood up and planned to leave. Zhu Zaiyu came to present a congratulatory gift today to let His Majesty know that he is not returning to Beijing Those who eat dry food are really working. Your Majesty's investment is not without returns.

"Your Majesty, I really have something to teach about arithmetic." Zhu Zaiyu said hastily.

Zhu Yijun said with increasing interest: "Oh? What is it?"

"Zu Chong calculated pi." Zhu Zaiyu bowed his head and said.

Zhu Yijun nodded repeatedly and said, "I'm very interested, very interested, tell me quickly."

Zu Chongzhi clearly calculated the last seven digits of pi, and later generations still use the three-week diameter as one. Zhu Yijun was very interested in Zu Chongzhi's method of calculating pi.

Draw a circle, then measure its length with a line, divide the circumference by the diameter, don't you get pi?

There are errors in this kind of measurement, and it is absolutely impossible to calculate the last seven digits of pi. If mathematicians do this calculation, they are not mathematicians.

"Your Majesty, it is very convenient to calculate the prescription. It is not as difficult as imagined. Only those idiots who don't understand anything will say that it is impossible for Zu Chongzhi to calculate to seven decimal places. Yes!" Zhu Zaiyu first corrected a common cognitive error, that is, it is inconvenient to count.

In fact, counting chips is like a simple abacus. Zhu Zaiyu did not practice it himself, but asked Wang Yaozhuo to demonstrate the calculation chip to open an integer square, each small wooden stick, and each small square box. She only used it for a moment In the time of the clock, calculate the square root of 7 to seven decimal places.

"Abacus is faster." Zhu Zaiyu said earnestly.

"To talk about Zu Chongzhi's calculation of pi, that is, the density of a circle, we need to use the circle-cutting technique." After Zhu Zaiyu asked his apprentice to demonstrate the calculation of the formula, he was about to explain the circle-cutting technique. Zhu Yijun listened very seriously. Zai Yu spoke very thoroughly.

In fact, it is the infinite approximation of the inscribed regular polygon of the circle. The more sides the regular polygon has, the closer the circumference and area are to the circumference and area of ​​the circle.

This problem is transformed into how to find the perimeter or area of ​​a regular polygon. Zhu Yijun can understand that the side length of an inscribed regular hexagon with a radius of one is six, and the ratio of pi or the density of a circle is three, which is I have been using the Wednesday Path One.

Zhang Hong and Feng Bao couldn't understand the following content at all.

"Will you?" Zhang Hong asked in a low voice. He was a little worried. If Feng Bao could understand, he would never think about the position of his ancestor in his life.

Feng Bao said honestly: "No, it's like listening to the heavenly scriptures. Both His Majesty and Yuan Fu can understand it. You see, they will occasionally discuss with His Royal Highness. What is internal and external? don't know."

Your Majesty will ask, if you don't know what you pretend to know, you will be scolded.

"Zu Chongzhi is from the Southern and Northern Dynasties, it has been more than 1000 years ago." Zhu Yijun said with great emotion after listening to Zhu Zaiyu's explanation of cutting circles and Zu Chongzhi's algorithm.

Zhang Juzheng made some calculations and said: "Zu Chongzhi passed away 75 years ago."

The method of cutting circles has a strong differential thinking. Of course, it is not to draw a regular 12288 polygon to calculate hard, but to use the power rate of the twelve goblets to continue deriving. It only needs to calculate to a regular 384 polygon. Zu Chongzhi has iterated 11 times , Carried out 22 square root calculations.

Having said that, Zhu Zaiyu didn't stop, and continued, "Then it's Zu Chongzhi and his son Zu Dizhi who will deduce the volume of cones and spheres."

　It has been more than 500 years since Zu Chongzhi calculated pi and deduced the volume formulas of cones and spheres with his son.Sorry for being a bit late today, but it is still updated as scheduled, ask for a monthly ticket, woo! ! ! ! ! ! !
　　
　
(End of this chapter)