In the "Nine Chapters of Arithmetic", the calculation items about the volume of grain occupy a large space. Although there are Ye Mengqiu brothers who feel that it is difficult to buy even "Nine Chapters of Arithmetic" on the market, among the astronomical and mathematical talents who were called to Beijing this time, there are also family roots, so they have grown up under the influence of various arithmetic scriptures since childhood.

Therefore, when they heard that Zhang Shou actually used the way of pretending to be millet in public to show such an arithmetic problem, they couldn't help but look at each other when they were arranged to sit together. And Zhang Shou next, asked Ah Liu to bring a blackboard, and calculated the volume of a standard Guanhu on the spot, which was nothing to them.

What surprised them was a series of bulk density data for different types of grain given by Zhang Shou next.

From indica, japonica, wheat, barley, sorghum, corn, soybeans...... A group of people who have always believed that astronomy is a profound science can see that arithmetic is related to the granary, and it can be used in this kind of place, which is not bad.

"Why do you need to count bulk weight? Very simply, the grain measured by Guan Hu has the same volume, once there is a difference in bulk density, then the final weight will be different. Among them, it is related to the moisture rate, the grain storage time, and the grain storage temperature......"

Seeing Zhang Shou write and draw on a blackboard again, he told the height of the grain pile measured by himself in his own granary in Rongshui Village half a year later, a year later, and a year and a half later, which verified that the gap between grain particles decreased, and the bulk density increased, and finally came to the conclusion that the same grain was heavier than the new grain.

For those derivation processes, what is the force decomposition, everyone at the bottom only thinks that what Zhang Shou said at the beginning will be simple and easy to understand today, and it is simple to understand, it is simply a pitfall! The first demonstration is very simple, but the latter thing they can basically only understand one conclusion, and the rest is completely incomprehensible!

Not to mention them, even the three of them, Yue Shanchang and Xiao Shanchang, who were quite knowledgeable, only felt that the smiles on their faces were a little stiff at this time.

Although they specialize in art, they also need to calculate when they build ditches and water conservancy, garden design, boats, etc., but they all seem to be carried forward on the basis of their ancestors.

And Ye Mengqiu, who had already prepared, directly took out the prepared paper roll, one senior brother was responsible for grinding ink, and the other was responsible for stretching paper, while he dipped his pen in ink and quickly took notes.

Even if what Zhang Shou wrote on the blackboard was completely invisible from his point of view, Zhang Shou wrote while talking, and he had already experienced Jiuzhangtang and Zhang Yuan, listening attentively, and moving the pen like flying, he could even catch up with that speed. Faced with this scene, it was a little embarrassing for the other special talents who were proficient in astronomy sitting near them.

The cheat sheet was prepared by someone, and someone brought the calculation plan, but at this time, no one thought that they could remember what Zhang Shou said next. Some people are self-respecting and don't want to ask others, but some people immediately greet Ye Mengqiu's senior brothers, and when Zhang Shou stopped this part of the lecture, several people had already negotiated the matter of going back to borrow notes.

But as a result, Ye Mengqiu, who was rubbing his wrist after stopping his pen, said something that made them excited and hesitant: "What's the use of just copying notes? What Master Zhang is talking about now, he will definitely talk about it in detail in the Jiuzhang Hall in the future. I'm going to go back and take the Jiuzhangtang exam, didn't he say to the four princes before that Jiuzhangtang can skip a grade? ”

That's right, the third prince went to the Jiuzhangtang exam in person before, and now although he can't continue to take classes in the Jiuzhangtang because he was canonized as the crown prince, the emperor not only ordered Zhang Shou Donggong to lecture first, but also selected the outstanding ones in the Jiuzhangtang to study in the East Palace!

If they can get in, then try to skip a grade...... Wouldn't that also be among the East Palace?

Even if they heard the news of the reopening of the Nine Chapters Hall, a group of special talents who were still reluctant to join the Nine Chapters Hall were a little delicate. Especially at the invitation of Ge Yong, the elders who discussed arithmetic with Zhang Shou in Gefu felt that their faces were a little unbearable. After all, not to mention the rest, Zhang Shou readily admitted at that time that he really didn't have much research on astronomy.

They have to participate in the Four Seas Test, redefine the calendar, and they are proficient in all kinds of astronomical phenomena, and it would be too embarrassing to go to Zhang Shou, who claims to be unfamiliar with astronomy, to ask for advice!

As a result, the eyes of several elders fell on the juniors. Well, Ge Yongna is also an old-timer for them, even if they are humble, they should have a relationship with Zhang Shouping, as for these young juniors, then they might as well throw them away from Jiuzhangtang and see if they can learn some novel things from Zhang Shou.

Young people, that is, they should always learn!

Zhang Shou didn't have much preparation in advance for this open class, but with a pat on his head, he decided to use this open class to add another fire to the agricultural policy of the third prince. At this time, from the perspective of bulk weight, he talked about grain storage and seed selection, and then turned back to the density and began to talk about the identification of gold and silver adulteration, including the so-called story of Danshi defrauding money in the name of burning silver.

Jiuzhangtang and Banshantang had long been accustomed to the various examples that this teacher had at his fingertips, and after giving examples, they began to frantically cite various formulas and laws to calculate and prove. However, the rest of the people who came to the lecture today had never experienced such a complete baptism.

For example, Zhu Hong breathed a sigh of relief at first, feeling that Zhang Shou finally understood that the people who came to listen to the lecture were all laymen, but when he heard this, he almost wanted to cover his ears to isolate the magic sound. He even turned his head sideways to look at Zhu Ying several times, only to see that the eldest lady was always full of interest, and while listening, he gestured in Zhang Shou's subdued tone, telling him to muttered in his heart that Xi Shi was in the eyes of his lover.

Replaced by the eldest lady who hated reading the most in the past, she would have fallen asleep on this occasion a long time ago, or did she slip away?

Finally, Zhu Er, who was behind Zhu Ying, poked his sister's back with his finger, and then lowered his voice and asked, "Yingying, do you understand?" Could it be that my brother-in-law has been teaching you all these days? ”

"Nope!" Zhu Ying raised her eyebrows slightly, but did not explain whether her answer was aimed at Zhu Er's previous question or the latter question. She glanced back at the people behind her, and saw that a person was all full of bitterness, and the expression on that face seemed to say, where am I, who am I, what am I doing, she can't help but smile.

"Look at the other people like that, it's good!" Including you goofy geese!

Besides, she didn't come to pick on the thorns anyway, nor did she come to see if there was a chance to get close to the three princes, nor did she plan anything else...... Isn't it interesting to watch Zhang Shou change his way to toss these people who listen to the lectures?

The eldest lady is very good at having fun by herself, she is happy, but more people are getting more and more dizzy and dizzy. Among them, when this class finally came to an end and Zhang Shou announced that he would leave the class, I don't know how many people breathed a sigh of relief.

Next time...... Definitely not coming!

Even if you want to question it, you have to find out what people are saying first, but they only understand what those people say, and as for understanding those ghost-like heavenly books, it is simply difficult for strong people!

Even Zou Ming, who had received Zhang Shou's life-saving grace, couldn't help but rub his temples with palpitations, and then said with a bitter face: "I really didn't expect that arithmetic could still be used on these things...... And it's so difficult and difficult, I just felt like I'm listening to a book from heaven! ”

His two companions, when you look at me, all think that the hero sees something in the same way. Not only them, Song Juren on the side gasped exaggeratedly, shook his head and said: "It is said that life and death are great horrors, but I used to think that practicing the art of literature and art all day long is a great horror." But now I finally realize that there is such a greater horror in the world as arithmetic! Horror, horror! ”

Fang Qing was almost amused by Song Juren's words. But he turned his head to the side and found that Yang Zhan and Guan Qiu on the side were whispering. Neither of them is a person who studies arithmetic, and they didn't bury their heads in taking notes like Ye Mengqiu just now, but thinking that Zhang Shou has always praised the two of them for their extraordinary talents, he still couldn't help but ask: "Yang Qigongzi, Xiaoguan, do you understand?" ”

"Nonsense!" Yang Zhan, who was no longer skinny, rolled his eyes directly, but then said stupidly, "Of course I didn't understand!" ”

He said and added: "How long have I learned to calculate the scriptures, how can I understand this, I don't even understand how to calculate the volume of that official hu!" But Xiaoguan seems to have gained a lot, and it's no wonder that he has always been self-taught! ”

Guan Qiu was a little embarrassed to be stared at by everyone, he laughed, and then whispered: "The bulk density of various grains was originally calculated by Brother Zhang when Brother Zhang asked me to go and measure it, and he also wrote down the data. He said, "It's just a test, and I didn't expect him to talk about it in a public class......"

Before these words were finished, the others held their foreheads, sighed and shook their heads, who would have thought that a kid from a carpenter's apprenticeship would be the only one among them who could not only understand, but also participated in Zhang Shou's experiment early?

A few people are different from Zhang Chen and Zhu Ying, they were originally sitting in a large group of special talents in astronomy, at this time, unlike the pale people who fled in the wilderness, most of them did not leave, of course, there were people who heard them talking, and someone asked out at the moment.

"Dare to ask who this little boy is taught by, does he also live in Zhang Yuan? If it's convenient, can you ask for advice in the future? ”

Unexpectedly, someone wanted to discuss academic issues with him, and Guan Qiudeng was dumbfounded.

It took a long time for him to scratch his head and say with some embarrassment: "I'm not a scholar, I'm just a craftsman." ”

"Yes, yes, it's just a craftsman, or I have been praised by the emperor, and I personally say that I am worthy of being a craftsman."

Song Juren on the side couldn't help but complain, his face was full of sincerity when he saw the invitation of the guy who opened his mouth, and when he heard that Guan Qiu was just a craftsman, he immediately frowned, although he didn't show disdain, but in the end he showed a contemptuous expression, but after listening to his own words, his face was shocked, and he couldn't help but sneer secretly in his heart, he was simply a face-changing madman.

He simply said unhurriedly: "Don't talk about Bachelor Zhang's experiment today, even many things made by Bachelor Zhang before are inseparable from Xiaoguan." For example, what spinning machines, looms, table clocks, glass ......"

Before he could finish speaking, Fang Qing next to him coughed heavily. At this moment, Song Juren immediately realized that he had revealed the news that should not be revealed, and immediately shut up. However, if you want to take back the water that you spilled out of the words, it is impossible to take it back, and the person who asked Guan Qiu just now was like a treasure, and immediately asked him.

"Oh, this master Guan turned out to be the one who made so many clever weapons single-handedly? Why hadn't I heard his name before? As we all know, whether it is a loom or a spinning wheel, or a table clock or glass, I have only heard that it is the creation of Master Zhang. Isn't he suspected of deceiving the world and stealing his name? ”

As soon as these words came out, Song Juren chuckled in his heart, knowing that the ostentatious change he had just made seemed to be in trouble.

However, before he could organize the language to fight back, he heard Guan Qiu's voice, which had always seemed very honest: "This son, have always been those buses, hoes, sickles, canals, etc., are they really all built by the prince in the name?" I guess it can't be. Whether it is a waterwheel or a farm implement, it must have been built by a blacksmith carpenter according to the drawing style. As for the canals and embankments, the real builders are a huge number of people...... But so what? ”

Guan Qiu, who had never liked to speak, stared at the young man with an extremely unnatural face, and said word by word: "Can that hide the great merit of the person who knows how to improve the design of farm tools?" Can that erase the reputation and evaluation of the initiator who personally presided over, raised funds, and organized the people to build various water conservancy ditches and facilities? ”

"Some of the things that Song Gongzi said just now did I contribute a little insignificant strength, but it was not all my credit, but more of the credit of Fourth Brother Zhao and Senior Brother Luo. The most important thing is that the inspiration at the beginning was all thought up by Brother Zhang! The person who said that he deceived the world and stole his name, that is the belly of a gentleman with the heart of a villain! ”

Seeing that the young man's face was already blue and white just now, especially when he was evaluated as a villain, he couldn't sit still anymore and simply got up and hid his face and left, Guan Qiu put away his anger and smiled honestly: "The spinning wheel that has just been promoted now is improved by my senior brother Luo Xiaoxiao, and the glass has made a great contribution to Fourth Brother Zhao, and it has nothing to do with me." I mainly did small things with looms and clocks. But I still say the same thing, this is more due to Brother Zhang. ”

"When he encouraged me to read, he said something that I couldn't agree with the most. Knowledge is power! ”

What is called loud and deafening, Song Juren finally realized. Radiant, he glanced at the guy's companion just now, and saw that those people all avoided his gaze, but there were several other people who were obviously not a group of people who gave Guan Qiu a thumbs up, so he smiled and said: "Xiao Guan said this very well, I really should let everyone listen to it!" ”