In Ge's study, the emperor who was out of the way, Ge Yong stared at Zhang Shou, and the angry expression on his face just now disappeared, replaced by a smile. He even touched Zhang Shou's head as if he had teased his little grandson before, and seeing that the disciples who had closed the door were a little embarrassed and hurriedly dodged, he didn't think it was angry.

"You swept the Jiuzhang Hall last night, and this act of making trouble can be regarded as offending many people in the country. But today someone came out to denounce Zhou Xun, you didn't fall into trouble with him because of a little grudge, but not only did you clear up the relationship, but also made Zhou Xun have to remember your feelings, do a good job, and don't embarrass my old man! ”

"And telling lies to the emperor, out of kindness, and I also know that I can finally make up for it."

Zhang Shou suddenly secretly called it a fluke. At that time in Guozijian, although he found that the emperor didn't seem to hear the flaws in his words, but in line with the principle of prudence, he really planned to go back and ask Ge Yong to help hand over a letter of apology!

He felt that whatever he said at this time was a bit of a flaunting of his own taste, and he could only laugh dryly at the moment.

And Ge Yong obviously didn't mean to hold on to such a thing, after all, the stubble that the emperor said, he couldn't pull Zhang Shou's helper, but he was very interested in Zhang Shou's method of determining whether the plaque was hollow!

"Since the emperor asked me to determine whether the Taizu plaque is hollow or has a dark grid, then I have to ask you about the principle of this method first. If it is really easy to use, it is only used to deal with a Taizu inscription plaque, making a big fuss, and determining whether someone is counterfeiting gold and silver ingots when casting gold and silver ingots, then it is the most effective. Tell me how you came up with it. ”

Zhang Shou could only laugh dryly. Isn't Archimedes' law the law that Archimedes came up with after pondering for a long time when judging whether the crown was pure gold?

He thought about it for a while, but decided to explain it carefully: "Teacher, whether it is gloomy wood or gold or silver, as long as the same material and weight are the same, then they should be the same size. But because the shape of these things is not as regular and neat as the Yangma turtle and the like mentioned in the Nine Chapters of Arithmetic, it is impossible to calculate the actual size. ”

Ge Yong, who claimed to be a master of arithmetic, of course understood what Zhang Shou meant, and after a little thought, he nodded and said, "It makes sense, continue to talk." ”

"Since we can't calculate the size, we have to use other methods to calculate and compare. Therefore, water has become a very convenient criterion. Because an object of the same size enters the water, then the size of the drained water should be the same. In this way, by notching the edge of the pool, it is easy to compare the actual size of the object......"

Zhang Shou said while thinking that in order to fully explain this principle, mathematics alone is not enough, simple physics knowledge and even terms such as mass, density, volume, buoyancy, etc., it is necessary to come up with them, otherwise it will undoubtedly take a lot of effort to explain it to people who are not proficient in arithmetic like Ge Yong in the future.

The same is true for the awkward terms in the nine chapters of arithmetic, it is best to ask Ge Yong to publish this book and promote related terms such as quadrangular pyramids, triangular pyramids, rectangles and cubes, otherwise it is really unintuitive just for yang horses and turtles and the like.

Just like Luo Siye, Xu Heizi and those Dr. Guozi, when the idlers saw and heard those two words, they were completely confused.

And Ge Yong had already suddenly realized: "Very good, I understand." If the plaque is not gloomy wood, but cork such as golden silk nanmu, it will be much more troublesome, and you will have to tie a heavy object into the water. Of course, this method cannot be completely accurate, but can only be said to be roughly accurate, because when an object enters the water, it is easy to splash, and when it comes out of the water, it is easy to carry out water droplets, and the scoring may not be accurate. ”

"That's what the teacher said." Zhang Shou smiled, and then couldn't help but yawn again.

"I'll go back and ask someone to arrange it to determine whether the Taizu plaque has a hollow secret grid as soon as possible...... To be honest, I don't think so. ”

Zhang Shou thought secretly. I also don't think so, otherwise how could Taizu leave a room full of handwriting in the palace, and still make eunuchs like Chu Kuan treat them as treasures and pass them on from generation to generation?

Ge Yong said the right thing, and then snorted dissatisfiedly: "By the way, Xiao Yingying also followed the emperor before, but I drove her back, she placed your mother in Old Man Qi's house last night, hum, ungrateful little girl!" ”

Knowing that his mother did not live in Zhao Guogong's mansion, Zhang Shou couldn't help but thank Zhu Ying, who seemed to be very arrogant. He who had read all the thousands of sails could not care about the wealth of the Zhao State Mansion, but it was difficult for the Wu family to do it. It's really difficult for the eldest lady to be so delicate.

After a change of thought, he hurriedly asked Ge Yong: "Teacher, what about Ah Liu, Xiao Qi and Xiao Derpy, which I brought before?" ”

Ge Yong said excitedly: "It's all outside the door, I ordered to take them to the guest room, but the two insisted on waiting for you outside with Ah Liu, obviously not worrying about you." ”

Hearing this, Zhang Shou hurriedly went out, and immediately called the two of them into the house with Ah Liu.

Before he could deliberately bring out Deng Xiaodao to introduce Ge Yong, he got a cold snort again: "Don't come to this set, Xiao Qi I have seen it before, and I have already seen it, otherwise I know that there is a closed disciple like you in Rongshui Village?" Last time I found out in Qingfeng Xu Laitang, the old man of the Lu family seems to have a bit of arithmetic talent, I just heard the emperor say, not to mention a little, you are really lucky! ”

"I'm angry, my old man nominally accepts so many students, except for you kid, the head of King Yin of Shuntian Mansion, who has a half-apprenticeship, can't find a few who have arithmetic talent - even if they do, they are all busy being officials and progressive, but your kid can easily meet three!"

Zhang Shou didn't expect that Teacher Ge, who was full of peach and plums, was jealous of his students' luck, and there was no other way but to laugh, but because Ge Yong thought of Wang Datou, he suddenly remembered another thing, and immediately pointed at the unfilial disciple and continued to spray.

"King Yin of Shuntian Mansion sent a letter to me this morning, saying that he summoned Derpy last night, and Derpy also offered a bar chart and line chart, saying that the statistics of taxes, population, income, and expenditure are very intuitive, and you made it up, right? I don't know what new tricks are there to show me as a teacher first, you're addicted to cutting and then playing, aren't you? ”

Didn't I have time to go back to the village last night? I didn't expect Deng Derpy to be a mere order to see him, and I didn't expect Deng Derpy to move so fast......

Zhang Shou thought so in his heart, but he could only helplessly glance at Deng Xiaodu, who was weak and bowed his head, and then stood obediently and was sprayed, and finally hurriedly promised that if he had new ideas in the future, he would discuss with the teacher first.

With such assurance, Ge Yong finally let out a sigh of relief, and sighed softly with satisfaction. When Deng Xiaodao was a little frightened and proposed that he wanted to go back to the Shuntian Mansion, and Qi Liang also said that he wanted to go back to see how the Wu family was settled, he generously waved his hand and asked the two to leave first. As for Ah Liu, who was motionless in the corner with the wooden pestle, he glanced at it and ignored it.

"Ah Shou, you remember, in the future, whether it is someone or something involved in the four words of Emperor Taizu, you will not touch it. Except for the incident of the Taizu inscription this time, after all, you were inexplicably involved. ”

Zhang Shou didn't expect Ge Yong to warn himself that he would stay away from Emperor Taizu's related matters, so he couldn't help but be a little surprised. However, he was waiting for Ge Yong to explain further, but the emperor of the current dynasty coughed dryly and diverted the topic.

"Xiao Qi's ranking in the palace test, if it weren't for the big head of King Yin of Shuntian Mansion who refuted many people in front of the emperor to the extreme, maybe he would be slandered. I don't know how long he can last in the entrance examination, so it is very important whether you can stand on your feet in Guozijian, so I praise you for your actions in Guozijian today. ”

"Wang Datou's arithmetic talent is quite good, and even half of your senior brother, after Derpy goes back today, he will definitely tell Wang Datou about your Taizu inscription today, hey, compared to the line chart column chart, this method of determining whether something is hollow and whether it is doped is more interesting!"

Zhang Shou suddenly couldn't cry or laugh. My teacher, I'm waiting for you to say Emperor Taizu, you actually give me a lot of talk, what do you say about the entrance exam, what do you say about gaining a firm foothold in Guozijian, and what do you say about Wang Datou?

You're too blunt to divert the topic, aren't you?

He thought about it, and simply didn't ask about Emperor Taizu, and said with sincerity on his face: "Teacher, last night in the Jiuzhang Hall, Lu Sanlang took the Yang Ma and the turtle in the Nine Chapters of Arithmetic, and asked Luo Siye and a few Guozi doctors, and Xu Jiancheng of the Rope Hall speechless. Although this is because they don't read the scriptures, it is also a reason why the words used in the scriptures are too complicated. ”

He paused for a moment and said with a smile: "Can the teacher, in the name of the Grandmaster of Arithmetic, introduce a manual of simple terminology and symbolic calculations of the Ge family?" ”

Hearing this, Teacher Ge's eyes lit up at first, and then he glared at his closed disciple with some subtle gaze.

If I say I don't want to, you're going to publish a book in my name, right?

He snorted and said disapprehantly, "Okay, you can tell the old man first!" ”