Seeing that the porter opened the side door, Zhu Ying hurriedly dragged Zhang Shou in, and Ge Yong's face was like the bottom of a black pot.

"Once or twice I didn't get in, this time it's better, I sent a bunch of books out directly in my name, and the beautiful words were shocking, but I still thought you were sincere and honest...... I'm!"

Seeing that Ge Yong was a little violent, Zhang Shou saw that there was a tall old man looking at him on the side, so he stopped Zhu Ying, who wanted to help explain, and raised his hand to Ge Yong deeply.

"Teacher, although I said that I had a whim, I gave books to those people outside in your name, but I also thought it through. ”

Zhang Shou said that he repeated the reasons why he had dissuaded Zhu Ying from stepping forward to pick up people, and seeing that Ge Yong's face was a little pale, he continued: "Even if this is just my speculation, not all of them may be people with arithmetic talents, but as long as there are really a few of them who are like this, and I can't stand the slander for a while, I will drive people away, won't it damage the reputation of the teacher's arithmetic master?"

"Dozens of books come from the bookstore run by Lu Saburo, and the cost is negligible, but if it falls into the hands of someone with a talent for arithmetic, it may be a guiding light for them. As long as there are ten or eight, no, as long as there are three or five people who can make the effort to really study in depth, then the way of arithmetic that the teacher has pursued all his life will not be alone!"

"This is indeed my own opinion, and I ask the teacher to forgive me!"

Zhang Shou kept calling the teacher, and the reason he said was really impressive enough, at least Ge Yong, who was just pretending to be angry, wanted to yell at his old friend when he was in a turbulent mood.

Look at the old man, my closed disciple's heart! I have been slandered by others, and I still think about people like this!

And what Ge Yong wanted to say, Zhu Ying immediately rushed to say: "Grandpa Ge, Grandpa Qi, I just wanted to not only drive away these troublemakers, but also wanted people to block the streets on both sides to register their names, and go back and tell the emperor about these people who violated the ban on the line! Now that I listen to him, I feel that I am fortunate that he is so broad-minded and thoughtful......"

"Hmph, who doesn't know what kind of temper Xiao Yingying has in you, as long as he can persuade you, no one can change it!" Ge Yong finally grabbed this step and stepped down the slope, and after snorting lightly, he said to Zhang Shou with a pleasant face, "Do things more leisurely in the future, my teacher is good-tempered, change to Lao Qi and Lao Chu, I know that you are messing around in the name of them, and you must be expelled from the teacher!"

Qi Jingshan, who had been silently beside him, finally laughed dumbly, and then said in a childlike tone: "Okay, good, you are powerful, your disciple is also better than my disciple, okay?"

Without waiting for Ge Yong to blow his beard and stare at him, Qi Jingshan smiled at Zhang Shou gently: "Today's farce, your response is really good. I didn't expect that you would not only be able to persuade the impulsive Yingying, but also use such a tactful and gentle way to move people's hearts. As for not entering the door twice, your teacher is just scolding twice, you don't have to take it to heart. ”

Ge Yong opened his mouth, wanting to say that the old man I was really angry just now, but thinking about it would damage the glorious image, in the end he could only snort coldly again and forcibly change the topic.

"Of course this kid has merit. I use deaf and dumb domestic servants in this house, and when you and the students of Old Man Chu first came, they stopped talking, looking suspicious and suspicious, thinking that I had a conspiracy. Hmph, these are all the old servants left by Emperor Ruizong, the Queen Mother personally named me and sent them to me, they are all clamoring to die in the palace, I will leave them, and I can still exert my residual heat!"

Speaking of this, he raised his chin and shouted to Zhang Shou: "Since you said something...... What kind of ciphers are designed with arithmetic? Well, that sounds like a novelty, tell me about the two old-fashioned ones here...... By the way, I haven't even asked you about the book just now, and suddenly a new book has been published for my old man!"

Seeing that Ge Yong couldn't wait to pull Zhang Shou over, Zhu Ying was stunned for a moment, and then couldn't help shouting angrily: "Grandpa Ge, Ah Shou is going to see my grandmother when he goes back, don't drag him because he wants to be something!"

I think that at the beginning, in order to calculate a problem, Grandpa Ge dragged his disciple who was the head of the household department at the time overnight, and almost missed the court!

"In the past, the ancients used objects to report emergency military information, such as a few inches long deed to represent what meaning, at most a few to a dozen meanings, but because sometimes it is necessary to convey specific information, so later a secret letter was often cut into three paragraphs for the messenger to transmit. ”

"During the Tang Dynasty, words that could be split were often used to convey information, but there were advantages and disadvantages to the word splitting method, because there were various forms of splitting. In the Song Dynasty, there was always a text test in the Wujing, which specifically stipulated that more than 40 kinds of military information could be conveyed with specific verses during war. ”

In Gefu's study, Zhang Shou took a thousand-character text and opened it casually.

"But now, if we add arithmetic, we use the thousand-character text as a codebook, and each word of the thousand-character text gets a number in order, from one to one thousand. For example, if we want to deliver a message, Huang Mu, then, we just need to find the number corresponding to these three words and write the number directly on the paper, which is a secret letter. Of course, this is the easiest ......"

Zhang Shou said as he smiled and wrote a random function f(x)=3x+1 on the paper.

"If it's a little more difficult, we can use this arithmetic formula to calculate the numbers corresponding to the three characters of Huang Musu, and then write the three words corresponding to the new numbers on paper, and then send them out in a letter. In this way, as long as the opposite side knows the formula, it can gently and skillfully reverse the original text......"

Facing two people who are proficient in arithmetic - of course, Zhu Ying, who is probing his brain on the side, can be ignored - Zhang Shou smiled and wrote a bunch of various functions from simple to complex on the paper, and then saw that Ge Yong, who was full of interest, immediately began to deduce the operation, not at all like a person who came into contact with functions for the first time, he knew that the teacher had read the book of functions that was listed first at the beginning.

Not only Ge Yong, but even the Mr. Qi on the side was also familiar with interjecting from the side, and it was clear that he had already studied it, Zhang Shou couldn't help but sigh in his heart, for this kind of arithmetic master, as long as he mastered the principle, many things could be easily touched.

However, when he saw Zhu Ying on the side glaring at herself angrily, obviously urging herself to hurry up and not delay going to Zhao Guogong's mansion, Zhang Shou was also afraid that Ge Yong would ask him about the origin of these books, so he smiled and said: "Teacher, I am entering Beijing for the first time, and I will go to Yingying's house to meet Mrs. Tai in a while, but it is not easy to collect elegant things for a while, I don't know if the teacher can send me a word?"

Ge Yong was thinking divergently, wondering if there was any other use for the function he had just come into contact with a few days ago, when he suddenly raised his head and said impatiently: "There are a lot of books on the desk over there, you can get them yourself!" ”

Zhu Ying saw that Zhang Shou actually hit Ge Yong with the idea of giving his grandmother's gift, and couldn't help laughing for a while. She was more direct than Zhang Shou, so she simply pulled Zhang Shou directly to rummage through the bookcase over there. When she found a picture of a rich peony, she only felt that the more she looked at it, the more she liked it, and immediately tugged at the corner of Zhang Shou's clothes, and then poked the picture scroll in her hand.

Zhang Shou suddenly laughed dumbly. This is for your grandmother, not for you! But thinking that the lady connived at Zhu Ying to this, he thought about it, and finally nodded: "Since you like it, pick this one and tell the teacher." ”

"Come on, don't talk nonsense, if you want to follow Xiao Yingying back to see her grandmother, go quickly! If you don't have a place to live, you can live here with me when you turn around......."

Before Ge Yong finished speaking, Zhu Ying dragged Zhang Shou out, and shouted as she walked: "Ah Shou's residence doesn't worry about Grandpa Ge, there is a guest room in Zhao Guogong's Mansion!"

What are you kidding, if Ge Yong drags Zhang Shou to study something, it may take ten days and half a month!