If you want to use exact words to describe the large number of gentlemen in Cuiyun, especially Zhang Chen and Lu Sanlang, then these two words can barely explain their mood and feelings.

When they were in the hall of Zhang's house before, even if Tang Ming and Xie Wanquan accused Zhang Shou of deceiving the world and stealing his name, Zhang Chen and Lu Sanlang felt that Zhang Shou was completely different from the "old gentleman" who had taught them in terms of height, shoulder width, or tone of voice.

After that, Ge Yong suddenly appeared again, and the two of them even wondered with surprise and joy whether they had actually worshiped this emperor, but they were just playing tricks on them, and they had only designed that conversation last night.

But now it's going around in a big circle, don't care who the "old gentleman" was last night, anyway, they were kicked to Zhang Shou by Ge Yong!

At this moment, Zhang Chen and Lu Sanlang were the leaders, and a large group of people were honestly sitting in the breeze and Xu Lai Hall, looking at Ge Yong and Zhang Shou, who were sitting across the small square table, talking about whether they understood or not, as if the arithmetic problem of the Book of Heaven was a problem.

Ge Yong is talking about circumcision, what is hooking three strands, four strings and five, and Zhang Shou is talking about infinite series, what is iterative method...... Until the last Arabic numerals were mentioned, but in just a few words, Ge Yong suddenly turned blue with anger, and Huo Ran got up.

"Those ghost talismans that came in from the barbarian land are also worthy of being compared to the calculation chips!"

Hearing this, the gentlemen were in high spirits one by one.

Could it be that this is just admitting the closed disciple, and in the blink of an eye, the teacher and the student fell out?

In this way, they can have a grudge to repay their grievances, and they can take revenge!

However, something unexpected happened to them, and they saw Ge Yong striding forward, pulling Zhang Shou's sleeve up, dragging the person up, and then ignoring their poor guys at all, and walking straight out.

Lu Sanlang, who turned his head boldly to look, even saw that when Zhu Ying hurriedly pulled out his legs to chase after her, the old man glared at her angrily.

"Old man, I'm going to discuss arithmetic with this kid, Xiao Yingying, don't come and join in the fun! I found out as early as when you were seven or eight years old, you are completely untalented in arithmetic!"

Zhang Shou saw that Zhu Ying was unconvinced and wanted to refute, so he smiled and said, "It's okay, it's just a little question about numbers." ”

To tell the truth, he had been staying in the countryside when he first discovered that Arabic numerals, which were really popularized in China very late in history, had entered all walks of life under the vigorous publicity of the imperial court in the early years of this dynasty, and at that time, he felt surprised and delighted.

Perhaps the ancient Chinese arithmetic method was very advanced, but it is definitely not a coincidence that the Arabic numerals from India were able to occupy the whole world, and even the Latin numerals, which once dominated Europe, were defeated, and finally developed into the most important part of basic mathematics!

But when the entire Ming Dynasty has gradually popularized Arabic numerals, there are still people who insist on using the symbol of the calculation chip as a means of calculation, for example, the old man Ge in front of him is a die-hard supporter of the calculation chip, he really didn't expect it.

Therefore, at this time, there was a breeze in the hall, and he was originally dragged by Ge Yong, and he glanced at Qi Liang who came out, and asked people to help Zhu Ying look at the scene, and then then pulled the old man to the Shuibo Buxing Pavilion in turn. He didn't speak, he took down the pen and paper directly from the bookshelf, and then spread it out in front of Ge Yong, dipped the pen in ink, and wrote a number casually.

It's not a difficult problem or a formula theorem, it's ...... Vertical square. Although it is left to future generations, it is a matter of a few seconds for a scientific calculator to enter it......

But at this moment, he listed a long list of calculations for Ge Yong in a vertical form. This is because he is extremely fast in mental arithmetic, and it only took him a few minutes to calculate the decimal place representing the root number ten. Hot Books

Immediately after, he came up with a faster iteration.

When he finally put two identical numbers in front of Ge Yong, he saw that the old man's face was as if it were covered with frost.

"Although the former calculation is paper-consuming, it has the advantage that it will not be like an abacus, which will have to be recalculated if it is messed up, and it will require countless calculations, and it is also easier to check than abacus. As long as you grasp the rules, the cumbersome is cumbersome, and the end is progressing step by step. The latter calculation is relatively convenient, that is, it takes a bit of effort to test the root, but in the end it is fast. It is easy to understand the numbers that have been transmitted from overseas. ”

He knew that Ge Yong might not be able to get over that hurdle in his heart, just like people who believe in traditional Chinese characters are the best in the world, often spraying simplified Chinese characters to the skin, not to mention Arabic numerals, which are completely foreign culture.

"Sir, when Zu Wenyuan made the Great Ming Calendar, the opponents clamored, saying that the calendar was made by the ancients, and it was not easy for eternity, but what did Zu Wenyuan say? We should not believe in the past and doubt the present, if the things of the ancient times were not right, and we still use them now, then we will not make mistakes again and again? Arithmetic, like the calendar, must keep pace with the times. ”

Zhang Shou said, he personally got up and went to the pouch to get a fairly warm teapot, washed the teacup, poured it for Ge Yong himself, and then smiled more sincerely.

"I was also a little interested in arithmetic because I had read a few books left by my husband, and the merchant who passed by happened to bring a few old books from the market, and I was even more interested when I saw those numbers that came from overseas that were simpler than arithmetic. If you think this is deviant, then I admit it. ”

Fortunately, when this Qingfeng Xu Lai Hall was renovated, the things inside were personally sorted out and moved out, and no one knew that the few sutras left by the old man were only scraps of paper, otherwise he didn't know how to end up!

"Admit your mistakes, but don't regret it, this is your attitude, right?" Ge Yong stared at Zhang Shou, seeing him nodding calmly, he was silent for a while with a cold face, and finally smiled.

"If you were so stubborn when I was living in seclusion here, I would have scolded you and walked away. But who made you master arithmetic to this level in such a short period of time, and still be able to teach Deng Xiaodao and Qi Liang, two talented and diligent students?"

As he spoke, he was a little excited: "I also know that over the years, I have insisted on using arithmetic chips, saying that it is based on the ancient system, but in fact, it is based on the old ways, and even the few old friends who are proficient in arithmetic have begun to use the numbers that have been passed down from overseas...... Alas, it's just that everyone is in the way of the face of an old man of my age, so they didn't say it to their faces......"

"It's just that you kid doesn't know how to respect teachers at all!"

When he said this, Ge Yong blew his beard again and glared, and when he saw Zhang Shou smiling and apologizing, he said with a straight face: "Your father-in-law invited me here, of course, not to teach you arithmetic, the book I deliberately left at the beginning included the ten books of arithmetic, purely because I was angry with you." But I heard Derpy say that you also have some skills in history, and you can't forget to read books, such a good qualification, don't waste it on miscellaneous things in the future!"

Afraid that Zhang Shou would pretend to be garlic, he added emphatically: "If you are greedy for appetite, just instruct others to do it, and the kung fu of cooking yourself is enough for you to ponder a lot of questions! If you can push Zu Wenyuan's diameter and circle ratio one step further, then I will have no regrets in this life, hey, I have not pushed it further for thousands of years, and even his "Decoration Book" has been lost!"

Zhang Shou hurriedly lowered his head and nodded respectfully in agreement, not wanting Ge Yong to notice the change in the expression on his face.

The subject of mathematics is broad and profound, and compared with those conjectures that no one has solved for so many years, pi is a problem that can be calculated by a supercomputer in modern times......

But to tell the truth, not to mention that the old man doesn't believe it, even if he believes it, he will definitely vomit blood, he still goes back to find some excuses for him to find lost arithmetic classics such as embellished books, and throws a few textbooks out for Ge Yong to have something to study, maybe it can make people rejuvenate a second spring?

And the next moment, Ge Yong, who was still a tireless mathematical researcher just now, suddenly changed his words.

"Tang Ming and Xie Wanquan, of course, were instructed to come over. Although I said that the old man had already been idle, my identity was involved, and I couldn't stay here for a long time, so I could only protect you for a while, and you and Xiao Yingying had to find a way to solve it in the future. Don't blame your father-in-law for leaving your mother and son in the countryside, there are some things you will know later. ”

"Be good to Xiao Yingying, although she is spoiled by her father, but her nature is good, it is rare to look at you, and her grandmother is behind her, don't let her down!