(Thank you for the recommendation of the book friend who will always exist in the starry sky and the steady happiness - Li Chaolian, and your suggestions.) Pen, fun, pavilion www. biquge。 info）

Two days later, Fusu began to ride out on horseback. After another 20 days, the household registration statistics around Xianyang were finally completed, and the Langzhong gathered again at Sixian Yuan in Fusu to summarize the problems that arose in their work, discuss them, and propose solutions.

Sima Hong was invited by Fusu again, and Fusu didn't want the teaching of new numbers a month ago to lose its effect, so he wanted to consolidate the knowledge of new numbers for Langzhong through the summary meeting of Langzhong. Sima Hong appeared in front of Fusu with an assistant who was less than thirty years old, and introduced Fusu to the book, and he found a genius in magic.

"Zhang Cang has seen Gongzi." This assistant saluted Fusu very respectfully.

After listening to Zhang Cang's words, Fusu felt that he had heard his name somewhere, and he couldn't remember it for a while, so he asked: "You are interested in mathematics, I don't know if you have a teacher?" ”

Sima Hong heard this, but he laughed, and said beside him: "Does Childe think that he is a sorcerer or a descendant of the Yin and Yang family, then he guessed wrong, this Zhang Zuocheng is from the same door as Childe." ”

Fusu's heart moved when he heard this, and he seemed to know who this Zhang Cang was.

When Zhang Cang heard Sima Hong's words, he said with a smile on his face: "Cang studied under Xunzi, but he was only interested in miscellaneous studies such as craftsmen and artists, but he insulted the prestige of the teacher and the two senior brothers. ”

After Fusu heard this, he said in his heart, and sure enough, he bowed to Zhang Cang and said, "Sure enough, it's Uncle Shi!" ”

"Fusu has long heard Master Li say that I have an uncle, who neither likes Confucianism under the sect of Shizu, nor does he want Master Li to become a Legalist like Uncle Han, but is well-read and knowledgeable, and is keen on all kinds of miscellaneous studies, especially for "Nine Chapters" and "Zhou Ji", which can be called everyone. Fusu had a thought of seeing it for a long time, but he didn't know where his uncle went, and he didn't know that his uncle was an official in Qin State. ”

"I don't deserve such praise from the son, the technique of Cangwei Mo is really inadequate compared to the two senior brothers." Zhang Cang is still modest.

"Uncle Shi doesn't have to be modest. When did Uncle Shi arrive in Xianyang? Two years ago, Li Shi told me that it was a pity that you were not in Xianyang, otherwise I could learn some things from you. Fusu asked.

"After Master Xun died, in order to confirm what I had learned, I traveled around the world, communicating with warlocks and Yin and Yang families, until last year, when I felt that I had achieved a little success, I found my senior brother and entered the Taishi Academy as a Cheng under his recommendation."

Sima Hong sighed beside him: "Xunzi is worthy of being a great Confucian, not only is he knowledgeable, but his disciples are also their own strengths, no less than the heirs specially cultivated by each family, but unfortunately Xunzi failed to meet him when he came to Qin!" Childe, don't you know, your uncle has never revealed his arithmetic skills in me, only with astronomy, the calendar has overshadowed many ministers of the Taishi Academy, if it is not a coincidence to see me use the new number to calculate, after a while I will learn the new number of mathematics, and ask me a lot of questions that I can't answer, I know that he has such a great talent, let him come over as an assistant, otherwise Childe may not see him. ”

"Lord Sima is overrated!" Zhang Cang smiled bitterly, Sima Hong's words gave people the illusion that Zhang Cang deliberately concealed his talent and disdained to compare with ordinary people.

Fusu listened to Sima Hong's words, but he was interested, and it may not be unusual to be able to learn Arabic numerals so quickly, but Li Sike once told him that this Zhang Cang is also quite successful in "Nine Chapters of Arithmetic" and "Zhou Ji", these two things together, it is amazing, thinking that he is about to discover an ancient Chinese mathematical talent. Fusu didn't know that in the old time and space, Zhang Cang was not only very successful in magic, astronomy, and calendar, but also politically insightful, he was the first scientist in Chinese history to propose the abolition of corporal punishment, and he was the prime minister of the Han Dynasty for more than ten years, and it was not Zhang Cang's wish to be a mathematician.

Fusu couldn't participate in the summary meeting of Langzhong, and handed over these things to Li You, so he led Zhang Cang and Sima Hong to find a pavilion and sit down, and ordered Meng An to prepare paper, pen and ink, and began to discuss the art of arithmetic. The result did not disappoint Fusu, in the mathematics teaching a month ago, Fusu had hesitation, afraid that his mathematical concepts were too advanced, so that people at this time could not accept it, and the communication with Zhang Cang made Fusu completely relieved.

Zhang Cang is worthy of being a professional mathematical talent at this time, not only can solve the application problems of chickens and rabbits in the same cage proposed by Fusu, but also makes Fusu dumbfounded in mathematical theory, there is no need to mention the pediatrics of the ninety-nine multiplication table, fractions, positive and negative numbers, decimal numbers and other things that Fusu did not dare to involve in the teaching of Qin at the beginning, it is all a piece of cake here in Zhang Cang, when it comes to the Pythagorean theorem, pi and other content, Zhang Cang can barely cope, even if there are some small problems, as long as Fusu explains a little, Zhang Cang can also quickly understand, It can also be explained in the current terminology of the pre-Qin period.

In the course of the exchange, Fusu inevitably mentioned the craftsmen and workshops that "invented" new numbers, and it turned out that Zhang Cang was also very researched in the affairs of the workers. Fusu remembered that Sima Hong said that Zhang Cang was also very proficient in astronomy and calendars, and made some temptations, but Fusu, who only "knew what it was, didn't know why" of advanced astronomical calendar knowledge, was not Zhang Cang's opponent at all.

In the next few days, Fusu proposed to sort out the mathematical theories that Zhang Cang exchanged with him and compile them into a book as a teaching material for future arithmetic teaching. Zhang Cang saw that Fusu was so attentive to engineering and art, which had always been regarded as miscellaneous studies, and that he had achievements that made him breathtaking, so he immediately readily agreed, not knowing that Fusu had transferred him from the Taishi Academy to his own mansion through Li Si to serve as the crown prince.

Ten days later, after the Langzhong people finished repairing, they were going to the counties of Qin State to train and lead the household registration statistics, and after the young Fusu sent away the last group of Langzhong groups, it had nothing to do with the next household registration statistics.

Fusu devoted himself to the compilation of textbooks, in addition to inviting Zhang Cang and Sima Hong to compile technical textbooks together, Fusu invited Cheng Qu and Mo at the same time, so that he could find out some basic physics knowledge that was easy to understand and learn from the Mohist classics for new compilation, and at the same time, after Fusu applied to Ying Zheng, he invited some Confucian scholars who were usually the least popular with him, and asked them to compile some things. Under the dispatch of Fusu, the shops under Fusu's name fully provided various support for the compilation work, and it was obvious that Fusu was preparing a bigger plan than household statistics.

"Teacher, what do you think of this training?" Tingwei Mansion, Fusu respectfully asked Li Si for advice.

"Be prepared and get twice the result with half the effort." Li Si praised Fusu's first political involvement.

From the beginning of Fusu's proposal for the "first order of the men's book year", changed to household statistics, to the final Langzhong training, after the end of the statistics, there is a unified summary, each step is closely connected, step by step, it is very smooth, there is a feeling of natural success. Not to mention that in the process, the household registration book designed by Fusu, the year of the Yellow Emperor proposed, and the personal participation in Xianyang's household registration statistics and other highlights. It can be said that such a successful start can be regarded as a successful start, and Fusu's subsequent political career will definitely be smooth.