"No, no, no! This knowledge point should not be included in this enlightenment textbook. It is too deep for those who have just been enlightened. For these people, it is already rare to be able to skillfully use the four operations of addition, subtraction, multiplication and division!" Zhang Zong stopped Lu Chuan again.

Lu Chuan originally asked Zhang Zong to give his advice, so after hearing this, he immediately crossed out a knowledge point in the book, and then discussed the next knowledge point with Zhang Zong.

Zhang Zong has accepted the position of bachelor's degree in mathematics, and he doesn't have to attend classes anymore. He just needs to give some advice on Li Dan and Xue Shao's academic studies in mathematics. Compared with the lazy Zhang Zong, Lu Chuan is too idle. Now he plans to write an enlightenment textbook for symbolic operations, which can be published in the future to the court to promote it nationwide, so that more people can master the skill of mathematics.

During this period, Zhang Zong also communicated with Lu Chuan about many mathematical problems, which gave him a clear understanding of the current mathematical situation. In fact, mathematical knowledge in the Tang Dynasty was very developed. For example, in the Ten Books of Arithmetics, mathematical terms such as numerator, denominator, square, cubic, positive, negative, and equations have appeared, which have been used until later generations.

However, there is also a big problem in math, that is, the polarization is very serious. Top mathologists have very profound research on math. Many problems that Zhang Zong is confused about are also solved. It can be said that their in-depth research on math is far beyond Zhang Zong's level.

But on the other hand, the people at the bottom know much about math. Math is different from Confucianism. Math is a practical science that affects all aspects of people's livelihood. However, for most people in the Tang Dynasty, they could not even calculate the accounts.

One of the main reasons why teeth are so common is that ordinary people need to rely on teeth to help them calculate transactions, otherwise they may not know that they are cheated by others. Of course, teeth are not completely reliable. If you encounter a person with poor character, you may be able to eat the next house and take advantage of both ends after eating. This is also the reason why teeth have such a bad reputation.

The main reason why ordinary people do not understand the simplest arithmetic is education, and the other is the problem of math itself. Because in the past, if you wanted to learn math, at least you had to read, but under the educational conditions of the Tang Dynasty, literacy was a very luxurious thing for ordinary people.

However, now there is a solution. Zhang Zong proposed a symbolic operation, replacing ten numbers with simple and easy-to-learn Arabic numerals, and adding, subtracting, multiplication and division are also replaced by symbols. It cannot be said that it is completely separated from words, but generally simple operations are almost useless. As long as you learn these limited few symbols, you can cope with most operations in daily life.

It was also under this situation that Lu Chuan wanted to write a math enlightenment textbook so that more people could learn daily operations. For a bachelor who has a respectable status, he could always keep the people in his heart. Zhang Zong was very impressed, so he agreed to write it for him.

Lu Chuan had already written a framework before. Now Zhang Zong only needs to check and delete some unnecessary content. Zhang Zong also tried his best to control these contents in the first grade of elementary school in later generations, as long as he could handle daily operations.

In the afternoon, Lu Chuan had to attend classes, so Zhang Zong was too lazy to go, so he went home on his own. Since he became a bachelor's degree, he has become more leisurely than before, and he can leave as soon as he wants to come. He is simply too free.

"Young master, that fake Persian came in the morning and took away all the two-color roses he bought last time and settled the account." As soon as he returned home, Wan'er immediately smiled and reported that although she didn't like Li Qi, the other party came to give money. Now Zhang Zong handed over all the financial powers at home to her and gave her the room keys to the money. This morning, she counted the freshman morning just by counting the money.

"Did he say anything?" Zhang Zong couldn't help but smile when he looked at Wan'er's wealthy appearance.

"He said that news came from the Western Regions yesterday that the Ni Nirvana Master wrote a letter and asked me to pass it to the young master!" Wan'er said as she took out a letter and sent it to Zhang Zong and said.

Zhang Zong was also very happy to see that it was written by Ni Nishima. The Western Regions were too far away and communication was very inconvenient. Sometimes a letter might take several months to deliver to the other party. The last time he received Ni Nishima's letter was more than a month ago, and that time it was the other party's letter to report safety.

Zhang Zong opened the letter and carefully read the content on the letter. It was normal at the beginning. It was nothing more than a battle of wits and courage with his soldiers. He wanted to deal with his subordinates' thorns, but the effect did not seem to be very good. After all, these people are all veterans, and it is impossible to buy them with some favors.

However, the second half of the letter tells the first battle the Ni Nishima experienced when he arrived in the Western Regions. This was actually a very small conflict. It was nothing more than two tribes under the Tang Dynasty. Due to the conflict between interests, the Tang Dynasty's garrison went to mediate. As a result, a tribe was red in his eyes and actually attacked the Tang Dynasty's army.

This really made a fuss about Mafengwo. With the order of the general, the Tang army, who had originally gone to mediation, immediately rushed into the battlefield and wiped out the brave tribe. All the young men in the tribe were slaughtered, and a tribe of thousands disappeared.

The Ni Ni Niizhan went to the battlefield for the first time, and it was also the first time to kill people. As a result, when he saw the enemy whose head was chopped off his body fell under his feet and blood sprayed his face, the Ni Ni Niizhan felt a strong sense of disgust and even vomited it out on the spot. If it weren't for the protection of the guards he brought, he might have been killed by someone at that time.

However, even if someone protected him, Ni Nirvana was still injured. An arrow penetrated the gap in the iron armor and shot his right arm. Fortunately, the injury was not serious, and it would be fine if he was raising it for a few days.

In the end, the letter was almost all about the thoughts of Ni Ni Niizhan after participating in this battle. Although he was very embarrassed, he could feel the excitement in Ni Niizhan. He even said in the letter that he now feels like he is reborn. It seems that after experiencing the training of the war, he has grown up all of a sudden and his mind is stronger than before.

"The battlefield is indeed a good place to hone people!" Zhang Zong couldn't help but sigh after reading the letter from Ni Ni Ni Ni Ni Ni Ni Ni Ni Ni Ni Ni Ni Ni Ni Ni Ni Ni Ni Ni Ni Ni Ni Ni Ni Ni Ni Ni Ni Ni Ni Ni Ni Ni Ni Ni has not described the scene of the war, but Zhang Zong could also feel the bloody smell.

The next morning, Zhang Zong went to Furong Garden as usual, preparing to continue discussing the enlightenment textbooks with Lu Chuan, but just as he was about to enter the room, he was suddenly stopped and said, "Sir Zhang stay!"
Chapter completed!