"Okay, now I've written some decimal numbers and fractions on the blackboard, and you can convert them into percentages!" Zhao Yan pointed to the two lines of numbers on the blackboard and instructed Xue Li and the others below, and then deliberately glanced at Zhao Yan, but now he was sitting there dumbfounded, looking at the blackboard with a blank look, it is estimated that he has not understood a word since the class. ⌒

After Zhao Hao entered the primary school just now, the suspicion and contempt on his face had long been seen by Zhao Yan, which made him very unhappy, so he didn't remind Zhao Hao before class, and directly asked him to follow Xue Li and others to listen to the class, now it seems that the effect is good, it is estimated that Zhao Hao has deep doubts about his own IQ.

"How is the fourth brother, is there anything you don't understand?" Zhao Yan walked over with a smile and asked deliberately.

"Giggle~" As soon as Zhao Yan's words fell, Ya'er next to her laughed, she had already mastered the mathematical knowledge of primary school, so she was very idle in class every day, and she had already appeared Zhao Yan's embarrassment, and now hearing Zhao Yan deliberately ask this, it was obviously embarrassing for Zhao Yan.

Zhao Yan was very smart, and at this time he also guessed Zhao Yan's intentions, and looked at Ya'er who was covering his mouth and laughing very depressed, and then he looked up and said to Zhao Yan: "Third brother, you should ask me if there is anything I understand, not something I don't understand, but I can honestly tell you, I almost didn't understand a word, are you sure that what you are talking about is arithmetic?" ”

"Haha, you don't understand, of course, what I'm talking about is arithmetic, but unlike traditional arithmetic, this new type of arithmetic symbolizes numbers and operations, so if you want to learn this kind of arithmetic, you must understand the meaning of each symbol. Otherwise, you won't understand it even if you listen to it for a hundred years. Zhao Yan laughed and said, this is what he wants.

"What's the benefit of symbolizing numbers and operations?" Zhao Hao asked again puzzled.

"There are so many benefits, but you won't be able to experience it just by saying it with my mouth, so let's make a simple question. Let you and Ya'er do it, and then you can symbolize the benefits of arithmetic! Zhao Yan said with a smile.

As soon as she heard that she was going to do the question, Ya'er immediately excitedly agreed, and then turned to Zhao Hao and said, "Little Junwang, my math is very good, don't cry if you lose!" ”

Although Zhao Gang is only one year older than Ya'er, he is far more mature than his peers, and now he can't help but feel a little crying and laughing when he hears Ya'er's words, but he can't show weakness. In the end, he could only say helplessly: "Don't worry, although I am not very proficient in arithmetic, I will not lose to a little girl!" ”

Seeing that Zhao Yan didn't know how powerful Ya'er was, Zhao Yan couldn't help but smile, and didn't explain at the moment, he directly wrote a very common application problem on the blackboard, and also let the math madmen Xiao Ming and Xiao Hong also officially appear, and the question was very simple. That is, Xiao Ming and Xiao Hong are a hundred miles apart, and Xiao Ming can walk twenty-five miles in an hour. Xiaohong can walk fifteen miles in an hour, if they walk in the same direction at the same time, how long will it take for them to meet, and how many miles will each of them walk?

The above application problem is a simple one-dimensional equation, and it is easy to solve this problem at the level of arithmetic in the Song Dynasty, and Zhao Hao has been exposed to this problem when he was studying in the palace before. Therefore, when he saw Zhao Yan's question, he immediately showed a smug expression on his face, and immediately took the small blackboard in front of him and checked it.

However, just when Zhao Hao just didn't write a few words on the blackboard, he heard Ya'er next to him giggle again: "Don't forget it, the two met after 2.5 hours after they came out." Among them, Xiao Ming walked 62.5 miles, and Xiao Hong walked 37.5 miles! ”

"No way, how did you calculate so fast?" Zhao Hao heard that Ya'er said the answer without even counting, and immediately said a little angrily, because he felt that Ya'er was messing around, either she already knew the answer, or she guessed randomly?

"Ya'er, don't mess around, let the fourth brother finish the question!" Zhao Yan reprimanded with a straight face, he didn't doubt Ya'er's answer, for this rare mathematical genius, the one-dimensional equation was as simple as one plus one.

Hearing Zhao Yan's words, Ya'er stuck out her tongue mischievously, didn't dare to disturb Zhao Yan anymore, sat on the side and watched him honestly calculate the problem, but it took a lot of tea for Zhao Hao to calculate the answer clearly, but at this time, he was shocked to see that the three answers were exactly the same as what Ya'er just said.

"Third brother, Ya'er, she wouldn't have known the answer a long time ago, right?" Zhao Hao asked in disbelief at this time.

"Little county king, don't bully people, I calculated it myself!" Seeing that Zhao Hao actually doubted herself, Ya'er immediately shouted unconvinced, her little face was also flushed, since she came to school, it was the first time that anyone dared to doubt her ability.

"Haha~, since you don't believe it, fourth brother, let Ya'er write out her calculation process." After Zhao Yan finished speaking, she gestured to Ya'er, but the little girl picked up the chalk angrily, substituted an unknown number in the question, and calculated the result in only two steps.

It's just that the answer written by Ya'er is Arabic numerals, and the decimal point is used, so Zhao Yan can't understand it, so Zhao Yan helped him explain it, and wrote out ten Arabic numerals, and Zhao Hao quickly understood it with Zhao Hao's cleverness. It's just that he still has some doubts about Ya'er's calculation process.

Seeing this, Zhao Yan didn't explain, and directly came up with a more difficult binary equation, and asked Zhao Hao to change a few numbers in the question, and then let the two of them calculate together, but this time Zhao Hao still didn't write a few words, but Ya'er had already calculated the answer, and when he spent a lot of effort to figure out the answer, now Ya'er did not make a mistake, and now he was finally shocked, and looked at Ya'er and Zhao Yan with some stunned for a while.

"Fourth brother, you understand now, the calculation process of traditional arithmetic is very complicated, sometimes a simple problem has to be calculated for half a day, and the process of calculus alone has to write several pieces of paper, which can be said to be a waste of time and paper, but after using this kind of symbolic mathematics I taught, not only is the calculation faster and simpler, but also the thinking is clearer, and it is easier to learn!" Zhao Yan said with a smile at this time.

"I understand the third brother, don't worry, I will study hard!" Zhao Gang also showed a firm expression at this time and said, originally he was a little skeptical about what Zhao Yan taught him, but now that he saw the magic of this symbolic mathematics with his own eyes, Zhao Gang couldn't help but be curious about the next courses, such as chemistry, biology and the like to be studied in the future, what kind of courses are they?

Zhao Yan nodded with satisfaction when he saw this, and immediately took out a few pieces of paper that had been prepared a long time ago and handed them to Zhao Hao, the paper was full of numbers and symbols, as well as the meaning they represented, Zhao Yan needed to memorize them all now, and then practice slowly in the future, and sooner or later he could use them flexibly.

In the next few days, Zhao Cheng followed Zhao Yan to the school every day to study, and with the deepening of his study of mathematics, Zhao Cheng Yue felt his previous ignorance, he never thought that mathematics was so broad and profound, if he was not only interested in medical skills, I am afraid that he would turn to study mathematics.

In addition, Zhao Yan did not forget the matter at the military academy, because Zhao Yan and Zhao Zongye privately fought and led the fire of the dormitory students of the military academy, which was also the first accident since the establishment of the military academy, so Zhao Yan and Zhang Zai and others discussed and decided to deal with it severely, among which Zhao Yan was mainly responsible for this accident, after all, it was he who made the first move, and he also beat the fire chief, so in the end Zhao Yan decided to expel Zhao Yan from school and never hire.

After Zhao Hao officially received the notice of expulsion from the military academy, he immediately jumped up happily, he was still a little reluctant when he just left the military academy, but since he came to Qingshui Primary School, he now has a more suitable place for himself, so he has long wanted to leave the military academy quickly, so this expulsion notice is exactly what he wants. In addition, Zhao Yan also used this incident to sound a wake-up call to the cadets of the military academy, and even his own younger brother dared to expel him, let alone others.

As for Zhao Zongye, he was also severely punished, after all, as the fire chief, he did not bring his subordinates well, and insulted his subordinates with words, which naturally violated the rules and regulations of the military academy, so in the end, Zhao Zongye was removed from the position of fire chief, and he also had to copy the school rules three hundred times, and recorded a major demerit. Zhao Zongye did not have any objection to such a result, and even said that as long as he was not allowed to leave the military academy, he would accept any kind of punishment.

With the passage of time, the spring of the third year of Zhiping passed quickly, and the weather became hotter day by day, Zhao Yan's Qingshui Primary School was also slowly on the right track, the children there in the first grade had mastered a lot of reading and writing, Zhao Yan also began to teach them some mathematics courses, as for Zhao Yan and Xue Li their second grade, in addition to mathematics, Zhao Yan also began to talk about some biology, physics and other knowledge, these knowledge and mathematics complement each other, and it is not too difficult to understand.

On this day, Zhao Yan got up early as usual, and went to Xue Ning'er to look at Xiao Siyue first, now the little guy can already raise his neck, and at the same time he is whiter and fatter, looking like a small meat mound, and the flesh on his face even squeezes his eyes smaller, looking like a doll on a New Year's painting.

Then Zhao Yan went to Yelusi again, and personally helped her to eat in the restaurant, now she is six or seven months pregnant, she looks very bulky, and she has to be supported when she walks, and Princess Bao'an firmly believes that Yelusi's belly must be a boy, which makes Cao Ying have a sense of crisis, and she tosses Zhao Yan desperately at night, but in the end, she is often tired to death, on the other hand, Zhao Yan is a hundred times more energetic.

After having breakfast with his wives and concubines, Zhao Yan called Ya'er and Zhao Hao to go to the elementary school together as usual, but what he didn't expect was that the school welcomed a guest today. (To be continued!)

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