Even if Han Fei slaughtered Lu Bu, these people would never be so surprised, after all, Han Fei's record was there, and there was a precedent for defeating Lu Bu.

But arithmetic is not as good as martial arts, this relies on the kung fu of the water mill, but it is not made overnight, whether it is Liu Hui or Fu Zhu, which one is not a cold window of hard study for more than ten years, hard research, plus the actual experience, but in this way, Liu Hui still spent a full time with a stick of incense to calculate the same answer as Han Fei's half of the incense.

But how old is Han Feicai?

Sixteen years old!

Even if he learned arithmetic in his mother's womb, it was only sixteen years!

And it's simply not possible.

What's more, I have always heard that Han Fei is obsessed with martial arts, according to Han Fu's unintentional words, Han Fei has never seen or touched a book since he was six years old, such a person can write his own name is already very remarkable, but ......

The three of them were messy.

Where did he get his knowledge?

How did he know how to do arithmetic?

He......

Evil spirits!

The three of them looked at each other, and finally, they came to this conclusion.

Whether it is learning, arithmetic, or martial arts, at Han Fei's age, if he can achieve an achievement like his, he is already a great little genius, but if he combines all three, he is a demon!

Sure enough, he was quick to think and couldn't hide from him.

Seeing that Liu Hui thought of the key point in a moment, Han Fei couldn't help but nodded, being knowledgeable is one thing, but knowing how to be flexible is another, Liu Hui can think of the key to the problem so quickly. It also confirms what history says about him.

Resourceful, not under Tian Feng and frustrated!

Historical commentary, saying that Chen Gong is also widely famous. He is also resourceful, but he is still inferior to the top strategists, because he lacks the ability to improvise, that is, he is a little helpless against unexpected things. You can't give the right response right away.

Liu Hui's performance can't help but Han Fei's expectations are deeper.

However, Han Fei's main purpose here was to change the backward method of counting in this era, so he did not hide it. He smiled slightly and said, "Actually, the level of arithmetic may not be as good as that of the gentlemen, but I have chosen a more convenient method of counting, so that I can be better than the gentlemen." ”

A more convenient way to keep count. Heard Han Fei's words. Min Chun immediately thought of the symbol that Han Fei had just written, and at the same time looked at the number of chips in front of him. The so-called number chip, in fact, is a kind of counting tool in ancient China, and it has been used for a long time, from the Han Dynasty to the Ming and Qing dynasties, and it has a long history. However, the number chip is a high-end product, and others can only use the knot rope method to record the number.

Then. Even the frustrated professor couldn't stop his curiosity.

Han Fei was not stage frightened, and went outside to bring in a branch. Then, on a relatively soft ground in the hall, he used a tree branch as a pen to write out the ten Arabic numerals that were very popular in later generations, from 0 to 9, and then said to everyone: "Instead of using these symbols to replace Chinese characters for calculation, this is zero, this is a ...... There is a record in the account book of the Fang Cai that I have recorded, which is 157,431 stones, and by my method it can be recorded as 157431 stones, which is a single digit, which is ten digits, a hundred...... In this way, it is clear and clear, hehe, if the accounts of this book are recorded in my way, it should be at least eight or nine times out of ten thick. ”

The three of them nodded, thinking deeply, but they didn't show surprise, but their doubts increased, this is just a change of Chinese characters, in fact, the impact on arithmetic will not be too great. But Han Fei's next step made the three of them a little more surprised after seeing it.

The biggest difference between Arabic numerals and Chinese characters is that Arabic numerals only need to be written in one more column when carrying. This may seem like a small problem to people 1,800 years later, but in ancient China, it became a key factor in the complexity of ancient Chinese calculations.

You must know that in ancient China, Chinese characters were used to record numbers, and there were also upper and lower case differences, such as "一" is lowercase, and its uppercase is "壹". The latter is often used for records of more than ten or hundreds of digits, while the former is a single digit, of course, the case is also the distinction of later generations, and there is no such saying in ancient China.

And with Chinese characters, simple calculations such as single digits and ten digits are still clear and clear, but once there are hundreds or thousands, trouble will come out. In particular, it seems that these people such as Fu Zhu and Liu Hui are responsible for the calculation of grain and grass in the entire Jizhou, and the number of records used is definitely not just a thousand or hundred, but hundreds of thousands. Although there is the help of numbers, the larger the number, the more complicated the number will become. On the contrary, in Arabic numerals, the more is just one column, whether it is addition, subtraction or multiplication and division, as long as the single digit is aligned.

When Han Fei finished introducing Arabic numerals, he didn't talk nonsense, and directly demonstrated the addition, subtraction, multiplication and division calculations of more than six digits. Chinese are very smart, as early as the pre-Qin period, there were already ninety-nine multiplication tables, which also saved Han Fei more time, directly read the multiplication table, several people can understand.

Seeing that the calculation of more than six digits was so easy for Han Fei to calculate the answer through this pile of symbols that he had never seen before, the three of them were all dumbfounded and surprised. The three of them were surprised, but Fu Zhu and Liu Hui were the most excited, Han Fei's calculation method can be said to have rescued them from the extremely heavy calculation work, although they still have to calculate in the end, but I believe that with this simple calculation method, their efforts will be saved a lot.

There was also a rare smile of appreciation on his face, and Liu Hui even muttered: "Genius! Absolute genius! From now on, the complexity of arithmetic should be solved! ”

If you don't know the cost of firewood and rice, and you don't know the pain of calculation, Liu Hui and Fu Zhu are all gods who are hurt by these complicated numerical calculations, and now, how can you not be surprised when you see such a magical algorithm as Han Fei?

But after the surprise, there was more surprise, their algorithm has lasted for an unknown number of years, and no one can improve it, but Han Fei has just solved it, he is still a sixteen-year-old child!

And the three of them were surprised. Han Fei was secretly proud in his heart, and said in his heart: It turns out that the cramming education of all evils is not without benefits. I didn't read much, and I didn't have much education. But with middle and high school math, it's more than enough to cope with that.

The ancients won with poetry and scriptures, although they can also plagiarize some of the façade, but they are a little uncomfortable in their hearts, after all, it is not really their own thing, of course, others cannot know. Later generations will also put these works on his Han Fei's head, but after all, he knows it! Han Fei finally found that he could defeat them in one aspect. I was also proud in my heart.

The curious Liu Hui was surprised, but he also didn't think that Han Fei was a child, and asked in a low voice: "That's right, young general." The old man has something unclear. If it is calculated by division, what if there are integers in it that cannot be obtained? ”

Han Fei listened, but he was stunned for a moment, and said secretly: "Yes, the Chinese are really smart, and this era has noticed the existence of decimals."

The wisdom of the ancients should not be underestimated!

If Liu Hui asked other people this question, he really couldn't answer it. Even the compilation of "Nine Chapters of Arithmetic" can't answer, but for Han Fei. It's a no-brainer. Picked up a branch and wrote out a bunch of numbers at random, and did a division operation. For these smart people, it is tiring and time-consuming to talk about theories, and Han Fei does not have such good eloquence, so it is better to demonstrate directly, with their intelligence, even if they don't understand it at a glance, they should understand it quickly.

Sure enough, Han Fei's third calculation had not yet been completed, and the three of them had already noticed the importance of the existence of that decimal point, Min Chun smiled faintly and said, "This point has such a function, wonderful!" The major general's whimsy is so far, pure admiration! ”

Han Fei smiled humbly and said, "Mr. Bodian praised it falsely, in fact, this method is not difficult at all, it is just to change the counting symbols for your own convenience." As soon as these numbers come out, the rest of the matter will fall into place. ”

Han Fei told a small lie in order not to explain too much. And he is not afraid that this lie will be exposed, Arabic numerals were invented in the 3rd century, and no one knows at all in this era, Han Fei can be regarded as the first one.

Although this move was intentional by Cao Zhi, it was actually for the convenience of the future, after all, looking at the large number of numbers made of Chinese characters, as well as the mathematical problems composed of Chinese characters, Han Fei felt unusually big. The introduction of Arabic numerals not only made it more convenient for scholars to calculate, but also made it extremely easy for the people to learn even if they were exiled to the people in the future.

The most important thing is that he wants to dominate the world and compete in the Central Plains, and he has to come into contact with these like these, if he really sees accounts like this, he won't have a headache?

At this time, Liu Hui pointed to a large number of numbers on the ground, and laughed: "This symbol is unheard of, presumably it must have been created by the young general, we just happened to be at the meeting, and it should be named. ”

Fu Zhu and Min Chun stroked their palms together and laughed: "Wonderful! ”

Cao Zhi's face was slightly red, and he scratched his head and said, "This, I'm not afraid of it...... I'm afraid I don't dare to do it. ”

Fu Zhu smiled slightly and said, "Since it was created by the young general, why don't you dare to be it?" Immediately go to the lord to show the lord, and in the future, under the rule of the lord, this non-number should be used to calculate the record...... This is a reform, and the contribution of the major general is huge, and it will also leave a strong mark in the history of the youth, haha......"

"This ......" Han Fei saw that his mind had been decided, and he couldn't think of anything to refute it for a while, so he could only nod and said helplessly: "Okay, just follow Mr.'s wishes." ”

"Hehe, how do you think the young general still looks reluctant? Don't you know how many people are tired of this name, and it's not easy to become famous. Liu Hui was also in a very good mood at this moment, and he actually made fun of Han Fei.

"People are afraid of being famous, pigs are afraid of being strong, and the rafters that come out are rotten first, and sometimes they are too famous, which is not a good thing." Han Fei said lightly.

"Why is it that this young man of yours is more vicissitudes than us old fellows? Now that the major general is already famous all over the world, any more of this is just icing on the cake. Min Chun smiled.

Han Fei shook his head, and also realized that his name was a bit too much, and it attracted the attention of too many people, which was not very good for the future of Jizhou, but there was nothing to be done, after all, the name was out. "The three gentlemen are busy, so I won't bother the three of them here to do business."

"Since the young general is proficient in arithmetic, why don't you stay and help the old man. We have just learned this set of non-numbers, and I can't be proficient for a while. I'm afraid that there will be mistakes and omissions, and I can also let the major general point out when the time comes. "Frustration is the way of retention.

Han Fei hurriedly arched his hand and said, "How dare you say something?" Since Mr. Gong and Mr. have a life, they should spare no effort. ”

He is a man of action. Seeing that Han Fei agreed, and Fang Cai also spent a lot of time, he immediately transferred to work. In addition to doing this, it is necessary to cover the grain and grass well to prevent it from being soaked by rain, and to make a rough inventory of the grain and grass in addition to covering. Look at the surplus of grain and grass, it is enough for Jizhou to use for a few days. This kind of inventory can be said to be a daily must-do. Therefore, Fu Zhu, Liu Hui and others, who deal with logistics affairs, will be very busy every day, after all, the daily consumption of Nuoda Yiji Prefecture is not idle. But now there is this set of ultra-modern calculation methods offered by Han Fei. It has reduced the workload of Fu Zhu and others a lot.

Numbers are so easy to use. In fact, there was no need to wait for Han Fu's order, and it was soon popularized throughout Jizhou. Every time those account gentlemen saw Han Fei, their eyes lit up, and their admiration was self-evident. After the "non-number" named by the three of them was widely spread in Jizhou, there were many more names, but the most commonly used was the number of sons who did not know who gave them. This Yi Ji was not reluctant to speak, and soon replaced the non-number that they thought of, and this set of notation created by Han Fei. It is also known as "Childe Arithmetic", and Han Fei has also become a popular "Childe Fei". With the passage of time, it has become famous all over the country, and as Fu Zhu said, it has left a name in history.

……

"Senior brother, what are you going to do in such a hurry?" Cui Yan stopped Han Fei who was in a hurry, and he was very puzzled why he was in such a hurry.

Sui Yan followed Zheng Xuan to Jizhou, and was deeply valued by Han Fu, and now he also serves as an official in the state pastor's office.

"The teacher has a heat stroke, and the younger brother wants to find some ingredients to recuperate with the teacher." Han Fei stood down and said.

The weather in Jizhou is not as humid as Gaoden, dry summer, plus Zheng Xuan is also old, so he suffered from heat stroke, Zhang Ji even prescribed a few pairs of drugs to relieve heatstroke, but it did not have any effect, the old man was haggard day by day, Han Fei was anxious after seeing Zheng Xuan, thinking about some home remedies in later generations, and remembered the sour plum soup, so he was ready to make some to relieve the heat for the teacher.

"You want to cook?" Cui Yan frowned when he heard this, and said: "Senior brother, this matter is not appropriate, as the saying goes, a gentleman cooks far away, and if the junior brother really cooks in person, the state pastor and the teacher will be harshly punished." Brother knows that you are worried about the teacher's body, but you can leave it to the next person to do it, so why do it yourself? ”

"But the little brother also asked, no one will make this sour plum soup." Han Fei frowned.

Han Fei is very unimpressed by this gentleman's statement that he is far away from cooking, after all, it is still from the soul of 1,800 years later, although he has lived here for 16 years, but some habits can not be changed by saying that he can change them.

"This ...... Senior brother, although the subordinates will not know, they only need to be guided by you, junior brother. Senior brother, you are now famous, representing Jizhou, how many people's eyes are staring at you, and I hope that my junior brother will pay attention to his identity. Cui Yan rolled his eyes and came up with this compromise.

Hearing that Cui Yan didn't let him go, Han Fei could only nod helplessly in agreement, found a chef with good skills, and explained in detail the method of making sour plum soup to guide the cook to cook.

Chinese cuisine has a long history, and the dishes are rich and varied, as long as they can be eaten, they will be used as ingredients and made into a variety of dishes. However, in the Han Dynasty, the dishes were far less rich and perfect than those of later generations, and the best dishes to eat were limited to the family, and the most common practice for ordinary people was to boil them in water and eat them, and there were not too many patterns.

Today, Han Fei pointed out the sour plum soup made by the cook, which really opened the eyes of the people present. This kind of fruit is not uncommon in the Central Plains, and ordinary people often pick some to eat, so it is not difficult to find it. In addition to that, other ingredients like sugar are available in the kitchen. However, sugar was extremely precious in this era, and most of the sugar was supplied to the upper class in Jizhou for consumption, and the stock was very small.

Now that Han Fei wants to use it, and it is still made for Zheng Xuan, the kitchen is naturally willing to take it out. And to make sour plum soup, you also need hawthorn, osmanthus, licorice and other ingredients, these things in the late Han Dynasty are mainly materials, Jizhou is also rich, there are many reserves, soon all found.

Sour plum soup is the traditional summer food of Beiping in later generations, Han Fei had stayed in Beiping for a period of time before his soul crossed, and he also had a lot of experience in making sour plum soup.

Fortunately, the black plums picked by the cooks have been left for a few days, and these days are extremely hot, and the black plums have a tendency to dry in the kitchen, so Han Fei directly took them and used them, instructed the cooks, put the black plums, hawthorn, licorice, etc. into the boiling water and boiled for about half an hour, then added sugar and mixed thoroughly.

Since the freshly cooked sour plum soup is hot, and the weather is hot, there is little ice in this era, and it is difficult to make the sour plum soup cold. Han Fei taught people to pour the sour plum soup into the bamboo tube, and then sealed the mouth and threw it directly into the well water. Because the well water is underground, the temperature is cooler than ordinary water, and although the effect is not as good as ice after putting it in, there is no way to do it.

After more than an hour, Han Fei rushed to Zheng Xuan's house with a bamboo tube of sour plum soup and Cui Yan with joy. As for the extra ones, Han Fei asked people to pretend to be sent to Han Fu, after all, it was his father, and he was old, so the hot weather was probably very difficult, although there was no heat stroke, but it was good to prevent it. (To be continued......)