Du Zhi and Zhao Feng first saluted Bai Yue's family, Bai Yue's family was generous, knowing that these two officials were coming for their son, they said a few words, and left with their families, and specially explained that Bai Chi sent a few tables and chairs, and then made a pot of good tea; Looking at the line, it can be seen at a glance that these two people are looking for their son is in a hurry, otherwise they will not come with two black circles, there is a pond of living water in front of the white house, and the willow tree that has just been moved is good to raise, just smoked the flocculent, will not fly all over the sky, drinking tea and chatting under the willow tree, it is also a pleasure, not rude.

Look at the Bai clan people, the Pixiu who is called humming turned around three times in one step, and seemed to be still observing himself, Du Zhi and Zhao Feng glanced at each other, and when they saw each other's dark circles, they couldn't help but smile bitterly. Or Bai Dong took the initiative to greet the two: "Zuo Sikong, Zhao Sima, please sit down, both of them are arithmetic masters, and now they are coming together, but there is something to teach the boy?" ”

"Don't make fun of the five doctors, just look at the dark circles under my eyes and Brother Zhao, Mr. Guigu's topic is difficult to kill, hey, pity me and Brother Zhao for a night, and they also have their own answers, they argue fiercely with each other, and almost ruin the righteousness of their friends, but they find that our answers are not right, Mr. Guigu is really clever, admire and admire."

Bai Dong laughed when he heard it, Du Zhi is Du Zhi, and he still refuses to bow to himself, and he never leaves Mr. Guigu, which means that he loses to a cheap master, not to himself, a hairy boy; didn't demolish him, just looked at Zhao Feng with a smile to see what he said.

"It's just to teach, but it's just to ask the five doctors to teach the two of us. This arithmetic problem is extremely exquisite, Zhao thought that what he had learned in his life was enough to be called a contemporary arithmetic master, but he didn't expect to be stumped by such a question, tossing and turning all night, and I felt that I couldn't solve this problem with what I had learned in my life, could it be that this problem was really from Mr. Guiguzi? There is such a great man in the world. I just hate not to see each other, what a pity! It's a pity. ”

"It doesn't matter who came up with the question, the point is that I know the answer." Bai Dong smiled slightly, and took out the answer that had been prepared a long time ago from his sleeve: "I knew that Zuo Sikong would come to me, but I didn't expect that my old Qin No. 1 arithmetic master would also arrive, the answer is ready, do you want to see it?" ”

"Answer! That's great! Du Zhi's eyes suddenly lit up, and he stretched out his hand to pick up the bamboo slip, but was grabbed by Zhao Feng: "Zuo Sikong is wrong, what can you do if you know the answer out of thin air." Is this the way you and I are pursuing? Five doctors, today I am not here to find the answer, but to find the means and method to solve the problem, if Zhao did not guess wrong, to solve this problem. A new kind of 'arithmetic' is needed, I wonder if I guessed it? ”

"Haha. Zhao Sikong is worthy of being a famous master of collecting and compiling 'nine numbers'. You guessed right, it is not impossible to solve this problem with the method of calculation, it will take years and months to do it, and the grass used is afraid to be placed on the beam, how can this be done by manpower? So we're going to use the concept of 'fractions.'"

It is better to teach a man to fish than to teach him to fish, and he who is good at teaching him to fish. Good scholars, seeking fishing. The scores that the sixth grade of primary school is exposed to, in this era, can really be called a new type of 'arithmetic theory', whether Guiguzi has studied this step Bai Dong dare not say. At least it is impossible for a 'mathematician' of Zhao Feng's level to understand fractions, otherwise he would not have rushed to ask for advice.

"Ask the five doctors for advice." Du Zhi and Zhao Feng glanced at each other, the two of them were very excited, at this moment, Du Sikong still looked like a scheming villain, just a diligent and good student.

"The basis of this score is one, whether it is divided into ten, hundred, or even ten million parts, it is included in one, and it cannot exceed one, can two people understand?"

"One contains all things, and the One is One! Nature is understood. ”

"Okay, but that's just the most vague theory, and you can't solve it with it. We have to set a special symbol for the score, such as "Bai Dong walked to the lake, broke off a willow branch, and drew a strange symbol on the ground, 1/3."

"The words we use are very complicated, especially the numbers from one to nine, which can be used to write down on the bamboo, but if it is used to calculate, it will be more troublesome, so we must use simpler words, please see the two."

At the end of the 1/3 fraction, Bai Dong wrote out the ten numbers from 0 to 9, and said with a smile: "With these nine basic numbers, it can be very convenient to calculate in the future, because they can add and subtract from each other, multiply and even divide each other, and can also form the basic unit of operation fraction." Both of them are masters of arithmetic, so I don't think I need to say more. ”

"Wonderful, really wonderful! As long as you memorize these ten numbers, there are endless possibilities. The five doctors have made great contributions, what is the name of this number, and who created it? ”

"Who else can there be but my teacher and a pedantical man?" Bai Dong smiled slightly, Mr. Baghdad, I'm sorry, if you want to blame you, you are not from Huaxia, let alone my cheap master. However, in a few years, you might as well come to China to be a scholar, just like the students from the island countries who came to China to study in the Tang Dynasty

"Sure enough, it's Mr. Guiya! Five doctors, if these 1 and 2 are added, it should be 3, and how should it be expressed in between? ”

"Just add this symbol." Bai Dong smiled and drew a '+' and '=' signs, Du Zhi and Zhao Feng looked at this symbol, and suddenly stroked their palms and laughed: "Understood, five doctors, please continue, continue"

Both of them are experts, when it comes to the depth of arithmetic literacy, after all, the primary school students of later generations are still incomparable, he just lacks scientific calculation methods, once he opens the door, he understands all kinds of basic arithmetic symbols, addition, subtraction, multiplication and division, etc., and suddenly he is cheerful, and he happily lies on the ground and calculates for a long time, feeling that life is interesting, nothing more than this, and suddenly thought that the purpose of his coming is still that problem, so he reluctantly put down the wicker and turned to Bai Dong for advice.

"Fractions come from integers, and the so-called 1/3 means that three points occupy one point, so what about 1/1?"

"Why do the five doctors bother to test me, 1/1 is naturally still 1, among the scores, the largest is one, and there is no greater number."

Zhao Feng reacted very quickly, and in the future life, he would definitely be a good student who could definitely be a representative of mathematics classes.

"Well, but this is only for the 'real' score, in fact, there are exceptions in the score, for example, in some cases, we can write such a number" Bai Dong wrote another 20/4, and then looked at the two of them with a smile, but did not speak.

"What is this?" I haven't learned the calculation method of the numerator yet, but with the arithmetic foundation of the two of them, I can still feel that this number should be greater than one.

"This is to present an integer in the form of a fraction, and the two of them don't need to study it in detail now, as long as they know that 20 is the numerator, 4 is the denominator, and the numerator is divided by the denominator to get 5, in fact, this is beyond the range of 1, and it belongs to a false fraction and a true integer. However, you should know that integers also have this form of table xiàn. Okay, let's take a look at how fractions are added and subtracted from each other, the denominator is the same, then the numerators are superimposed, for example, 1/3 and 1/3 are added to get 2/3, so what if 1/3 and 1/5 are added"

Now Bai Dong understands why Li Di is so happy, it turns out that teaching genius students is such a cool thing, Du Zhi and Zhao Feng have no obstacle in learning scores, every time they ask questions, they are at key points, but in just over an hour, they have completely mastered the basic calculation method of fractions. Zhao Feng pondered for a while, and suddenly bowed deeply to Bai Dong: "Mr. Xie taught me." ”

"Sir, please also accept Du Zhi's worship!" I have never seen Du Zhi respect someone so much, not even his teacher Gan Long.

"The two of you don't have to be like this, I am equal to the palace as a minister, and it is because of the communication between the two of them that Mr. will not dare to be."

"Deserved! Zi said, "Zhao Feng can be taught by Mr. Zhao Feng and has no regrets in this life." Sir, Zhao Feng said goodbye first, and wanted to go back to study the problem carefully, which was rude. ”

I didn't see such a hurry when the house was on fire, Zhao Feng bowed deeply, turned around and left, so busy that he couldn't even care about the demeanor of the doctor, and he was even more angry than the young official of the son.

Du Zhi learned from Zhao Feng and turned around to leave, but was grabbed by Bai Dong: "Don't think about it, even if you and Zhao Feng both learn the fractional algorithm, you can't beat him." The name of the first god of Great Qin, except that I am Zhao Feng, you are also delusional if you think too much. ”

"How so?"

Du Zhi's face froze. He has many hobbies in this life, the first loves money, the third loves fine wine, the fourth loves beautiful women, and the second love is not the domineering theory of the king, let alone the ethereal Taoist remarks, but the study of counting; Zhao Feng is his friend, but he is also his biggest competitor, so he wants to solve this problem first and press Zhao Feng, can he be caught by Bai Dong?

"Hehe, because what you love most in this life is not the way of counting, but money! If a person has a greedy heart, even if he is a genius, he will not be able to reach the top in his studies. Believe me, you and Zhao Feng are not the same kind of people, he can not eat or drink in order to study mathematics, can you do it? ”

Bai Dong smiled slightly: "Now I have a way to make a lot of money, not only can you and I make a lot of money and become the richest in the country, but also let the world praise you and my merits from now on. However, if Zuo Sikong is willing to abandon money for the way of counting, Bai is very impressed, so he will let you go back. ”

"Hahaha, my brother Bai, you and my brother have a deep friendship, why are you making fun of your brother? The way of counting is profound and charming, with countless changes, and my brother likes it deeply. But no matter how good the knowledge is, you have to eat a full stomach to study, brother is not as stupid as Zhao Feng, he knows that making money is the most important thing in life, let's talk about it, what is the way to make money and pass on to future generations? ”

Du Zhi's heart was itching, as if there were a hundred insects crawling. (To be continued......)