Chapter 31 "Arithmetic".

PS: Everyone, the collection and recommendation are a little bleak, I hope you have strong support, today's first update, the second more may be later.

"It's a huge project, and it's going to take decades." Dr. Zhao thought for a moment and spoke.

"It's not just decades of work, but there is no end to mathematics if life is endless." You haven't seen what mathematics looks like when later generations have studied things for hundreds of years and made those college entrance examination champions who can be called human beings unable to enter.

"Yes, just one "Nine Chapters of Arithmetic" is enough for many people to study for a lifetime." Dr. Zhao didn't know whether he was good or bad, right or wrong.

"However, most of the problems can be solved if you use equations." The eldest grandson has this self-confidence.

"Oh, that's true."

"A landlord has seventeen sheep, and before he died, he made a will, saying that half of it would be given to the eldest child, one-third to the second, and one-ninth to the younger son. What do you think of the division? Changsun Tang did not answer directly, but threw out this Western math problem. Then he slowly sipped the tea and watched Dr. Zhao and Li Chunfeng scratch their ears and cheeks.

"You have a problem with this question, it's impossible." Li Chunfeng checked it several times and finally confirmed that there was a problem with this topic.

"It's simple." Looking at Dr. Zhao's somewhat reddened eyes, Changsun Tang decided not to be too aggressive.

"Well, that's right, I'll produce one more sheep, so that there will be eighteen sheep......," said the eldest grandson, who said the ladder process of the so-called "classic" brain teaser of this rotten street in later generations.

"What's your subject?" Daoist Xiao Li was a little angry, you didn't say that you still have a sheep, although in the end you took it away.

Dr. Zhao still didn't say a word, but he looked at Changsun Tang's gaze a little unkindly.

Of course, this topic is not the purpose of Changsun Tang.

"I won't say much about the process of solving this problem, you two also think there is a problem, but it's not easy to say what the problem is, right?" If you want others to contribute, you can't do without two brushes, and then the eldest grandson is trying to see the dagger.

"Speak quickly!" It seems that Dr. Zhao is not going to put up with it.

"Well, if we don't know how many sheep there are, and we set the number of sheep to be a value, then if we add them up, we will find that these are less than this value, that is, the sheep cannot be divided." Changsun Yu continued.

"If we generalize this approach, it's called an equation." The eldest grandson didn't wait for the two to ask.

"It's easy to say this, and it's not difficult." Li Chunfeng definitely belongs to the level of a top student.

"No, it's very easy to understand by yourself, but if you want others to understand, you need a standard, otherwise one routine for one person, this can't be promoted." After all, Dr. Zhao is a professional, and he may not have the time to study a certain issue, but in terms of the professionalism of education, this is definitely an authority.

"That's what we need to discuss today." The eldest grandson turned out to be stubborn.

"If there's anything you say." Li Chunfeng said.

"That's right, the renaming of arithmetic can be postponed for a while, but I plan to establish the three branches first, and use the number system to improve it." The eldest grandson finally said all the purpose, without which it would be impossible for them to realize the great benefits contained in it.

"You mean we're all three of us?" Li Chunfeng asked, religious people are definitely the originators of psychology.

"Yes, I tentatively intend that I will be in charge of the figure part, the Taoist master will be in charge of the equation part, and the gentleman will be in charge of the most basic and important arithmetic part." Changsun Tang knew that it was a little difficult for him to ask Dr. Zhao to be in charge of arithmetic, and he still needed to stipulate this basic framework, but fortunately, he could say these things together today, so that Li Chunfeng could also master it.

So, such a voice came from the living room of the eldest grandson's house.

"Read with me, one by one gets one, one two gets two, one three gets three......"

"One by one, one by one, one ......" out of some bad taste, the eldest grandson asked the two to follow along with the ninety-nine multiplication formula.

It doesn't matter if you are stupid, if someone is more stupid, if you set yourself off, your stupidity will not be outstanding, this is a powerful weapon for Changsun Tang to deal with embarrassment.

"Oh, by the way, it's more troublesome for you to remember, so why don't I copy a copy." The eldest grandson looked at the eyes of the two of them who were ready to kill, and his stiff scalp trembled, and he wrote down the crooked ninety-nine multiplication formula table with a brush.

I was going to catch a strong man and write it, but I didn't look up and knew that the eyes of the two could kill me, so I had to write it myself, and there is a saying that describes it like this: If you don't die, you won't die.

After writing it head-on, he presented it to the two, and while the two of them looked at it, the eldest grandson explained at the same time.

The credit for compiling a book is too great, especially this kind of work that can be regarded as a pioneering school.

Standing higher can see farther, but you also need to face a more harsh cold wind, if there are several people climbing together, you can huddle together to keep warm.

Especially for a master like Li Chunfeng, who is free from the world and the court, as a big head, he is the most suitable candidate, which is also what Changsun Tang realized after several conversations with the big guy: your head is not big enough, so find a big head to top, and you can follow behind.

After talking about the division of labor between the three people, Changsun Tang said the most basic rules of arithmetic, including algorithms, positive and negative numbers, and fractions, but they are only the most basic, and the rest is left to Dr. Zhao and Li Chunfeng to improve, any discipline has its own laws, what we need is discovery, not regulation.

Unconsciously, the day's time was exhausted, and after the eldest grandson and the two had a meal, the two said goodbye and went home.

The eldest grandson knew that this was just the beginning, and that he would encounter more problems in the future.

As soon as the two of them left, Fauber came in.

"Young master, here's an invitation from you." The eldest grandson said many times that there was no need for Fu Bo to be so polite as an elder, but he was all pushed back by a sentence of difference between master and servant.

"Oh, there are a lot of invitations these days, when did I become so sought-after?" The eldest grandson laughed at himself.

"The young master has this sought-after capital." Fauber made a rare joke and handed over the invitation.

"Oh, hehe. It seems that this son has been a lot more handsome recently. Judging from the self-proclaimed name of the eldest grandson, there is a new generation of young people who grew up under the red flag and has been corrupted by all evil feudalism.

This good mood didn't last long, because it was sent by the Prince's Mansion.

The eldest grandson was disgusted as if he had eaten a fly, but he knew that it was a Hongmen banquet, but he had to go, just because the invitation was delivered in the name of the prince.