"You must have just heard my answer, or maybe you've seen this question before!" Li Xuan was stunned for a moment, and immediately said with great certainty. Pen "Fun" Pavilion www.biquge.info

If Li Yi gave the answer after this stick of incense or even within a stick of incense, although he would also feel surprised, it was also within his ability to bear.

After all, in his eyes, even if Li Yi is not the smartest person in Jingguo, he is not far behind.

And as soon as he finished talking about the question, Li Yi was able to say the correct answer in one bite, this is not a human, it is a demon.

This time, Li Xuan really guessed wrong, just now he suddenly jumped up like a hysteria, which scared Li Yi, how could he have the heart to listen to what this thing said.

Although I have seen similar questions before, the answer is not the same if I change the number, and there is no second possibility he said.

The problem of chickens and rabbits in the same cage, in the future generations, I am afraid that as long as the primary school students who have learned the Olympiad mathematics, they can report the answer in one bite, and there is no need to cheat at all.

Isn't it humiliating to test yourself with such a difficult question in elementary school?

"Hehe, if you want to repay the debt, just say it, why bother with such an excuse." Li Yi pursed his lips, looked at him, and said with disdain.

Li Xuan's handsome face flushed, dignified son, it was really not nice to talk about the debt, but he was more eager to know what method Li Yi used to get that answer.

"As long as you tell me how you solved this problem, I will lose another hundred taels to you in addition to the one hundred taels that I said were good." Money is just a number for Li Xuan, and he is more interested in those novel methods that Li Yi throws every time.

Even Li Mingzhu's eyes were on Li Yi, she didn't know why she was so far about this question, she tried it one by one, and after spending a little time, she could naturally try out the answer, but he could calculate it so quickly, if he didn't know the answer in advance, he used a method that they hadn't seen before.

Money is just a number to Li Xuan, but not to Li Yi, it is a brick, a tile, and a room in a big mansion......

"You just said that ------ there are thirty-five heads on the top and ninety-four feet on the bottom?" His opening showed acquiescence to Li Xuan's move to send money just now.

Li Xuan nodded again and again.

"Let's assume, just assume......" Li Yi stretched out his hand and gestured, "Let's say these chickens and rabbits are well trained." ”

Li Xuan looked confused, he solved the problem, what does it have to do with whether these chickens and rabbits are well-trained?

However, given that Li Yi has always taken an unusual path, he still feels that he will listen to it first.

Li Mingzhu frowned when he heard this, and quickly let go, obviously having the same idea as Li Xuan.

"If these chickens and rabbits are very obedient, they will lift one foot and ...... if they clap their hands."

"How can there be such a solution?" Li Xuan couldn't listen to it anymore, where are there such obedient chickens and rabbits, if such a bizarre method can also make sense, then just let those chickens and rabbits spit out their mouths and say the number of the same kind by themselves.

Li Yi glared at him, "Do you want to know the method?" ”

"If you continue to talk nonsense like this, there will be no money." Although Li Xuan was stupid, he was not stupid to that extent.

"Go on." Li Mingzhu seemed to understand something, his eyes were full of surprise, and he urged.

Li Yi glanced at Li Xuan with complicated eyes, and Li Xuan understood what he meant.

He was laughing at himself for not even being as good as Mingzhu.

However, Mingzhu has been smart since he was a child, and when he was taught by his husband in the palace when he was young, Li Xuan discovered this matter.

Although this is an indisputable fact, in my heart, why is it so unpleasant?

"Clap once, raise a total of thirty-five legs, clap twice, lift a total of seventy legs, at this time, all the chicks sit in the cage, no legs to count, each rabbit has two legs left, and the remaining legs in the cage are twenty and four, then the number of rabbits is twelve, and the number of chickens is twenty-three."

As Li Yi slowly spoke, Li Mingzhu's eyes were full of wonder, while Li Xuan was dumbfounded.

At this moment, I am afraid that only the galloping of thousands of horses can describe the true feeling in his heart.

What the can it be?

The problem that had plagued him for a whole day could be solved with just two clappings?

Didn't the old man say that yesterday?

It doesn't matter if you can't solve it, because the Master himself only knows the answer, not the specific solution.

He glanced back at Li Yi------ it was really a demon!

Li Xuan's expression Li Yi saw it all in his eyes, and he was not much surprised by this.

There are no Arabic numerals, no binary equations, mathematics together, at best, it can only be called arithmetic, and it is still in the stage of ignorance, and it may be hundreds of years before a master of mathematics against the sky emerges, who is still an astronomer or a Taoist priest......

After all, these are not tested in the imperial examination, and the degree of attention to arithmetic is not high, and it is not uncommon for a chicken and rabbit to be in the same cage, and it is not uncommon for Guozi to be a doctor of supervision.

The method he used just now, called the "leg lifting method", is not a joke that makes people laugh on the Internet in later generations, and this is indeed the solution to this problem in the ancient arithmetic classic "Sun Tzu's Sutra".

From Li Xuan and Li Mingzhu's reactions, it can be inferred that "Sun Tzu's Sutra" either does not exist in this world, or it is too old, and this method of solving the problem has been lost.

"It's unbelievable that there is such a way to solve the problem." Li Xuan couldn't help but admire.

He was not really interested in arithmetic, he just wanted to solve this problem and impress the master who taught him, and after thinking about it for a whole day, he tried out the correct answer in his mind, and then used Li Yi's alternative method, which only took two breaths.

"It's unbelievable, it's okay, we can try another way." Li Yi is still very kind, at least to make Li Xuan feel that the two hundred taels of silver are worth losing.

"Is there any other way?" Li Xuan exclaimed and leaned over his head.

"First of all, you need to remember a new way to count......"

Li Mingzhu and Li Xuan watched Li Yi write and draw on rice paper with a pen, those strange simple figures, which they had never seen before, combined together, turned out to be a new counting method.

Both of them have received aristocratic education, and they have a profound background, although this thing seems novel, but it is not difficult to understand, after Li Yi's simple explanation, it took a little time to digest this set of rules.

I was amazed in my heart, this set of methods is undoubtedly much better than Jingguo's current counting method, more convenient and simple......

"This is called the equal sign, this is the plus sign, the minus sign, this fork, can be understood as a number that I don't know for the time being......" Li Yi didn't think about it so much at first, and when he really started to explain, he found that it was not much easier to popularize these knowledge for them than to teach two children who had just entered elementary school.

But the words have already been spoken, so naturally we can't give up halfway, so we have to be patient and move forward little by little.

Half an hour later.

"In this way, the two unknowns are solved, which is the number of chickens and rabbits." Li Yi breathed a long sigh of relief, and finally popularized it for them from beginning to end, feeling a little exhausted.

It's still simple to teach bear children, you can fool the past by making up some stories, if Li Xuan asks this kind of question again in the future, he will definitely not do it without adding money!

"Got it?" He looked at the two of them and asked expectantly.

Although the process is a little tortuous, if they understand, it can be regarded as a little comfort in their hearts.

"Nope." Li Xuan said categorically without the slightest hesitation.

Li Mingzhu also looked puzzled.

"Two rotten trees," Li Yi sighed in his heart.

"Xiaohuan, send off!"

Looking at the little maid who walked to the door, Li Yi spoke decisively.

"Uncle, it's time to eat......" The little maid stood at the door and said weakly.

"Don't be in a hurry, eat first, and when you're done eating, you should understand it if you tell me a few more times." Li Xuan patted him on the shoulder, stood up, looked at the little maid with a smile on his face, and asked, "Miss Xiaohuan, where are you eating?" ”