"You must have heard the answer I said just now, or you have seen this question before!" Li Xuan was stunned for a moment, and immediately said with great certainty.
If Li Yi gave the answer after a stick of incense or even within a stick of incense, although he would be surprised, it was within his tolerance.
After all, in his eyes, even if Li Yi is not the most intelligent person in Jingguo, he is not far behind.
And just after he finished speaking the question, Li Yi was able to give the correct answer in one go. This is not a human, but a demon.
This time, Li Xuan really guessed wrong. Just now he suddenly jumped up hysterically, which startled Li Yi. He didn't have the heart to listen to what this guy said.
Although I have seen similar questions before, but changing the number, the answer is different, and there is no second possibility he mentioned.
The problem of chickens and rabbits in the same cage, in later generations, I am afraid that as long as elementary school students who have learned the Olympiad can report the answer in one go, there is no need to resort to cheating.
Isn't it self-defeating to use this kind of elementary school difficult questions to test yourself
"Hehe, if you want to renege on your debt, just say so, why bother to make such an excuse." Li Yi curled his lips, looked at him, and said with disdain.
Li Xuan's handsome face turned red. It's really not nice to tell the story of repudiation, but he is more eager to know how Li Yi got that answer.
"As long as you tell me how you solved this problem, in addition to the agreed one hundred taels, I will lose you another one hundred taels." Money is just a number to Li Xuan, what he is more interested in is The novel methods that Li Yi throws out every time.
Even Li Mingzhu's eyes were on Li Yi. She knew this question and didn't know why, so she tried it one by one. After spending a little time, she would naturally be able to find the answer, but he could figure it out so quickly. , if they didn't know the answer in advance, they used a method that none of them had seen before.
Money is just a number to Li Xuan, but not to Li Yi, it is a brick, a tile, a room in a big house...
"You just said—thirty-five heads on the top and ninety-four feet on the bottom?" He opened his mouth, expressing his acquiescence to Li Xuan's act of giving money just now.
Li Xuan nodded repeatedly.
"We're assuming, just assuming..." Li Yi stretched out his hand and gestured, "Assume that these chickens and rabbits are well-trained."
Li Xuan looked confused, and solved the problem as soon as he solved it. What does it have to do with whether these chickens and rabbits are well-trained
However, since Li Yi has never taken an unusual path, he still thinks to listen first.
Li Mingzhu frowned upon hearing this, and then quickly let go, obviously having the same thought as Li Xuan.
"If these chickens and rabbits are very obedient, clap their hands, and they will lift one foot..."
"How can there be such a solution?" Li Xuan couldn't listen anymore. Where are such obedient chickens and rabbits? Count it.
Li Yi glared at him, "Do you still want to know the way?"
"If you keep talking nonsense like this, the money will be gone." Although Li Xuan was stupid, he was not stupid to that extent.
"Continue to talk." Li Mingzhu seemed to understand something, with a strange light in his eyes, and urged.
Li Yi glanced at Li Xuan with complicated eyes, and Li Xuan understood what he meant.
He was laughing at himself for not being as good as a pearl.
However, Mingzhu was smart since she was a child, and Li Xuan discovered this when she and him were taught by her husband in the palace when she was young.
Although this is an indisputable fact, why is it so unpleasant in my heart
"Slap once, lift a total of thirty-five legs, and clap twice, lift a total of seventy legs. At this time, all the chicks are sitting in the cage, with no legs to count, and each rabbit has two legs. If there are twenty and four legs left in the cage, the number of rabbits is twelve, and the number of chickens is twenty-three."
As Li Yi opened his mouth slowly, Li Mingzhu's eyes glowed brightly, while Li Xuan was dumbfounded.
At this moment, I am afraid that only ten thousand horses galloping can describe the true feelings in his heart.
This mother can also do it
The problem that has troubled him for a whole day can be solved with just two claps
Didn't the old man say that yesterday
Saying that this is a problem that has been passed down from ancient times, it doesn't matter even 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 really is a monster!
Li Xuan's expression was seen by Li Yiquan, and he was not surprised by it.
There are no Arabic numerals in this world, no linear equations in two variables. Mathematics, at best, can only be called arithmetic, and it is still in an ignorant stage. It may take hundreds of years for a master of mathematics to appear against the sky, and his identity is astronomer or Taoist priest…
After all, these are not tested in the imperial examinations, and arithmetic is not highly valued. It is not uncommon for a chicken and a rabbit to be in the same cage.
The method he used just now is called the "leg raising method".
From the reactions of Li Xuan and Li Mingzhu, it can be inferred that "Sun Tzu's Mathematical Classics" either does not exist in this world, or it is too old, and this problem-solving method has been lost.
"It's really unimaginable that there is such a way to solve the problem." Li Xuan said in admiration.
In fact, he is not very interested in arithmetic. He just wanted to solve this problem and impress his teacher who taught him. After thinking about it for a whole day, he tried the correct answer in his mind, and then used Li Yi who found another way to solve it. method, only took two breaths.
"It's unbelievable, isn't it? It doesn't matter, we can try another method." Li Yi is still very kind, at least let Li Xuan feel that the two hundred taels of silver are worth losing.
"There are other ways?" Li Xuan exclaimed, moving his head closer.
"First, you need to remember a new way of counting..."
Li Mingzhu and Li Xuan watched Li Yi write and draw on the rice paper with a pen. Those strange simple figures were something they had never seen before. When combined, they turned out to be a new counting method.
Both of them had been educated by the nobles, and they had a profound background. Although this thing seemed novel, it was not difficult to understand. After Li Yi's simple explanation, it took a little time to roughly digest this set of rules.
I am amazed in my heart, this method is undoubtedly much better than Jing Guo's current counting method, and it is more convenient and simple...
"This is called an equal sign, this is a plus sign, a minus sign, and this cross can be understood as a number that is not yet known..." Li Yi didn't think so much at first, but when he really started to explain, he realized that he should spread this knowledge to them. , is not much easier than teaching two children who have just entered elementary school.
But the words have already been spoken, so naturally I can't give up halfway, so I have to be patient and move forward bit by bit.
After half an hour.
"That's it, solving the two unknowns is the number of chickens and rabbits." Li Yi breathed a long sigh of relief, and finally popularized it to them from beginning to end, feeling quite exhausted.
It's still easy to teach the bear children, just make up some stories to fool them. If Li Xuan asks this kind of question again in the future, he will definitely not do it without extra money!
"Understood?" He looked at the two of them and asked expectantly.
Although the process was a bit tortuous, if they understood it, they would feel a little comforted.
"No." Li Xuan said decisively, without the slightest hesitation.
Li Mingzhu also showed doubts in his eyes.
"Two rotten logs" Li Yi sighed in his heart.
"Xiaohuan, see off the guests!"
Seeing the little maid walking to the door, Li Yiguo broke his mouth.
"Uncle, it's time to eat..." the little maid stood at the door and said weakly.
"Don't be in a hurry, eat first, after the meal, you should tell me a few more times and you should understand." Li Xuan patted his shoulder, stood up, looked at the little maid with a smile on his face, Asked: "Miss Xiaohuan, where to eat?"