Happy Little Scholar

"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. Tianlai Novel

If Li Yi gave the answer after this stick of incense or even within one stick of incense, he would be surprised, but it was within his tolerance.

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

And as soon as he finished asking the question, Li Yi could say the correct answer in one breath. This was not a human, but a monster.

This time, Li Xuan really guessed wrong. Just now, he suddenly jumped up like hysteria, which scared Li Yi. How could he listen to what this guy said.

Although he had seen similar questions before, the answer would be different if he changed a number, and there was no second possibility he said.

In the future, I am afraid that as long as the primary school students who have studied Olympic mathematics can report the answer to the problem of chickens and rabbits in the same cage, they will not have to cheat at all.

Using such a difficult question of primary school to test yourself, isn't it self-humiliation?

"Haha, if you want to default on your debt, just tell me. Why bother making up such excuses?" Li Yi curled his lips, looked at him, and said with disdain.

Li Xuan's handsome face flushed red. It was not nice to tell others that he was a prince, but he was more eager to know how Li Yi got the answer.

"As long as you tell me how you solved this problem, I will give you another 100 taels in addition to the 100 taels we agreed on." Money was just a number to Li Xuan. He was more interested in the novel methods that Li Yi came up with every time.

Even Li Mingzhu's eyes were on Li Yi. She knew the answer to this question but not the reason. She tried them one by one and spent some time to find the answer. But he could calculate it so quickly. If he didn't know the answer in advance, he must have used a method that they had never 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 mansion...

"You just said ------ there are thirty-five heads above and ninety-four feet below?" He said, acquiescing to Li Xuan's action of giving money just now.

Li Xuan nodded repeatedly.

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

Li Xuan was confused. Solving the problem is solving the problem. What does it have to do with whether these chickens and rabbits are well-trained?

However, considering that Li Yi has always been unconventional, he still thinks he will listen first.

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

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

"How can there be such a solution?" Li Xuan couldn't listen any more. Where could there be such obedient chickens and rabbits? If such a bizarre method could make sense, then just let the chickens and rabbits speak human language and tell the number of their kind.

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

"If you keep talking nonsense like this, you will lose the silver." Although Li Xuan was stupid, he was not stupid to that extent.

"Keep talking." Li Mingzhu seemed to understand something, and urged with a strange look in her eyes.

Li Yi looked at Li Xuan with a complicated look, and Li Xuan understood what he meant.

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

However, Mingzhu was smart since childhood. When he and he were taught by a teacher in the palace together, Li Xuan discovered this matter.

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

"Clap once, and a total of 35 legs will be lifted. Clap twice, and a total of 70 legs will be lifted. At this time, all the chicks are sitting in the cage, and there are no legs to count. Each rabbit has two legs left, and there are 24 legs left in the cage, so there are 12 rabbits and 23 chickens."

As Li Yi slowly spoke, Li Mingzhu's eyes were full of strange light, and Li Xuan was stunned.

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

This is also possible?

The problem that has troubled him for a whole day can be solved by clapping twice?

That old man didn't say that yesterday?

He said that this is a difficult problem passed down from ancient times, and it doesn't matter even if it can't be solved, because the master himself only knows the answer, not the specific solution.

He turned around and glanced at Li Yi------It's really a demon!

Li Yi saw all of Li Xuan's expressions, and he was not surprised at all.

This world has no Arabic numerals, no quadratic equations, and mathematics can only be called arithmetic at best. It is still in the stage of ignorance. It may take hundreds of years for a great math master to emerge, and his identity is still an astronomer or a Taoist priest...

After all, the imperial examination does not test these, and mathematics is not highly valued. It is not uncommon for a problem of chickens and rabbits in the same cage to stump the doctor of mathematics in the Imperial College.

The method he used just now is called "leg lifting method". It is not a joke on the Internet in later generations. The ancient math classic "Sun Zi Suan Jing" did solve this problem in this way.

From the reactions of Li Xuan and Li Mingzhu, it can be inferred that "Sun Zi Suan Jing" either does not exist in this world, or it is too old and this method of solving problems has been lost.

"It is incredible that there is such a method of solving problems." Li Xuan couldn't help but admire.

In fact, he was not very interested in arithmetic. He just wanted to solve this problem and impress his teacher. He thought about it for a whole day before he tried out the correct answer in his mind, and then used Li Yi's new approach. The method only takes two breaths.

"It's unbelievable, isn't it? It doesn't matter, we can try another method." Li Yi was still very kind. At least he wanted to make Li Xuan feel that the loss of the two hundred taels of silver was worth it.

"There are other ways?" Li Xuan exclaimed and leaned his head over.

"First, you need to remember a new counting method..."

Li Mingzhu and Li Xuan watched Li Yi write and draw on the rice paper. Those strange simple shapes were something they had never seen before. When combined, they turned out to be a new counting method.

Both of them had received aristocratic education and had profound knowledge. Although this thing seemed novel, it was not difficult to understand. After Li Yi's simple explanation, it took a little time to largely neutralize this set of rules.

I was 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 the equal sign, this is the plus sign, the 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. When he really started to explain, he now popularized these for them. Knowledge is not much easier than teaching two children who have just entered elementary school.

But the words had already been spoken, so naturally we couldn’t give up halfway, so we had to be patient and move forward bit by bit.

Half an hour later.

"That's it, after solving the two unknown numbers, we have the number of chickens and rabbits." Li Yi breathed a long sigh of relief and finally explained it to them from beginning to end, feeling quite exhausted.

It's still easy to teach a naughty kid. You can fool him by just making up a story. If Li Xuan asks this kind of question again in the future, he will never do it without adding money!

"Do you understand?" He looked at the two of them and asked expectantly.

Although the process is a bit tortuous, if they understand it, it will be a small comfort to their hearts.

"No." Li Xuan said decisively without any hesitation.

Li Mingzhu also looked puzzled.

"Two pieces of rotten wood" Li Yi sighed in his heart.

"Xiaohuan, see off the guests!"

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

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

"No hurry, no hurry, eat first. After you finish eating, you should explain it to me a few times and you should understand." Li Xuan patted his shoulder, stood up, and looked at the little maid with a smile on his face, Asked: "Miss Xiaohuan, where do you want to eat?"