In any case, Li Mengxi can indeed recite "The Art of War" by Sun Tzu, and he has indeed read the book.

Li Mengxi's conversation was already extraordinary, and Liu, Guan, and Zhang were very curious about who Li Mengxi was studying with a foreigner.

There is no such thing as a strange person. The reason why he invented a strange person was an excuse Li Mengxi gave himself to provide a reasonable explanation for what he had learned.

The three of them asked about the stranger's name.

Li Mengxi replied seriously, "My master has something to say. His name is taboo and cannot be told to others."

Li Mengxi replied like this, and Liu, Guan, and Zhang believed it to be true.

Hidden in the mountains, the world does not know its whereabouts or name. It is indeed the work of an expert.

The three of them asked again how they met the stranger, looking like they were gossiping.

Li Mengxi said that his master would not let him speak.

The three of them asked again where the stranger was.

Li Mengxi still said that his tutor would not let him speak.

It's actually because it's not easy to make up an excuse.

The first question is how to meet strangers.

How to answer?

"When a certain person was playing at the entrance of the village when he was a child, a stranger came. He said that a certain person's skeleton was amazing, and he wanted to take him to the mountains to teach him, so he went away with the stranger."

This can indeed be answered.

However, it cannot withstand careful investigation.

The second question is where the stranger is from.

How to answer this.

If you just casually say that he is from Youzhou.

Liu Bei asked again, where is Youzhou?

Now, how does Li Mengxi know where Youzhou is?

As a modern person, I know nothing about ancient geography and administrative divisions. It would be enough to say that I am semi-literate.

When asked several times like this, Li Mengxi only said that his master was idle clouds and wild cranes, and did not want outsiders to know his whereabouts. Liu Bei and Guan Yu could not find anything out, so they had no choice but to give up.

Liu Bei looked at Li Mengxi again, and now he heard that Li Mengxi had been taught knowledge by someone else. When he looked at Li Mengxi again, Liu Bei felt that this man's expression was calm and calm.

Since Li Mengxi was taught by someone else, Liu Bei was particularly curious about what Li Mengxi had learned.

You don’t have to answer the previous question, but you can answer this question, and there will definitely be a good answer.

It's good to show off your acquired knowledge and show your own value.

If you don't show your ability, wouldn't it be like a cone in a bag that no one knows about.

This action was that Li Mengxi used his only capital to sell the goods at the proper price.

Li Mengxi pondered for a moment and said, "A certain person has a very complex knowledge, including arithmetic, articles, transliteration of foreign languages, techniques for strengthening the body, astronomy, geography, medical skills, mechanical creation, some military strategies, etc."

Li Mengxi blurted out a string of nouns when he opened his mouth.

Regardless of other things, it’s impressive to be able to name so many names in one go.

Liu Bei and Guan Yu couldn't help but sit up straight. They looked at Li Mengxi with bright eyes.

Liu Bei was about to speak but stopped. He wanted to speak about teaching knowledge, but he felt it was not appropriate.

Li Mengxi deliberately showed what he had learned, and what he wanted was to shock everyone. Even if Liu Bei didn't ask, Li Mengxi would also say it.

"A certain person is good at calculations. Mr. Xuande can ask me about his calculations to see if his calculations are correct." Li Mengxi said with a smile.

Before Liu Bei could speak, Guan Yu asked from the side, "I have a question. Now there is a bamboo that is one foot high. When it is broken, it touches the ground. When it is three feet deep, how high is it?"

Guan Yu asked a random question, and after asking it, he waited quietly for Li Mengxi's answer.

After hearing this, Li Mengxi was stunned.

First of all, I didn’t understand what the question was at first, and secondly, “The height of the bamboo is one foot, and the bottom is broken to the ground, and the base is three feet, and the person who breaks it is asked how high it is.”

Li Mengxi didn't understand this question.

Li Mengxi exclaimed that the mathematical problems of the Han Dynasty were not too difficult. Li Mengxi thought that his mathematical knowledge was outstanding in the Han Dynasty.

Unexpectedly, it ignored practical issues.

What is a zhang, what is a chi, what is the last fold, what is three chi after removing it from the base.

Li Mengxi scratched his head and ears, no longer calm.

Liu Bei and Guan Yu saw this in their eyes, smiled at each other, and shook their heads slightly.

In the view of Liu Bei and Guan Yu, Li Mengxi was only seven or eight years old. Even if he was taught by a stranger, it was still unknown how much knowledge he could learn at such an old age.

"General Guan, how many feet is one foot?" Li Mengxi raised his head and asked.

This question is very common sense.

Even children in the countryside, even if they are illiterate, do not know how many feet there are in one foot.

Guan Yu was surprised that Li Mengxi didn't know the size.

"One foot ten feet."

"Oh." Li Mengxi nodded, then change the feet in the question into meters, the feet into decimeters, and use more familiar units to calculate.

"General Guan, we finally reached the ground, what's the explanation?"

Guan Yu looked at Li Mengxi for a long time, and finally asked Li Mengxi to come to his side. Guan Yu picked up the torch, took out the short knife from his waist, drew a simple diagram on the ground, and explained the meaning of the question to Li Mengxi.

It turned out that after just one glance at the sketch drawn by Guan Yu, Li Mengxi had a 90% guess that it was geometry.

That is to say, a bamboo tree, originally one meter high, was broken.

The straight line distance between the place where the broken bamboo pole touches the ground and the root of the bamboo is six decimeters. How high is the remaining height of the bamboo?

This question is the Pythagorean Theorem.

The existing data is that bamboo has a right angle side and is six decimeters long.

If you want to add the other right-angled side and the hypotenuse to one meter, find the length of the other right-angled side.

Pythagorean theorem plus equation.

Or a linear equation of one variable.

The question stem can be understood. Li Mengxi wanted to calculate, but he had no pen in his hand, so he could only calculate silently. After a while.

Li Mengxi came up with the answer. The question stem asked, the highest one is geometry.

The answer is, 4.55 feet.

Li Mengxi was about to answer, but then he thought again, this 4.55 feet, the mathematics of the Han Dynasty is different from that of later generations, and there should be no such decimal point.

Use fractions to answer.

"Four and eleven-twentieths, right?"

Li Mengxi answered.

"Yes!" Guan Yu nodded with satisfaction.

"I have one more question, would you like to answer it again?" Guan Yu saw that Li Mengxi's calculation was extremely correct, and he was determined to try again for such a smart boy.

"Today there are chickens and rabbits in the same cage. There are thirty-five heads on top and ninety-four legs on the bottom. How many are the chickens and rabbits?" Guan Yu asked.

This problem is the classic chicken and rabbit problem.

Li Mengxi could also understand the question at once.

After a little thinking, this problem can be solved by making a system of equations.

Let the chicken be x and the duck be y.

A chicken has a head, and a rabbit also has a head.

There are thirty-five chickens and rabbits in total.

x y=35.

A chicken has two legs and a rabbit has four legs.

That is, 2x 4y=94.

Calculate

y=12

x=23

That is, there are 23 chickens and 12 rabbits.

After Guan Yu asked the question for a few breaths.

Li Mengxi quickly finished the calculation,

"There are twenty-three chickens and twelve rabbits. Is that correct?"

Guan Yu nodded.

"Now there is a round log buried in the wall. I don't know how big or small it is. I saw it with a saw. It is one inch deep and the saw path is one foot long. What is the diameter?"

"Thirteen inches."

"Today there is a field of fifteen steps, from sixteen steps. What is the geometry of the field?"

"Two hundred and forty acres... square meters... steps?"

Li Mengxi was stunned.
Chapter completed!