"Yes! That's the number!"

Qin Yu nodded, then said to Li Shimin: "Do you know how to count?"

"Of course I know this thing. I have also studied nine chapters of arithmetic."

As an emperor, Li Shimin had to learn a little anything. If he had some knowledge about Jiuzhe Arithmetic, there was naturally no problem.

"Nine chapters of arithmetic."

Qin Yu nodded and said, "No, Lao Guan, you are getting started on this road of counting."

"getting Started?"

After hearing Qin Yu's words, Li Shimin became stunned.

These nine chapters of arithmetic can be said to be the most profound classic in this world, okay?

This kid actually said that he was getting started?

Is this obviously an entry into the house?

"That's right, Nine Chapters of Arithmetic is the most basic problem about mathematics. If you encounter something you don't understand in the future, you can come to my side to listen to it and ensure you will get something."

Qin Yu smiled at Li Shimin and said, "There is no end to learning mathematics. Mathematics is the foundation of all physics. I, Chang'an Institute of Technology, must regard mathematics as the most basic education. No matter what I study, I must learn mathematics well."

“…”

Li Shimin looked at Qin Xi's face and just wanted to say, are you too good at bragging?

"You said that Nine Chapters of Arithmetic is the most basic, so I'll give you a question."

Li Shimin looked at Qin Xi, who was pretending to be so arrogant that he immediately wanted to give him a hard blow.

"You can come out casually."

Qin Yu looked at Li Shimin and couldn't help but laugh.

I don’t need to say much about how basic mathematics in this era is.

No matter how difficult the questions he asked were, there was a limit. At most, he could have a primary school problem. In Qin Yu's eyes, this kind of problem was naturally not a problem.

"Now there is a pond that is one foot in size, and the reeds grow in the center. One foot of water comes out, and the reeds are led to the shore, which is as close as the shore. Ask about the depth of the water, the reeds grow in the geometry."

Li Shimin directly used a question in Nine Chapters Arithmetic. In fact, this question is still a bit difficult for him.

Because when he was doing this question before, he asked someone to dig a pool, find a rope, pull it out from the middle of the pool, and then just to the edge of the pool, cut off the excess, and then came to the answer.

He didn't believe that Qin Yu could figure out this answer quickly.

When Qin Yu heard this question, he painted on the ground and quickly said to Li Shimin: "The water is twelve feet deep and the reeds are thirteen feet long."

“…”

Li Shimin looked at Qin Xi with a look of surprise, and couldn't figure out how Qin Xi got the answer so quickly.

This answer is exactly the same as his answer.

Then he saw the ghost drawing talisman on Qin Yu's ground, and then asked: "You're going to draw the ghost drawing talisman on the ground, and then you'll get the answer?"

"Ghost Drawing Talisman?"

Qin Feng was so stern, and then said to Li Shimin: "Old Guan, it seems that although you have studied Jiuzhang arithmetic, you are not proficient. Do you know why I wrote these things on the ground? I just know that you don't understand the principles at all and want to explain them to you."

Qin Yu was not panicked at all when he lied.

In fact, he had no way to calculate the formula, and there was no way to calculate the formula. Although he knew the formula, his mental arithmetic ability was not strong, so he could only write it out.

It's just right to pretend to be a dumb at this time.

After hearing Qin Yu's words, Li Shimin didn't know what Qin Yu was thinking. He nodded and said, "You can explain it."

"Look at this picture, the pool is 1 zhang in size, and there is a water plant in the center, which means that this line is five feet."

Qin Yu pointed to one side of the right triangle he drew, and continued, "Next, this aquatic grass came out of water and pulled it to the riverside and disappeared.

Let's assume that the length of the aquatic plants is an unknown number, and then the water depth is this unknown number that is reduced by one foot.

According to the principle of hooking three, four, and five, the sum of squares of the Pythagorean is equal to the square of the string.

Finally, it was calculated that the water plants were thirteen feet long, and the water depth was 12 feet."

After listening, Li Shimin was stunned.

That's so simple?

Damn it!

I spent so much manpower and material resources to dig a pond and solve this problem. I thought I was very powerful and solved a difficult problem.

As a result, after listening to Qin Yu's analysis today, I was stunned.

"I understand the principle of hooking three, four, and five. Is this principle universal?"

Li Shimin said a problem in a daze.

Qin Yu slapped himself in the face. He originally thought the other party was on the first floor and he was on the fifth floor, but he didn't expect the other party to be in the basement.

Damn, I dare to boast that I have mastered nine chapters of arithmetic?

Tear a few eggs!

"The hook three, four, five strings, and are called Pythagorean theorem. Do you understand? Theorem!"

Qin Xi said to Li Shimin: "No matter how big the triangle is, as long as it is right angled, it must conform to the Pythagorean theorem!"

"I see!"

Li Shimin nodded suddenly and then said, "I didn't expect you to know Jiuzhang's arithmetic so well. Since that's the case, I'm relieved. Your academy has finally got a skill."

After Li Shimin finished speaking, he was still a little unsatisfied and continued, "But although you have passed my test, don't be complacent. In a few days, I will let Li Chunfeng come over and discuss the issues in Jiuzhe arithmetic with you, hoping that it will be helpful to you."

“…”

When Qin Yu heard Li Shimin's words, he immediately felt a sudden sweat in his heart.

What does it mean that I have passed your test? Are you such a fucking test?

What are you bragging about here?

I'm clearly guiding you, okay?

I want to discuss what Jiuzhe Arithmetic does?

Chapter Nine Arithmetic is so basic!

"Old Guan, don't let anyone come to me. I know Li Chunfeng, isn't he just a wise man? Although he is a bit awesome in fortune telling, I don't think he can do this."

Qin Shimin shook his head directly at Li Shimin.

Li Chunfeng and Qin Yu still know it.

This guy's Tuibei picture is very awesome.

Although this Tuibei picture was painted by Li Chunfeng and Yuan Tiangang.

But there were 60 copies of the Tuibei Pictures in total, and Li Chunfeng drew fifty-seven copies by himself.

Yuan Tiangang was just making up the numbers, but Li Chunfeng was the awesome one.

"Is his fortune telling really good?"

After Li Shimin heard Qin Feng's words, a trace of splendor flashed in his eyes.

"That's so awesome. Do you know that his Tuibei map can count two thousand years after the Tang Dynasty."

Qin Yu said seriously.

"Tuibeitu? What is this?"

Li Shimin looked at Qin Yu with a confused look on his face, not knowing what Qin Yu was talking about.

“…”

Qin Qi suddenly thought of something that the Tuibei picture seemed to be calculated by Li Shimin.

It seems that the Tuibei picture has not yet been released.

"I'm also talking nonsense. A bull-nosed Taoist priest can know what fortune telling can you do."
Chapter completed!