Li You's Tang Dynasty

Chapter 450 Chapter Nine Arithmetic Balloon Flying
Mathematics in the Tang Dynasty, now the main study is "Nine Chapters on Arithmetic". The main contents of "Nine Chapters on Arithmetic" are:
Chapter 1 "Fangtian": calculation of field area;

Chapter 2 "Corn": proportional conversion of grain grain;

Chapter 3 "decay": the problem of proportional distribution;

Chapter 4 "Shaoguang": Know the area, volume, find the length of one side and the length of the diameter, etc.;

Chapter 5 "Commercial Work": Civil engineering, volume calculation;
Chapter 6 "Equal Loss": Reasonable apportionment of taxes;

Chapter 7 "Prosperity and Insufficiency": the problem of double-handling;

Chapter 8 "Equations": linear equations;

Chapter 9 "Pythagorean": various problems solved by using the Pythagorean theorem.

These contents are equivalent to the mathematics of our elementary school to the first grade of junior high school. At this time, the mathematics of the Tang Dynasty is still average. Li You taught a little bit beyond the outline, and he taught binary linear equations.

The title Li You left for Di Renjie was: "Eight-armed and one No. 36 Yasha, three-headed and six-armed Nezha. Two places compete for strength to win, and if they don't compete with each other, the winners and losers add up.

The onlookers asked attentively, how many Yashas and Nezhas? "

This is a math problem in "Sun Tzu's Mathematical Classics".For students who have just learned the "binary linear equations", it is not difficult to calculate the answer, but in ancient China more than 1500 years ago, there were neither Arabic numerals nor English letters, so it was very difficult.

If it is modern,
Solution: There are X Yashas and Y Nezhas.

According to the title: X+3Y=36
8X + 6Y = 108
Solving this system of equations, we get: X=6
Y = 10
Then there are 10 Nezhas and 6 Yashas
But in ancient times, the difficulty of this problem was increased. It took Di Renjie three days to solve this problem, Su Qingjie even later, and Xiao Baoer and Li Mingda couldn't solve it at all.

Even though the two of you have learned binary linear equations, you still can’t do it. We also learned a lot of formulas. The math teacher yelled, you just need to use the formulas to apply it. It’s a pity, even so, Many people still don't know how to do it.

Soon Li Mingda viciously read out the math problem given by Li You. At the beginning, all the ministers were full of confidence. You must know that they have already eaten "Nine Chapters of Arithmetic" , it is expected that Li You will not play any tricks.

However, just when the ministers began to calm down to calculate, all the ministers present were dumbfounded in an instant, because at this moment, they found that Li You's question was really too difficult.

"Have you figured it out?" Li Mingda asked deliberately, this little fellow was still very mean.

All of a sudden, all the ministers started to sweat, and Li Mingda was giggling aside, but at this moment, Li Shimin made a relief and said, "Oh, I think it's almost time, Yuer, it's time Get ready to fly."

"Father, you have to do the questions first." Li Mingda quickly jumped out, but Li Mingda who was about to jump out just now was hugged by Li Shimin, feeling his father's meaning, Li Mingda didn't continue to make trouble , although she wanted the jokes of those ministers, but her father didn't want to, so there was nothing she could do.

At this time, Li You also hurriedly made a rescue: "Yes. Father, the people should have come around the same time. I will prepare now. The problem is a very common math problem. You don't need to do it anymore. Let's read this book first. Wang Feitian." After speaking, Li You bowed and went out.

The question was finally free, and the ministers were also relieved. Seeing Li You leave, all the ministers were also very grateful. No one thought that this question would be so difficult.

No wonder the clever Li Mingda didn't do it either, shaking his head slightly, all the ministers glanced at each other, and then silently warned themselves not to underestimate King Qi's teaching in the future, it was a bit embarrassing just now.

By the way, King Qi's teaching is so powerful, so why don't you bring your son, grandson and so on?

Li You walked out of the tent. He didn't know if he didn't come out. When he came out, he was shocked. At this time, the Furong Garden was already full of people. Originally, Li You thought that 2 people would come to Feitian this time, so Strict security was prepared, and all 1000 members of the Huben Army were thrown out.

But now when I come out and look, there are not only 2 or [-] people here, there may be [-] people, and according to outside news, there are still many people rushing here.

Li You looked around, and when he realized that the situation was getting out of control, he quickly went back to find Li Shimin, and told Li Shimin about the situation outside.

Some people will definitely ask, isn’t it good to have more people coming, this can promote Dunhua Square and improve Li You’s reputation. It is true that these are the benefits of having more people, but there are also disadvantages of having more people.

That is, it is difficult to control. In the beginning, Li You could control 2 people, but now it exceeds 10. In this case, Li You's Dunhua Square is not easy to control.

It would be bad if there was an accident, so Li You had to report it.

When Li Shimin was informed, Li Shimin issued an imperial decree and the Jinwu Guards arrived, and the pressure on Dunhuafang dropped suddenly. Afterwards, Li You went to find Mr. Yan and asked Mr. Yan to warn the hooligans in Chang'an. When there are many people, doing some illegal things, such as stealing money and trafficking people, is Li You's opposition. In the north and south, Li You also wants to find the other party, and he will never die with the other party.

As soon as Li You's ruthless words came out, those gangs that were ready to make a move stopped today, because the incident of the Shangshui Gang was still vivid in his memory, and the gangs in Chang'an did not dare to provoke Li You.

After doing all this, Li You finally felt relieved, and finally the flying show was about to start.

It was about eleven o'clock in the morning. At this time, the wind was sunny and there was no breeze at all. It was very suitable for the hot air balloon to ascend to the sky. Li You took Di Renjie, Xiao Baoer and Su Qingjie to check the hot air balloon again. After all, we were going to go to the sky later. , and without a parachute, Li You must guarantee 100% error-free.

The burner is the heart of a hot air balloon. It burns compressed gas with energy 150 times greater than that of a general household gas stove. Therefore, strict and detailed inspections must be carried out before take-off to ensure safety.

Not only should the pipeline be checked, but also after the inspection is completed and the pipeline is connected, an ignition test needs to be carried out to ensure that the burner is in normal use and the pipeline has no leakage.

"Boom!!"

The flames erupted from the burner made everyone around them scream in surprise.

"Wow!"

After the astonishment of a group of people, there was a lively chat:
"My God, what kind of fire is this? It's so fierce. Could it be the divine fire of alchemy among the Taishang Laojun?"

"It's terrible to have no culture, that's called Sanwei Zhenhuo."

"You are literate. Do you know where this fire comes from?"

"Eh!" There was a complete silence.

Then someone was surprised again: "The fire is so big, what if the things on it are burned?"

"Who knows? It is said that it is a ball, and it must breathe fire to fly."

"How could there be such a thing, could it have the power of ghosts and gods?"

"The power of ghosts and gods?" The word made the surrounding people slightly startled. After all, ghosts and gods were still highly respected in ancient times. As long as they didn't understand something, they would basically push it to ghosts and gods.

"Haha..." A burst of laughter came.

A man dressed as a literati smiled and said, "That's not the power of ghosts and gods. In fact, this thing has appeared before, can't you see it?"

"It has appeared long ago?" Everyone looked at the literati in surprise, and then someone asked respectfully, "I don't know sir, can you tell us what it is that has appeared long ago?"

The literati man didn't hold back either, but replied directly: "Kong Ming Lantern."

With a word of Kongming Lantern, everyone suddenly realized.

"Oh, no wonder I saw this, I always felt as if I had seen this gentleman somewhere before, and I knew it. Isn't this a super big Kongming lantern?"

"So that's how it is." The people all thought they knew the essence of the hot air balloon, and they all showed expressions of control.

It's just that Kongming lanterns and hot air balloons do look alike and have the same principle, but there is a big gap.

At this time, Li You connected the balloon and the hanging basket again. Here, it is required to follow the prescribed routine to ensure the fastening and safety of the connection.

Then more than a dozen artificial blowers began to blow air to the balloon. After the balloon must be blown up, it must reach a certain saturation. Stand up.

"Wow."

After the super-large balloon was lifted, all the people once again let out a sound of wonder, not only the people, but even Li Shimin in the tent and the civil and military officials of the Tang Dynasty got up one after another.

As soon as the 21-meter-high and 18-meter-wide behemoth appeared, everyone was shocked by its huge figure.

"It's really too big..." Li Shimin sighed.

"If you're not big, how can you fly into the sky?" Changsun Wuji stood behind Li Shimin and replied with a smile.

"If Feitian succeeds, I want to go up and take a look."

But as soon as Li Shimin finished speaking, a group of ministers quickly began to persuade them. Seeing the nervousness of the ministers, Li Shimin also laughed: "I know, I know, just now I just sighed, I won't go up. "

After hearing Li Shimin's assurance, the ministers were relieved.

However, the hearts of the ministers were down. Just after Li Shimin felt that he had made a humorous joke, Li Mingda suddenly leaned on Li Shimin's body: "Father, since you can't go, why don't you let my son go?" Erchen has already gone to heaven to play, what do you think?"

What else, of course, there is no door.

Li Mingda was speechless, looking at his father's resolute appearance, Li Mingda knew that he was useless, and at this moment, the hot air balloon began to slowly float up.

(End of this chapter)