After Qing Shuang entered, she did not say anything. She only quietly looked at Yang Xuan.
Yang Xuan was a little helpless. "Are you all so well-informed? I just came back and you're already here. "
Qing Shuang looked at him for a while. "This inn is owned by me. What do you think? I've been waiting for you here."
Yang Xuan sat down on a chair and poured himself a cup of tea. "What's the matter? You want me to be your son-in-law? "
Qing Shuang frowned. "Why are you doing this?"
Yang Xuan smiled. "Nothing. I just feel that if I become Qingxue's son-in-law like this, I'll suffer a loss."
Qing Shuang was speechless. "Suffer a loss? You feel that being the son-in-law is a loss? Qingxue's national strength is several times that of Yan's. Her wealth is innumerable. If you become Qingxue's son-in-law, when the princess ascends to the throne, you'll be second only to one person. You actually feel that it's a loss? "
Yang Xuan took a sip of tea and said noncommittally, "Your tea is not bad."
Qing Shuang did not understand what he meant.
Yang Xuan continued, "But I still like to drink a bit of Dark Night Fragrance. I'm used to it and can't change my taste."
Qing Shuang seemed to understand a little.
"Right, who became the son-in-law?" Yang Xuan asked.
"Yan Yi Xun. No matter if it's knowledge or martial arts, there's no other choice other than you." Qing Shuang said.
"Then why don't you hurry back and guard him?" Yang Xuan said casually.
"Did I say that I'm the princess?" Qing Shuang said indifferently.
"Whatever!" Yang Xuan shrugged. "Why are you looking for me?"
Qing Shuang looked at him again. She really couldn't figure out what this man was thinking. After a long while, she took out a simple ring.
"Storage ring?" Yang Xuan was stunned.
"Yes, it's a storage ring!" Qing Shuang did not deny it.
Yang Xuan smiled. This kind of ending was really good. He did not need to be the son-in-law and even received a storage ring.
"Is the result of the test real or fake?" Qing Shuang asked him for the last time.
"Absolutely," Yang Xuan answered without hesitation.
Qing Shuang threw the ring to him, then got up and went out. After walking for a long time, a sentence floated in, "You still owe a few days' worth of fees. Don't forget to settle the bill. Then, I'm sure we'll meet again! "
Yang Xuan then remembered that he had only taken out twenty gold taels that day, which was only enough for one night. But now, he was afraid that it would be more than five or six days.
"How stingy!" Yang Xuan said helplessly, "Until we meet again!"
After saying that, he looked at Zhang Heng, who was walking in.
Heng cupped his fists towards Yang Xuan and said, "Young Master Ren, please explain the method."
He didn't point out Yang Xuan's identity because it didn't matter. What he needed, or rather, what the Azure Snow Royal Family needed, was that method.
Heng took a pen and paper, and Yang Xuan didn't stand on ceremony. After taking the pen and paper, he drew a circle on the paper and then the diameter of the circle.
His drawing ability was really unflattering. Not only did the circle not look like a circle, even the diameter was crooked.
Heng frowned as he looked at it. He took the pen and paper and drew another circle. It looked like he had drawn it with a compass, and the straight line looked like he had drawn it with a ruler.
Yang Xuan's face didn't show the slightest bit of shame. He directly explained the circle drawn by Heng, playing the role of a primary school teacher.
"That's it. I call this fixed number Pi." After the explanation, Yang Xuan concluded.
Heng didn't answer. He was quietly thinking. After a while, he suddenly stood up and bowed respectfully towards Yang Xuan, "Mister is very talented, please accept this old man's bow."
Yang Xuan hurriedly helped Zhang Heng up, his face a little red. He felt ashamed to accept this bow.
Heng stood up and looked at Yang Xuan. He sighed and said, "I didn't expect Mister to have such a deep understanding of mathematics. Compared to Mister, I'm really like a frog at the bottom of a well. It's funny that I didn't even know it."
Yang Xuan explained, "I'm just standing on the shoulders of my predecessors. It's not worth mentioning."
He explained in a disguised way, but Heng thought he was just being modest. At this moment, Yang Xuan's position in his heart had reached the peak.
Heng looked at Yang Xuan again and said with some embarrassment, "Logically speaking, I should have left by now. However, I have a doubt in my heart that has puzzled me for many years. I would like Mister to answer it for me. I wonder if Mister can answer it for me?"
Yang Xuan nodded. Anyway, he had nothing to do now. He didn't lose anything by being Heng's mathematics teacher.
Zhang Heng was clearly overjoyed. He respectfully bowed to Yang Xuan as a disciple, before asking, "I wonder if Mister has done any research on the triangular shape?"
Yang Xuan was stunned. Was he going to discuss trigonometric functions? It wasn't that he didn't know how to do it, but he was afraid that Heng wouldn't understand if he said it.
"I have some research!"
Heng said happily, "That's great. I have a question. Let's say there is a triangular-shaped object. The two sides are straight and one side is slanted. If I know the length of any two sides, how do I know the length of the third side?"
Yang Xuan breathed a sigh of relief. Wasn't this the Pythagorean theorem?
However, when he really explained it to Heng, it took a lot of effort because he had to translate the formula of the Pythagorean theorem into the mathematical knowledge of this world. In this way, the difficulty of the explanation increased imperceptibly.
He couldn't directly tell Heng: A square plus B square equals C square. If that was the case, he would have to be an English teacher. He even had to explain to Heng what a square was and what a square root was.
After spending a lot of effort, Zhang Heng finally understood.
At this time, he was shocked by Yang Xuan.
"Master, please accept this disciple's bow!" As he spoke, he was about to kneel on the ground and kowtow to Yang Xuan.
"Hey, hey, hey, what are you doing? Get up quickly. It's dirty … Hey, why don't you listen?"
It wasn't easy to pull Heng up. Heng's attitude towards him was like seeing his own father.
"Master has taught this disciple a great deal. This bow is witnessed by both heaven and earth." Heng said respectfully.
Thinking about it, what Yang Xuan taught him, although in his previous life on Earth, was only elementary or middle school knowledge, the formation of this knowledge was the condensation of the blood and sweat of predecessors.
In fact, in Yang Xuan's previous life, the more popular the knowledge, the more classic it was. If it were to be passed down one by one in this world, it would definitely be earth-shattering.
Not to mention other things, if Yang Xuan taught the multiplication formula in the second grade of elementary school, it would definitely cause a huge change in science and engineering in this world. At that time, Yang Xuan would be worshipped as a god and be revered by the world.
After Heng left with a thousand thanks, Yang Xuan had the time to study the storage ring that he had almost sold his body for.
After scanning it with his spiritual sense, he was already overjoyed.
Although the space inside the storage ring was not big, only about the size of a bedroom, when Yang Xuan scanned it with his spiritual sense, the strange fluctuations that came from the ring attracted his attention.
Why could the ring form its own space? This was the question that he was thinking about now.
Could he simulate this kind of fluctuation with spiritual energy? If he could, then did it mean that he could open up his own space without relying on the storage ring?
Thinking of this, he was also a little excited.
However, after studying it carefully, he felt that something was missing, causing his train of thought to be interrupted.
He put all the things in his arms into the ring, and then watched them appear in his hands. He played with them happily. This strange feeling was too wonderful for words.
The next day, he went directly to the counter to check out of the room.
Of course, he paid the fees he owed very quickly. He would not let Qing Shuang laugh at him because of this.
After leaving the inn and going around the city, he returned to his original appearance.
When he returned to Meng Qingqing's house, he first went to refine some Heaven Reversal Pills. Then, after thinking about it, he refined some more Weight Loss Pills.
After a period of time, Meng Qingqing came again.
"You're injured?" Yang Xuan saw Meng Qingqing for the first time and his face sank.
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