"Song Jiulang, if you want, please come with me."

Song Jiu worked very hard to find this thing, and he was almost ready to go to Tianzhu to find it. He was not a big shot, so someone would harm him. He said, "Please take me there."

Leaving the dock and walking along the river embankment. As the twelfth lunar month approaches, all the willow forests on the river embankment withered, and the river gradually opens up here, and the water surface is calm, like a silent and depressed landscape painting. However, the water and soil are not damaged severely. Although the river water is a little turbid, it has a slightly blue-white meaning. The subtle waves hit the shore, and you can see a little snow. The sound of the waves is slight, like my mother's gentle shaking song. It should be said that the Yangtze River is very beautiful now, so I don't know if spring is coming, can you see the river water as green as blue when spring comes.

The hobby in my previous life has occurred again.

But in this journey, there is a place where Song Jiu wants to go, and he must go to Wulingyuan.

After getting off the river embankment, a small boat was moored by the river. The owner of the boy in blue was on the boat. The three of them randomly found a willow tree to tie the horse. Following the boy on board, a very common boat, that is, a relatively luxurious passenger ship, which is a sail mast, oar slalom, and a boat building. It was not big, two small houses were the size of a small house, standing on the deck. But when the three of them got in, the decoration was very luxurious. The walls were inlaid with precious wood. What kind of wood was it, Song Jiu didn't know, but he felt that the wood pattern was very beautiful. There were also felt blankets on the ground, there were tables, and some other arrangements. In the middle, there was an old man with a long face, about sixty years old, hugging a pretty female 14 or fifteen years old.

I am not too repulsive to Song Jiu. In this era, I was not like this in my previous life. I just did it publicly and the other did it publicly. At most, Song Jiu would not do it, but people have changed. God knows whether he will be like this old man when he is old.

The old man wore a gorgeous brocade robe, with a gentle temperament and a very handsome old man.

However, Song Jiu was stunned for a moment, because he was very familiar with the old appearance, and hesitated: "Weng Weng, where have we seen it?"

"Song Jiulang, three months ago, I and Tian Fuqing went to your Song Dynasty Tokyo City to attend the Empress Dowager's funeral. Did you see me then?" the old man said frankly.

"Three years ago?" Song Jiugeng was stunned. Where were I three years ago in October? By the way, I was in Yunnan at that time, but not for tourism, but for business needs. I stayed there for a long time. But this time, more than a thousand years later.

Song Jiu suddenly realized it first, and then realized that it was wrong. He already knew who the elderly in front of him was. Han Xizai knew him, not a real person, but a painting, "Night Banquet Picture". However, Han Xizai in the painting was obviously younger, looking like a man in his thirties, with darker eyebrows and beards, rather than the old man in front of him. He had many wrinkles on his face, his eyebrows and beards were very thick, but he could see some grayness. Only the same thing was vaguely seen in his eyes.

Song Jiu didn't know whether this painting was released. According to the tour guide, the background of this painting was when Li Yu was ascending to the throne, and he was extremely suspicious and killed many ministers from the north. Song Jiu was not very clear about the Southern Tang Dynasty. Is the killing process killing as soon as he succeeded to the throne or killing it carefully? The former painting came out, but the painting was not yet released. In order to avoid disaster, Han Xizai indulged in the mood. Li Yu was dissatisfied with Han Xizai's debauchery and sent painter Gu Hongzhong to sneak into the Han family and painted what Han Xizai did, so he had the famous painting in later generations. But even if he knew it, he couldn't say it. Song Jiu asked hesitantly: "Are you a bachelor of Han Xizai?"

It is impolite to say this, at least you cannot say the name directly.

Han Xizai was not angry, and said lightly: "Han is exactly."

"Scholar Han, who Gu, asked me?" Song Jiu was thinking in his heart that the picture of the night banquet was really a bit elephant. It doesn't matter whether the elephant or not, and he has to think about the main business. It cannot be said to be a stone. Before its function came out, it was at most a gem. The price was high and low. Han Xizai was a big shot in the Southern Tang Dynasty, so it didn't matter. The Song Dynasty didn't get Ezhou for a long time, and it was also stolen from the Southern Tang Dynasty by the Later Zhou Dynasty. Even if Han Xizai had the intention, he would not be able to fight back to Ezhou. The question is whether it is worth it?

"Song Jiulang, sit."

Song Jiu was just a little nervous when he saw Zhao Kuangyin. He was afraid of Han Xizai and sat down calmly.

Han Xizai smiled slightly and said, "It turns out to be a famous scholar."

But this made Song Jiu feel embarrassed and said, "Sir Han, don't praise me, just talk about serious business. I'm fine. Your vocation will be made by your political enemies."

"Han came on the order of the lord, who is making a fuss?"

"Lord?"

"Song Jiulang, your three arithmetic problems have stumped many arithmetic masters in our Southern Tang Dynasty."

"The path, the tricks of worms are not worth mentioning."

"Can you tell Han the answer?"

"Mr. Han, those three questions were asked by the court. You, the Southern Tang Kingdom, got the answer. I can still give thirty questions or 300 questions, or I can only get the reward of five thousand pieces of silk from my court. That would be a great fortune for individuals, but what's the point for the country?"

Indeed, in a sense, if Song Jiu does not announce the answer, they may have no solution.

For example, there is a question: The husband is a businessman, and the money is a dealer with the people in the village. After the maritime ship goes to the business, in addition to the goods from the owner, there are 5,88 taels of agarwood, 1430 packs of pepper (a bag weighs 40 song jin for a standard), 212 packs of ivory (the weight of ivory is combined, and one ivory is different in size, and it can have two, three, and four packs). It is a combination of A, B, C, and D. I came to collect the book yesterday, and there were borrowings for each other. A was assigned to the official.

The confession said that A was two taels of gold, four bags of salt, ten ways to make money, eight hundred taels of silver, three bags of salt, eighty-eight taels of silver, one thousand six hundred and seventy taels of silver, fifteen taels of silver, fifty-two taels of gold, fifty-five taels of gold, fifty-five taels of gold, eight zhu, a total of 424,000 guan, A borrowed the banknotes of B, B borrowed the banknotes of B, C borrowed the banknotes of Ding, and D borrowed the banknotes of A, and now all the borrowed items are returned to the original owner's name, so as to divide the goods evenly.

If this question is not translated, it will be difficult to put it in the future. However, if you translate it and then exchange the values ​​of the certificate, banknote, salt, gold and silver, then this question is not difficult at all, but it was one of the difficult problems in the Song Dynasty.

Because we need to list a four-element four-element equation.

But only one possibility is possible.

For example, in this question, there are things that are unknown now. There are two left in three, three, three, three, and five, and seven, and two left in seven, asking what are the things? This is the technique of seeking one, also known as the residual law of Chinese mathematics. It can be calculated by listing formulas, but if it is replaced by listing formulas, it will be difficult, even if even high school students will have a headache. But in ancient times, some people calculated it.

Originally, Song Jiu was disdainful of ancient arithmetic books. Dr. Zhang was teaching, and he also looked at it. It turned out that it was difficult to find a binary quadratic equation. Then he asked Dr. Zhang to calculate, and Song Jiu sat next to see how he used the calculation. After reading it for a long time, he didn't understand it at all. In the end, Dr. Zhang got it out. The answer was out, and Song Jiu asked, how did you calculate, Dr. Zhang explained. As soon as the result was explained, Song Jiu felt that he was listening to Hawking's paper report.

However, Song Jiu’s three questions were a bit complicated. If you can get one question, you will definitely not get three questions.

Han Xizai said: "Song Jiulang, please use tea."

"Thank you, Mr. Han," Song Jiu took a sip of tea.

Han Xizai took out a small bag from his arms and opened it. There were two stones inside, one slightly close to pink and the other light yellow. Song Jiu was not surprised that diamonds were not only colorless, but also various colored diamonds. It was probably colorless, because people didn't know its value at this time, and they would not bring it to the Song Dynasty. Most of the colored diamonds were brought, and they were sold to Chinese people as ordinary gems. Song Jiu looked at them again and looked at them. It seemed that they were large, one more than ten carats, one could be more than twenty carats, or even nearly thirty carats. But it was not diamonds, so he could not determine if they looked at it like this. So he said, "Master Han, can you please give me a try?"

"please."

Song Jiu picked up the big yellow stone and used its tip to scratch it on the glass bowl with a knife. In fact, it was more luxurious to use real diamonds to scratch glass, but it was impossible to make artificial diamonds to make glass knives in this era. Only real diamonds can be used.

It's also worth it. As long as glass can be produced, even if it is mass production, the price of glass will not fall in a few decades. Even if Song Jiu is lucky, he will find the best firing method, as well as the most suitable sand and other raw materials, and produce various exquisite glass, which can be anti-dumped to West Asian or European countries such as Dashi.

It’s not possible to have diamonds. You need some labor-saving tools to cut the glass.

But Song Jiu was very strong, and even though he had difficulty using the tip, a crack appeared when he pulled the glass bowl down hard.

It's it!

The hardness of other gems cannot keep up.

Moreover, these two diamonds are not small. Of course, for ordinary people, it is not big. It is impossible to cut it out. However, it takes a little effort to make it into several parts. Although there is a loss, it can be processed into several glass knives. Be careful, it may be divided into more than a dozen glass knives. But no matter how hard it is, with its hardness and current technology, it will be very troublesome to divide into several parts. Moreover, although Han Xizai took it out, it was not from ordinary people, but from Han Xizai himself, so how easy it was to get it?

Song Jiu swallowed his saliva. People don’t know its value now, but Song Jiu knows that no matter how big or color, they are all excellent diamonds. Although they are not world stars of hundreds of carats, with this size, if they are placed in later generations, how valuable are they?

I held it in my hand and played with it, almost reluctant to let it go.

After reading it for a while, he handed it to Han Xizai. He heard that this person is good. Zhao Kuangyin heard of his name and wanted to keep him, and even intended to detain him in the inn. Finally, Han Xizai resolutely wrote a poem on the wall of the inn:

I was originally from Jiangbei, but now I am a guest in Jiangnan.

When I returned to Jiangbei, I saw no recognizance.

The breeze blows my cold, and who will the bright moon white?

It’s better to go back, some people in Jiangnan remember it.

I am from Nanyang, Henan, Jiangbei, but when I returned to the Song Dynasty, I couldn't see anyone I knew. It would be better to go back, at least I still have my wife, children, and children in Jiangnan. Then I secretly sneaked back to the Southern Tang Dynasty, but this poem was written extremely gracefully, which made Zhao Kuangyin very melancholy.
Chapter completed!