When it was dark, Yu Zhiqian walked out of the palace with blank eyes and looked up at the sky.

It's terrible, it's really terrible, my mother, I have been talking about it from noon to now, especially after Yu Zhiqian accidentally revealed that Bai Jiahei was eaten, my mother started acting.

Then he began to shed tears, what was he in the harem, lonely and alone, just a white and black and dependent on himself, but now this kind of thing has happened, how can he live in the future?

Yu Zhiqian could only listen to the side, listening to his mother from a childhood to the present, if it weren't for Yu Zhiqian himself wearing the prince's clothes, Yu Zhiqian began to wonder if he was a child from a poor family......

It wasn't until sunset, after dealing with government affairs, that Yu Zhiqian's cheap father slowly came to the Fengyi Palace, and Yu Zhiqian was liberated.

The emperor was also negligent, thinking that the queen said that Yu Zhiqian should not talk about herself again in an afternoon, but he didn't expect the queen's sudden combat power explosion today, and directly turned on the fighting mode, and after talking about Yu Zhiqian, he began to talk about the emperor.

And Yu Zhiqian took advantage of the time when his father was nagged by his mother, secretly left the Fengyi Palace, looking at the sun that had already set, Yu Zhiqian was like a world away, he just went to ask for a peace, and just a day passed?

Yu Zhiqian shook his head, slowly left the palace, and returned to the East Palace.

In the next few days, Yu Zhiqian found that his route to find explorers was surprisingly smooth, and in less than three days, nearly twenty people were recruited.

After Yu Zhiqian gathered everyone, he found that this group of people did not seem to be simple, they were not simple people, at least the temperament of a soldier could be clearly seen on his body, and people who were soldiers in every era had the momentum of being soldiers.

The sergeants of the Yu Tang Empire, everyone has to train every day, although it is not as strict as the PLA, but every move can still see some clues, Yu Zhiqian can instantly understand that these people are his father's people.

After the last time he entered the palace to report, the emperor was still moved by his own words, so he found some people to use for himself, this group of people should be people in an army under his father, Yu Zhiqian didn't know, and even never saw it, after secretly inquiring, this group of people did not admit that they had been soldiers, Yu Zhiqian thought for a while, since people were unwilling to say, Yu Zhiqian did not inquire much, after all, he was the emperor, there was no secret in his hands, and the throne was already unstable.

"You have only one mission now! Find this river, this river is called Heilongjiang, and the local people should know where it is! ”

Yu Zhiqian did not directly ask this group of people to go to the Bering Strait, it was simply impossible, step by step, to slowly establish a propulsion base, and at the same time develop the navy, and the two sides developed together.

You may not find the American continent for a year or two, but as long as you persevere, you will definitely be able to find the American continent!

"Heilongjiang, according to legend, there was once a black dragon inhabiting, so the locals called this Heilongjiang, after finding Heilongjiang, some people were left to set up a forward sentry in the same place, and some people immediately returned to look for help from Liaodongdao!"

"Whoa!"

After the group of people wrote down the order, they took the rough map drawn by Yu Zhiqian and handed it to the leader, this guy is called Xu Xiake......

Yu Zhiqian did not let them go to death, but prepared all kinds of props, first of all, there were a total of twenty dog sleds, which were stuffed with various materials, in addition, there was also Yu Zhiqian's warrant, and all Daozhou along the way should meet the needs of the expedition as much as possible.

After Yu Zhiqian watched the group of people leave, he stared at them for a long time, and then slowly turned around and returned to his East Palace.

Zhang Xiaojing looked at Yu Zhiqian: "Your Highness, you care about these people very much!" ”

"Some of these people may never come back, but as long as someone is alive, they are heroes, and if they can successfully complete the mission, they will be remembered by history!"

Hearing Yu Zhiqian's words, Zhang Xiaojing was stunned for a moment, he didn't expect Yu Zhiqian to speak so highly of the team this time, and he still didn't understand why Yu Zhiqian did this!

"You'll find out later!"

At the time of the expedition's departure, a rumor began to circulate along the southeast coast.

"Did you hear that? There is endless rice and all kinds of spices in Nanyue! ”

A fisherman whispered to his companion.

"Where did you hear from that!"

"I heard people say in Quanzhou, I don't know the real price, tsk, don't you have one of the fishermen in Nanyue? The last time there was a storm at sea, didn't you save one, you went home and asked! ”

"We don't understand the language they speak, so what can we ask!"

"Let's get some money, find someone who understands South Vietnamese and ask, don't you know the truth, if it's true, we will be rich!"

Another fisherman was stunned for a moment, not understanding what this fortune meant: "Fortune, what fortune!" ”

"You stupid, how expensive spices are now, if we can find a route to Nanyue and secretly transport some spices back!"

"Seriously?"

"If it's true, just ask!"

"Good!"

In the afternoon of the same day, a dark-skinned guy came to the fishing village, this guy was from the Yutang Empire, but he could understand the words of Nanyue, and several fishermen spent thirty copper plates to invite him, ready to ask!

After the third day, everyone in the fishing village knew one thing, that is, Nanyue really had the spices they wanted and endless food, and the fishermen around them were also fishermen from Nanyue......

Five days later, two fishing boats set off from Quanzhou Port and headed for South Vietnam.

In addition, in many small fishing villages along the southeast coast, more or less people have received the news and began to be moved.

In the space of more than ten days, there were more than 30 fishing boats, full of dreams, to find pirates...... No, to find the sea route of South Vietnam, they have only one dream, that is, to find the sea route of South Vietnam and transport back the grain and spices of South Vietnam.

These news were spread by Yu Zhiqian, most of the people of the Yu Tang Empire lacked the spirit of adventure, but the fishermen along the coast were different, these fishermen begged for a living at sea all the year round, and many people died in the sea every year, this group of people is the most fighting spirit among all ordinary people.

These people live in poverty, and now they have a chance to get rich, and some people who don't want to be so poor all their lives have begun to go to the sea, which is also what Yu Zhiqian wants to see.

When this group of people who go to the sea bring back wealth from the sea, more and more people will start to go to the sea, and this group of people will fill the vacancy of the Yutang Empire on the sea, although it is only a civil act, but when they explore a part of the sea routes, the ships built in Dengzhou can also be launched, and when the time comes......

Yu Zhiqian didn't pay too much attention to what happened on the southeast coast, it was just an idle move, and now Yu Zhiqian is teaching the officials of the household department mathematics in the East Palace, Arabic numerals to be precise.

Yu Zhiqian looked at the group of household officials below who were as stupid as pigs, and couldn't help but wonder if there were some problems in the imperial examination of the Yu Tang Empire.

It's been three days, and this group of people can't do simple multiplication within ten, Yu Zhi hung a few of the worst grades at the end to warn, but it is still useless, and it shouldn't be enough.

As for why Yu Zhiqian wanted to teach the household officials to learn mathematics, the matter still had to go back to five days ago.

After Yu Zhiqian sent off the expedition team, he also began to prepare for the New Year, and there was less than a month before the New Year, and the entire Chang'an City began to be lit up.

Now there is no Gregorian calendar, the date is the lunar calendar, it is already December 7, and there are still 23 days before the New Year.

According to the custom, the household officials have to come to the East Palace every month to collect taxes, every month, but after the end of the year, they will also check the accounts, and count the tax payment situation of the East Palace in the past year and some other things.

This matter is not only for Yu Zhiqian to be investigated, but also for Cheng Biting Jin, Wu Guogong and other nobles.

The household officials came to Yu Zhiqian's East Palace, and after Shen Wansan took out the account book, none of these household officials could read the account book of the East Palace, except for the words written on it, none of the symbols and things knew it.

The household officials looked at each other for a while, and they didn't know what to do, so they quickly reported the news, and finally reached the ears of the emperor.

"Rebel, what's going on with your ledger?"

The emperor looked at Yu Zhiqian while drinking tea, but he was also thinking in his heart, the prince is the one who takes the lead in paying taxes, if Yu Zhiqian evades taxes, the emperor will definitely not believe it, so there may be some problems in the middle.

He also glanced at the account book, and the emperor didn't know it, and he didn't know what was recorded on it, only the words "expenditure", "income", etc......

Yu Zhiqian looked at his cheap father a little confused, quickly picked up the account book on the ground, and after looking at it for a while, he touched his head: "Father, there is no problem with the account book!" ”

"No problem, what's the ghost painting on this?"

"It's the number!"

"Numbers?"

The emperor's eyes narrowed, knowing that this was something that the prince had learned from the immortal world, and his fingers tapped on the table: "Tell me what this number means!" ”

"Father, these numbers are 0 to 9, the relative is our one to Jiu, but this kind of number is more simple, easy to record, you look at the traditional ledger, it records 1,365 stone grain, you need to write so many words, but here you only need to write 1365 stone!"

Yu Zhiqian was afraid that his father would not understand this meaning, so he directly took out a piece of paper and began to write, and after writing, he gave it to his emperor's father to read: "Father, can you understand this way?" ”

The Emperor looked at the four numbers on it and nodded slowly.

"How do you represent that!"

"That's it!"

Yu Zhiqian wrote out 2, and the emperor read it for a while: "What about picking?" ”

"Father uses 1 plus a 0 for 10, plus two for 100!"

After the emperor heard this, his eyes lit up, he knew what this number meant, his fingers kept tapping, and asked Yu Zhiqian to take out the account book that he had thrown down before, and look at it carefully.

After listening to Yu Zhiqian's explanation, the whole ledger seemed to be slightly understandable, and soon the emperor found a place similar to X and pointed: "What does this mean?" ”

"This is a multiplier sign, the father and the emperor two 2s add up to 4, and 3 2s are six pairs, right?"

"Hmm!"

The emperor nodded, the emperor didn't understand mathematics very well, but he still pretended to be calm and nodded, he couldn't show the prince that he didn't understand.

"Then use this symbol, which means that multiplying 2X3 is 6, in this way, you don't need to write 2+2+2, three 2s are easy to write, but what about a hundred? My symbol is 2 times 100 is 200! ”

Yu Zhiqian kept explaining this way, the emperor kept nodding, and casually picked up the piece of the household next to him and looked at it, the series of numbers on it made his head foggy, and he couldn't understand it at all, and then looked at the bill of the prince's East Palace, although it was not clear at a glance, but at least he could see the content of it at a glance.

"It's a good thing, why don't you take it out sooner!"

After Yu Zhiqian heard this, he scratched his head: "Father, many things are inadvertently remembered, I don't know how useful it is, such as this number, I will also hand it over to Shen Wansan to keep accounts, if my father wants to learn, my son can give it to my father!" ”

"It's a good number, but it's easy to be tampered with!"

The emperor thought for a while, and thought of the key points, such as the two numbers 6 and 8, as well as 1 and 7, and so on.

"Father, don't worry, look here!"

After Yu Zhiqian finished speaking, he dotted the last position of each page of the ledger, and there was a total on it, first writing a string of numbers, and then a string of numbers written in a man in parentheses.

"What is this?"

"Father, the statistics here, if someone tamperes with the numbers, but they can't be changed here, if you push it backwards a little, you will find that the number of words has been tampered with!

"A good idea, indeed!"

The emperor nodded slowly, thought for a while, and had already made a decision in his heart.

"Xuanhu Department Shangshu enters the hall!"

“……”

As a result, Yu Zhiqian accepted the task of teaching the officials of the household department to learn this kind of number.

When Yu Zhiqian left the palace again, he didn't feel too emotional, if it wasn't for the emperor discovering the number, Yu Zhiqian himself would have forgotten, Arabic numerals can really improve work efficiency, it is a good invention, Yu Zhiqian even wants to take this thing for himself.

"Yu Zhiqian's numbers?"

Yu Zhiqian thought about it for a while and felt that this name was not bad.

"I just don't know what year Arabic numerals were invented!"

After saying a word to himself, Yu Zhiqian prepared to go back to the East Palace to prepare for the training of the household officials.

ps: I filmed a scene for a day today, there will be tomorrow, there may be the day after tomorrow, I just wrote it, the update may be a little unstable in the past two days, I try to ensure that it is constantly updated!

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Sogou