I was engaged in infrastructure construction in the Han Dynasty [Transmigration Book]

Liu Tan's first reaction after hearing this was: Who is this?

Miao Rui seemed to see that he had forgotten about such a person, and quickly reminded him, "It's the crazy student who stopped the car last time."

Liu Tan was shocked when he heard this. How long has it been? Half a month, right?He thought the other party had given up a long time ago, so he didn't take it to heart, but he didn't expect that this person really struggled with this question for half a month?

To be honest, this question is actually a bit of a foul for this person, because it is actually not difficult to solve the problem. Addition, subtraction and a little division are all right, but it requires a little clever thinking. Solve problems in complex ways.

But no matter how complicated it is, Liu Tan rarely meets people who can spend half a month to solve a problem.

He was a little curious for a while and said: "Go and find out if this person solved it by himself, and has he really been solving this problem for the past half month?"

Miao Rui immediately gave orders and asked at the same time: "His Royal Highness, this person is at the gate of Shi Heyuan now, and his clothes are messy. If you want to see him, I'm afraid you have to ask him to clean it up."

Liu Tan raised his eyebrows: "Are you concentrating on solving problems and even ignoring your own personal hygiene image? Forget it, let someone take him to wash up first, prepare the car, and go to Shi Heyuan."

On the way to Shiheyuan, Liu Tan got the news that this Kaiguan really rented a private house in Chang'an, and then locked himself in the house to solve problems, and basically didn't leave the house for half a month. They all gave the aunt next door some money and asked her to send them.

After Liu Tan found out, he couldn't decide for a while whether this person was really obsessed with mathematics, or if he was determined to get ahead.

However, with his persistence, as long as he doesn't go astray, it's easy to get ahead when he encounters an opportunity.

It's just that the word "opportunity" is already difficult for ordinary people. There is no imperial examination these days, and they are all recommended to be officials. Unless the court is really short of people, or Liu Che thinks that these people can't fight, then he will issue an order to the world to seek talents.

Although Liu Che has announced many times, in fact, those who can enter the officialdom as a commoner are basically very rare.

Liu Tan suddenly became very interested in this person.

When they arrived at Shi Heyuan, Kai Guan had already packed up and waited quietly for Liu Tan.

When Liu Tan saw him, he seemed to see the unkempt scientific researcher in his impression.

Although Kai Guan's image at this time is not bad, and he is quite clean, but his eyes are black and white, his face is pale, and he looks a little swollen, seven parts human and three parts ghost.

It was the first time for Kai Guan to meet Liu Tan, and he was so excited that he stumbled a bit when saluting, and he never dared to look up at Liu Tan.

After sitting down, Liu Tan asked, "Have you solved it?"

Kai Guan's voice trembled a little: "It's solved...it's solved."

Liu Tan wanted to laugh seeing him like this. Sure enough, it's never the appearance that brings pressure to people, but the status, which is deeply recognized in people's hearts.

Otherwise, Liu Tan's image can be said to be very gentle and harmless, and it would be impossible to scare Kai Guan like this.

However, Kai Guan's appearance made him vaguely familiar, and after a little thought, he realized that it was exactly the same as when he saw Liu Che?

Liu Tan subconsciously imitated Liu Che's posture and sat on the seat and said, "What's the answer?"

Kui Guan said, "There are twenty-three pheasants, and twelve rabbits."

Liu Tan nodded: "Yes, it is indeed the answer, come, tell me how you solved it."

I don't know if he is very confident in his thinking of solving the problem, Kai Guan finally raised his head and glanced at Liu Tan. Suddenly the heartbeat accelerated.

He looked away, tried to calm down, swallowed his saliva and said: "Caomin, Caomin is assuming that the cage is full of pheasants, then 35 pheasants should be 94, and there are 24 pheasants in the cage, so it is less." 140 feet, if the cage is full of rabbits, it will be 94 feet, which is 46 feet more than 24. Rabbits have two more feet than pheasants, so the less 46 feet should be rabbit feet, because two rabbit feet have been counted before. So as long as two rabbit feet are counted, there are twelve rabbits, and the extra 23 feet are the two feet of the pheasant, so the pheasant should be [-]."

After Kai Guan finished speaking, he asked a little nervously: "His Royal Highness, look... Is Cao Min right?"

Liu Tan... Liu Tan has been dazed by his series of pheasants and rabbits at this time, and he begins to wonder if Kai Guan has been competing with rabbits and chickens for half a day.

In fact, this method is indeed correct. Of course, there is a simpler and clearer method, but Liu Tan does not want to discuss this issue with him.

He nodded and said: "The idea is good. Although it is a bit complicated, the answer is correct."

Kai Guan was very happy after hearing this, but he didn't ask what the simple method was. Liu Tan preliminarily judged that this person should not be a person who simply studies spells, or that he doesn't have such a persistent liking for spells.

But this is not a big deal, there are very few people in this world who can study a subject without sleep and food.

In Liu Tan's eyes, these disciplines are nothing more than tools to help human beings better understand the world and survive better.

He admires those who keep studying, but he doesn't think that Kai Guan is not pure enough.

But he still asked: "Are you interested in arithmetic?"

He wanted to see Kai Guan's temperament, because he said before that he liked spells, if Kai Guan just wanted to cater to him, at this moment the other party should simply admit that he likes spells.

However, after hesitating for a while, Kai Guan said: "His Royal Highness, Caomin only had a superficial understanding of spells before."

Liu Tan was surprised: "Oh? You can't answer this question with a superficial understanding."

The superficial understanding these days is not the kind that everyone in the later generations can add, subtract, multiply and divide. Basically, being able to do addition and subtraction well is already pretty good.

Kui Guan said: "Caomin... After Caomin got the question from His Highness, he went back and found some books to study for a long time before he solved it."

Liu Tan was shocked. There are actually very few books about mathematics now, and Kai Guan, a commoner, can get even less. Maybe they are really just some introductory books.

And he was able to solve this problem just by looking at these. Isn't this a genius?

Liu Tan was really interested in him at this time, and couldn't help but ask, "What about now? Do you like spells?"

Kui Guan was silent for a while before he said: "If you want to be used by His Highness, you should probably say you like it, but...the grass people have the ambitions of the grass people, but also the responsibilities of the grass people, and the art needs to be studied with great concentration, and the grass people really... have no intention of doing this. "

Liu Tan smiled: "You are honest, well, everyone has their own ambitions, and I can't force you, but I may not have a place for you to display your talents here."

Kui Guan said firmly: "At least there is a chance, otherwise, with the background of grassroots, I am afraid that I may not have this chance in another ten or twenty years."

Liu Tan nodded, no matter how capable this person is, his temperament is not bad, at least he knows how to tell the truth.

He thought for a while and asked, "Then tell me, what are you good at?"

Kai Guan looked up at Liu Tan and said, "I dare not say that I have an unforgettable memory, but my memory is excellent."

"Excellent memory? What's the best method?" Liu Tan is generally interested in this. He was admitted to one of the top universities in China. Before entering the university, he also felt that he was very talented. In addition to this, he has various other advantages, but he seems to only know how to read.

Such a person has seen a lot, and he doesn't think there is anything special about it.

Kai Guan said in a deep voice: "Where the grass people go, they know the geography along the way."

Liu Tan was stunned for a moment, does this mean to remember the way?

No, no, it will be brought to him specially to say, so it must be more than just that.

Liu Tan asked, "How much do you know?"

"The topography, the amount of plants, and the direction of the river are all familiar."

What the hell!

Liu Tan was shocked, this is not an ordinary talent in geology!

In order to make sure that he understood correctly, he asked earnestly, "How can you prove that you have memorized everything?"

Kui Guan said: "Cao Min has all been recorded. If Your Highness doesn't dislike it, please watch it."

Liu Tan said very simply: "Bring it!"

Then...he saw the bamboo slips with the characteristics of the era of living alone. Of course, the bamboo slips these days don't use carving knives but pens and ink.

The teeny-headed Han Li on the bamboo slips is very beautiful. If it was in the era of imperial examinations, he could have a job just for this one character.

Liu Tan carefully read the records on the bamboo slips.

It can be seen that it may be the first time for Kai Guan to record these things, and the way of recording is very free, basically just write where you think of, or see where you see, and there are some traces of addition and modification in the middle, see Later, he didn't record while walking, but waited until he stopped and wrote it down according to his own memory.

What Kai Guan gave him was the terrain near Chang'an, presumably to make it easier for him to verify.

But to be honest, since Kai Guan regards this as his selling point, Liu Tan believes that he will not deceive himself.

Liu Tan didn't speak in a hurry after reading it, which made Kai Guan a little worried. He knew that his specialty was nothing, and it could even be said to be very tasteless, not to mention being an official, even if he was an aide, no one would like it. .

Coming to talk to Liu was basically his last attempt. If it didn't work, he decided to return to Shuofang to inherit the family business.

It just so happened that Liu Tan felt that his ability was quite good, and after thinking about it for a long time, he suddenly asked, "Can you draw?"

Kai Guan's heart sank immediately, and he said in a low voice, "I'm not very good at it."

Poor people always use bamboo slips for writing, so how can they learn to draw?

Learning to paint requires paint, wood or paper, or even slate. Of course, cowhide or sheepskin can also be used, but this is too extravagant, and ordinary people cannot support it.

In fact, there is no such thing as a painter in this era, after all, there are too few people who know how to do it.

Liu Tan was a little regretful when he heard it, but soon he was not so regretful. If he doesn't know how to draw, it has the advantage of not being able to draw, so he can learn from scratch.

He thought of this and said: "I can give you a chance, and I can teach you some drawing methods, but I have conditions."

After hearing this, Kai Guan's heart beat faster, and he couldn't help but swallowed and said: "As long as His Highness is willing to give Cao Min a chance, no matter what the conditions, Cao Min will agree!"

Liu Tan said with a smile: "I haven't said it yet. It's too early for you to agree now. This condition may be too much, but... I still want to say that if you really stay, you will not be allowed to leave Chang'an for the rest of your life without my order." Half a step, and you have to bring your family to Chang'an, if you dare to violate it, you should be able to imagine their fate."

After hearing this, Kai Guan was stunned. Although he didn't understand why His Royal Highness the Fifth Highness made such a request, he guessed from his simplest thinking that the more reused the higher the request.

So he gritted his teeth and said, "Grassman... willing!"

Liu Tan nodded and said: "Okay, but I don't believe in the verbal promise. I will ask someone to draw up the paperwork later. Don't worry, I won't make you a slave or a handmaid. It's just a restriction."

Kai Guan finally couldn't help asking: "Your Highness, what do you want me to do?"

Liu Tan smiled slightly: "Draw a map!"

The author has something to say: Liu Tan: Once you enter my door, you are mine. If you run away, don’t even think about running away. Prepare to sell yourself.