Otaku Engineer in Great Tang Dynasty

"Oh? Xiao Lang Jun deserves to come from Yanhuang Academy. He actually got the answer so quickly, please say it!"

Lin Wenyuan's eyes lit up and the smile on his face became more enthusiastic.

Tie Dan smiled confidently and replied: "I have calculated a correct answer, it is twenty-three. I wonder if it's right or not?"

Lin Hao saw that the iron egg is about the same size as him, but such a complicated math problem can be calculated so quickly without paper and pen. He couldn't help but patted the table and said excitedly:

"Damn! Bull! Han Li! I answered it so quickly! You deserve to be the legendary Old Demon Han! He is so powerful and his brain is so bright!"

(In "The Legend of Mortal Cultivation", because Han Li is cruel to the enemy, is very vengeful, and has a lot of ghosts, is a completely unwilling to suffer, so everyone unanimously calls him Old Demon Han)

Tie Dan's face was indifferent, but Lin Wenyuan's old face was dark, and he reprimanded: "Sit down!"

"Uh... yes, dad!"

Lin Hao quickly put away the excitement on his face and sat down honestly.

Mother Lin glanced at her son with a smile, and she secretly said that there was a drama in her heart. Maybe her son could pick up the interest in learning because of the iron egg!

Seeing that his wicked son was honest, Lin Wenyuan looked at the iron egg and exclaimed: "Exactly correct! The old man planned to order someone to help Xiao Langjun prepare paper and pen for calculations, but he didn't expect Xiao Lang to use mental arithmetic alone. I can get the result! Xiaolangjun is a great talent!"

Tie Dan smiled, and said, "Master Lin should ask the next question!"

Lin Wenyuan glanced at Tie Dan with admiration, and then continued: "Okay! Mr. Lang, please listen to the second question. Han Xin points out the number of soldiers in a team. There are more than two in a group of three and three in a group of five. There are four people in the group. Question: How many soldiers are there at least?"

This is a famous ancient math problem, borrowed from Han Xin's allusions, but I don't know how many people have been stumped through the ages.

Tie Dan's expression became serious after reciting the question twice in his heart.

This problem is to ask for a positive number, so that 3 divides the remainder 2, 5 divides the remainder 3, and 7 divides the remainder 4, and the number obtained is as small as possible.

However, there is a relatively stupid method, that is, experiment and analysis, by continuously substituting data, adding conditions step by step to infer the answer.

For example, we start with the condition that 3 is divided by 2. The number satisfying this condition is 3n2, where n is a non-negative integer.

To make 3n2 still meet the condition of dividing the remainder by 5 by 3, you can substitute 1, 2, 3, ... for n to try. When n=2, 3n2=8, 8 divided by 5 is exactly the remainder of 3. It can be seen that the number 8 satisfies the two conditions of dividing 3 by 2 and dividing 3 by 5.

The last condition is to divide the remainder by 7. 8 does not satisfy this condition. We need to get a number on the basis of 8, so that it meets three conditions at the same time.

By analogy, the correct answer will always be tried in the end!

But the disadvantage of this method is also obvious, that is, it is extremely time-consuming.

"Come here, help Han Xiaolang prepare pen, ink, paper and inkstone!"

Seeing Tie Dan's eyebrows constricted, Lin Wenyuan ordered his servants to get paper and pen.

Tie Dan said at this moment: "No, Master Lin, I have come to the correct answer!"

Lin Wenyuan finally couldn't sit still, he stood up and exclaimed: "What? You already have the answer?"

Standing with an iron egg on his hand and practicing Tai Chi for a few months, he has a tall and straight posture and an outstanding temperament. He is so different from the old boy who only played mud with his peers! At this moment, he was like a peerless master in the battlefield, his clothes fluttering, detached from the world.

"Yes! According to my calculation, there are at least fifty-three soldiers in this team. Master Lin, I wonder if I can answer them correctly?"

As everyone expected, the iron egg slowly said the answer.

Lin Wenyuan's breathing was a little short, and he couldn't say anything to him: "How is it possible? How can you calculate the answer in such a short time? Xiao Langjun, you can honestly tell me, have you solved this problem privately before?"

Tie Dan shook his head and said: "There was never before!"

"How is this possible?! Then, Mr. Lang, can you tell me your idea of ​​solving the problem with the old man?"

Tiedan did not refuse Lin Wenyuan's request. He organized the language and said: "The kid thought of a simple solution, I don't know whether it is right or wrong!

First, 3×5×7=105;

70 is a multiple of 5 and 7, and the remainder is 1 divided by 3;

21 is a multiple of 3 and 7, and the remainder is 1 divided by 5;

15 is a multiple of 3 and 5, and the remainder is 1 divided by 7;

Therefore, 70×2 is a multiple of 5 and 7, and the remainder is divided by 3;

21×3 is a multiple of 3 and 7, divide the remainder by 5 by 3;

15×4 is a multiple of 3 and 5. Divide the remainder by 7 to 4;

So 70×221×315×4=263=2×10553;

Therefore, 53 divided by 3 remains 2, 53 divided by 5 remains 3, 53 divided by 7 remains 4, so there are at least 53 soldiers in this team! "

"Really! Old Demon Han is awesome!"

Although Tiedan is not detailed, and although Lin Hao knows nothing about mathematics, it does not prevent him from cheering for Tiedan~www.readwn.com~ because Tiedan just talked and talked about it, he was really handsome. !

Lin Wenyuan did not reprimand his son again this time, because his mood at this time was not much calmer.

"Papa Papa~!"

Uncontrollably, Lin Wenyuan clapped his hands. He inherited his father’s business since he was a child. He has been in business since he was a child. He is most sensitive to figures and the like. He understands completely, but this does not prevent him from applauding for Tiedan's new way of solving problems.

Black cat and white cat, the one who catches the mouse is a good cat! Facts have proved that the iron egg method is faster and more accurate! that's enough!

"Brother Han is very talented, I admire it! Many people who have come to choose before have all turned to this second question. Unexpectedly, when Han Xiaoge came, he would not arrive for half an hour. Then he solved this question in a different way. . Since ancient times, the hero was born into a boy, and the old man is an eye-opener today!

There is no need for this third question, Brother Han, you have already passed the level! I don’t know if you want to be my son’s Mr. Xixi or not. The old man is willing to pay a monthly salary of 20, and you don’t need to come every day. Just follow the school calendar of Yanhuang Academy. You can come every time on vacation!

And to be honest, my son Lin Hao intends to take the entrance examination of Yanhuang Academy next year. As we all know, Yanhuang Academy focuses on arithmetic. If my son can be admitted to Yanhuang Academy under the guidance of Xiaoge Han, the old man is willing to give out two hundred guan. Thanks for it! I wonder if Brother Han is willing? "

Unconsciously, Lin Wenyuan's attitude towards Tiedan was quite respectful, only to see him bowing his hands to Tiedan with a sincere expression.

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