Otaku Engineer in Great Tang Dynasty Chapter 998: Old Demon Han is awesome!
"Oh? Xiao Lang Jun deserves to come from Yanhuang Academy. He actually got the answer so quickly, please tell me!"
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 don't know if it is 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:
"I rely on! Bull! Han Li! I answered so quickly! You deserve to be the legendary Old Demon Han! The strength is so high, the brain is so bright!"
(In "The Legend of Mortal Cultivation", because Han Li is cruel to the enemy, he is very vengeful, and he has a lot of ghosts. He is a completely unwilling to suffer a loss, so everyone unanimously calls him Han Old Demon)
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 and excitement on his face, and sat down honestly.
Mother Lin glanced at her son and smiled, and she secretly said that there is a drama in her heart. Maybe her son can pick up the interest in learning because of the iron egg!
Seeing that his own evildoer is honest, Lin Wenyuan looked at Tiedan and exclaimed: "Exactly right! 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 make a single You can get the result by mental arithmetic! Xiaolangjun is a great talent!"
Tiedan 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 two in a group of three and three in a group of five There are four people in a group of seven. Question: How many soldiers are there at least in this team?"
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.
After Tie Dan muttered the question twice in his heart, his face became serious.
This question is to ask for a positive number to divide the remainder by 3, divide the remainder by 5, divide the remainder by 5, and divide the remainder by 7, and hope that the number obtained is as small as possible.
There is a rather stupid method, that is, experiment and analysis, by constantly 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 3 and dividing 3 by 5.
The last condition is to divide by 7 the remainder 4. 8 does not meet 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!"
Lin Wenyuan saw Tie Dan's eyebrows staring silently, so he ordered his servants to get paper and pen.
At this moment, Tie Dan said: "No, Master Lin, I have got the correct answer!"
Lin Wenyuan finally couldn't sit still, he stood up and exclaimed: "What? You already have an answer?"
Standing with an iron egg with his hands behind him, he who has practiced Tai Chi for a few months is tall and straight and has an outstanding temperament. He is very different from the old boy who only played in the mud with his peers! At this moment, he was like a peerless master who was in the battlefield, his clothes fluttering and detached from the world.
"Yes! According to my calculation, there are at least 53 soldiers in this team, Master Lin, I wonder if I can answer correctly?"
Falling in the hope, the iron egg slowly said the answer.
Lin Wenyuan's breathing was a bit short, and he couldn't say anything to him: "How is it possible? How can you figure out the answer in such a short time? Xiao Langjun, tell me honestly, have you ever solved this problem in private before? ?"
Tiedan shook his head and said: "There was never before!"
"How is this possible?! So Xiaolangjun, can you tell me your idea of solving the problem with the old man?"
For Lin Wenyuan’s request, Tiedan did not refuse. He organized the language and said: "The kid thought of a simple solution, I don’t know whether it’s right or wrong!
First, 3×5×7=105;
70 is a multiple of 5 and 7, and 3 is divided by 1;
21 is a multiple of 3 and 7, and 5 is divided by 1;
15 is a multiple of 3 and 5, and 7 divides the remainder by 1;
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! "
"Rely on! Old Demon Han is awesome!"
Although Tiedan is not in detail, although Lin Hao knows nothing about mathematics, this does not prevent him from cheering for Tiedan~IndoMTL.com~Because Tiedan just talked and talked about it, he was really handsome. Up!
Lin Wenyuan did not reprimand his son again this time, because his mood was not calm at this time.
"Happiness~!"
Uncontrollably, Lin Wenyuan clapped his hands. He inherited his father’s business since he was a child. He was in business since he was a child. He is most sensitive to numbers and the like. He can’t be proficient in mathematics, but he only knows a little bit. Although he did not fully understand it, this did not prevent him from applauding for Tiedan's new way of solving problems.
Black cats and white cats, those who catch mice are good cats! Facts have proved that the iron egg method is faster and more accurate! that's enough!
"Brother Han is very talented, I admire it! There were many people who had come to choose before, and they were all on this second question. Unexpectedly, when Brother Han came, he would not arrive for half an hour. Then he solved it in a different way. This question. Since ancient times, when a hero was born into a boy, the old man is an eye-opener today!
There is no need for this third question, Brother Han, you have 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 here every time you leave!
And let’s not hide it, my son Lin Hao intends to take the entrance examination of Yanhuang Academy next year. As we all know, Yanhuang Academy pays attention to arithmetic. If my son can be admitted to Yanhuang Academy under the guidance of Xiaoge Han, the old man is willing to spend two hundred at a time. Come on, as a thank you! I wonder if Brother Han is willing? "
Unconsciously, Lin Wenyuan's attitude towards Tiedan was quite respectful, only to see him bowing his hand to Tiedan with a sincere expression.
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