"Oh? Xiao Langjun is worthy of being from Yanhuang Academy, and he actually came up with 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 calculated a correct answer, it's twenty-three, I don't know if it's right or not?" ”

Lin Hao saw that Tie Dan was about the same age as him, but such a complex math problem could be calculated so quickly without pen and paper, so he couldn't help but pat the table and said excitedly:

"Holy! Cow! Han Li! Answered so quickly! It is worthy of the legendary Han Lao Mo! The strength is so hanging, and the brain is so bright! ”

(In "The Legend of Mortal Immortal Cultivators", because Han Li is ruthless to the enemy, very vindictive, and scheming, he is a master who is completely unwilling to suffer, so everyone unanimously calls him Han Lao Mo)

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

"Uh...... Yes, Daddy! ”

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

Mother Lin glanced at her son, smiled, and secretly said in her heart that there is a drama now, and her son may be able to pick up his interest in learning because of the iron egg!

Seeing that his son was honest, Lin Wenyuan looked at Tie Dan and exclaimed: "Completely correct!" The old man also planned to order someone to help Xiao Langjun prepare paper and pen for calculation, but he didn't expect Xiao Langjun to get the result by mental arithmetic alone! Xiao Langjun is talented! ”

Tie Dan smiled and said, "Master Lin, let's come up with the next question!" ”

Lin Wenyuan glanced at Tie Dan appreciatively, and then continued: "Okay! Xiao Langjun, please listen to the second question, Han Xindian The number of soldiers in a team is more than two in a group of three, three in a group of five, and four in a group of seven. Q: How many soldiers are there in this group at least? ”

This is a famous ancient math problem, borrowing the allusion of Han Xin's soldiers, but I don't know how many people have been stumped throughout the ages.

After Tie Dan silently recited the question twice in his heart, his face became solemn.

The problem is to ask for a positive number divided by 3 by 2, 5 by 3, 7 by 4, and the number as small as possible.

There is a dumber method, which is to experiment and analyze, and by constantly substituting data, step by step to increase the conditions to derive answers.

For example, let's start with the condition of dividing 3 by 2. The number that satisfies this condition is 3n+2, where n is a non-negative integer.

In order for 3n+2 to satisfy the condition of dividing 5 by 3, n can be divided by 1, 2, and 3 respectively,... Try it in. When n=2, 3n+2=8, 8 divided by 5 is exactly 3, so it can be seen that the number 8 satisfies both the two conditions of dividing 3 by 2 and dividing 5 by 3.

The last condition is to divide 7 by 4. 8 does not meet this condition. We want to get a number based on 8 so that it satisfies all three conditions at the same time.

And so on, and in the end, you will always try to get the right answer!

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

"Come on, help Han Xiaolangjun prepare pen, ink, paper, and inkstone!"

Lin Wenyuan saw that Tie Dan was silent, so he ordered his subordinates to get a pen and paper.

Tie Dan said loudly at this moment: "No need, Master Lin, I have come up with the correct answer!" ”

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

Tie Dan stood with his hands in his hands, he had practiced Tai Chi for a few months, his posture was upright, his temperament was outstanding, and he was very different from the hairy boy who could only play with his peers in the mud before! At this moment, he is like a peerless master who has come to the battle array, his clothes are fluttering, and he is detached from the world.

"Not bad! According to my calculations, there are at least fifty-three soldiers in this team, Master Lin, I don't know if I can answer correctly? ”

In the midst of all expectations, Tie Dan slowly said the answer.

Lin Wenyuan's breathing was a little short, and he said in disbelief: "How is it possible?" How could you possibly figure out the answer in such a short time? Xiao Langjun, you honestly told the old man, did you solve this problem in private before? ”

Tie Dan shook his head and said, "Not yet!" ”

"How is this possible?! Then Xiao Langjun, can you tell the old man about your solution ideas? ”

For Lin Wenyuan's request, Tie Dan did not refuse, he organized the language and said: "The kid thought of a simple solution, I don't know if it's right or not!"

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 is divided by 1;

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

21×3 is a multiple of 3 and 7, dividing 5 by 3;

15×4 is a multiple of 3 and 5, divide 7 by 4;

So 70×2+21×3+15×4=263=2×105+53;

Thus, 53 divided by 3 is more than 2, 53 is divided by 5 more than 3, 53 is divided by 7 and 4, so there are at least 53 soldiers in this group! ”

"Damn,! Old Devil Han is awesome! ”

Although Tie Dan didn't talk in detail, although Lin Hao didn't know anything about arithmetic, it didn't prevent him from cheering for Tie Dan, because Tie Dan had just talked eloquently, and he looked like he was really handsome!

Lin Wenyuan didn't reprimand his son again this time, because his mood at this time was not calm.

"Bang Bang Bang~!"

Lin Wenyuan couldn't help but applaud, he inherited his father's business since he was a child, he has been in business since he was a child, and he is the most sensitive to numbers and the like, and he is not proficient in arithmetic, but he also understands a little bit about it.

Black cats, white cats, the one who catches a mouse is a good cat! It turns out that Tiedan's method is faster and more accurate in solving problems! That's enough!

"Brother Han is talented, old and admirable! There were many people who came to apply for the election before, and they all folded on this second question, but I didn't expect that when Han Xiaoge came, it would not be half an hour. Then he solved this problem in a different way. Since ancient times, heroes have come out of youth, and the old man has opened his eyes today!

You don't need to come up with this third question, Brother Han, you've already passed the test! I don't know if you want to be my son's Mr. Xixi, the old man is willing to pay 20 times a month, and you don't need to come every day, just according to the school calendar of Yanhuang Academy, you can take time to come every time you have a holiday!

And to tell the truth, my son Lin Hao plans to participate in 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 teaching of Brother Han, the old man is willing to take out two hundred yuan at one time as a thanks! I wonder if Brother Han is willing? ”

Unconsciously, Lin Wenyuan's attitude towards Tie Dan was a lot more respectful, and he said to Tie Dan with a sincere face.

……………………………………

First update!

(End of chapter)