Speaking of Han Xin, everyone must be familiar with it, from the powerful assassin in the glory of the king to the various allusions in history, you can often see his figure.
For example, the crotch humiliation that we are very familiar with is about when Han Xin was not yet famous, once Han Xin and a group of street gangsters clashed, and the other party saw Han Xin holding a sword in his hand, and he couldn't help but laugh at him: "People like you are also worthy of using swords, if you really have a kind, use this sword to kill me, or crawl over my crotch like a dog, I will spare you."
If Han Xin really used his heart and sword, his future might be completely ruined. But he was able to endure a moment of humiliation, really chose to crawl from the crotch of the other party, and what was even more admirable was that many years later, Han Xin became a great general, and he actually found the person who insulted him at that time, and also made him his own captain, this kind of courage is definitely not something that ordinary people can have.
From the real history, Han Xin's military ability is nothing to say, the humble Liu Bang was able to defeat the Western Chu overlord Xiang Yu with a weak victory over the strong, it can be said that Han Xin's credit is no one can replace, Han Xin is also because of repeated perfect battlefield performance, by later people called "soldier immortals". But in fact, in addition, Han Xin has also shown a very special advantage in mathematical wisdom, he has left two mathematical problems in his life, even if we look at it again today, we have to give a thumbs up.
The first is what we often call "Han Xin DianBing". Speaking of this word, we may think of the story between him and Liu Bang, but in fact, what we are going to talk about today is the mathematical wisdom embodied in his battle. At that time, during the critical period of the Chu-Han conflict, there was an encounter between Han Xin and Long He's troops, and after a fierce battle between the two sides, Xiang Yu's reinforcements came, and Han Xin wanted to know how many people were left in his troops, but at that time, if he reported the number according to the routine, it was simply too late.
At such a critical moment on the battlefield, Han Xin quickly issued an order, first let all the soldiers be in a row of three people, the result was two people, and then let the soldiers be in a row of five people, found the remaining four people, and finally let everyone in a row of seven people, the result was that there were six more people, after these three arrangements and combinations, Han Xin quickly came to the conclusion: Our army still has a thousand men and horses, and the local reinforcements are only more than five hundred people, and if they do not retreat, they will be able to defeat the other side. When the soldiers heard the news, their confidence soared, and in the end Han Xin also won the battle.
In fact, regardless of whether the calculation results are accurate or not, Han Xin's ability to make quick decisions is very worthy of our learning, even if the actual number is not so much, but his means can quickly enhance the confidence of soldiers, perhaps it will become a turning point in a battle.
And another mathematical problem, is Han Xin oil thing, this story is, once, Han Xin walking on the road, saw two old people quarreled fiercely, close to understand after finding out, two old people went to the market to fill ten pounds of oil, but now they only have a jar that can hold seven pounds and a gourd that can hold three pounds, and they want to divide ten pounds of oil equally, each person divides five pounds, but because they do not have a scale, they have not known what to do.
When Han Xin listened, he left only one sentence: "The gourd returns to the jar and the basket." After listening to the two old men, they felt confused, did not know why they said so, but there was no better way, so they simply tried it, and sure enough, they achieved equal division, and even clapped their hands and praised Han Xin.
Nowadays, the development of mathematics has become more and more perfect, we may be exposed to a variety of magical mathematical formulas at a young age, although many of them are from the West, but in fact, China's ancestors have long made a lot of contributions to mathematics, and they are particularly clever. So, Han Xin's two problems, do you know how he cracked them?