Cao Cao's people have never seen an elephant. The elephant is tall and big, and its legs are as thick as the pillars of the hall. When people get closer, they can't reach its stomach. Cao Cao said to everyone, "This elephant is really big, but how much does it weigh?" Can any of you weigh it? "ah! How can you call such a big guy? Ministers are talking about it.
One said, "just build a top scale."
The other said, "What a big scale this will be! Besides, elephants are alive and there is no way to weigh them! I think we must kill it, cut it into pieces and weigh it. "
Hardly had he finished speaking when everyone burst out laughing. Someone said, "You can't do this. Isn't it a pity to kill an elephant alive in order to weigh it? "
Ministers tried many methods, but none of them worked. It's really embarrassing.
Then a child came out of the crowd and said to Cao Cao, "Father, I have a way to call an elephant."
Seeing that Cao Chong was his favorite son, Cao Cao smiled and said, "What can you do at a young age? Tell it to me and see if it makes sense. "
Cao Chong prone on cao cao ear, spoke softly. Hearing this, Cao Cao cheered again and again, ordered the left and right sides to prepare elephants at once, and then said to his ministers, "Go! Let's go to the river to see elephants! "
Ministers followed Cao Cao to the river. There was a big boat parked in the river, and Cao Chong had an elephant brought on board. When the ship was stabilized, a road was carved on the horizontal plane of the ship's side. Then let people take the elephant to the shore, put the stones, big and small, on the boat one by one, and the boat will sink bit by bit. When the hull sank to the same height as the water, Cao Chong told people to stop loading stones.
The ministers opened their eyes wide, but at first they didn't understand what was going on. When they saw this, they couldn't help exclaiming, "Good idea! Good idea! " Now, as we all know, just weigh all the stones on the boat and add up the weights, and you will know how heavy the elephant is.
Cao Cao was naturally happier. He squinted at his son and looked at the ministers proudly, as if to himself: "You are not as clever as my little son!" " "
Extended data:
Cao Chongsheng is only five or six years old, and he has the wisdom of an adult. Sun Quan once gave birth to a giant elephant, and Mao wanted to know its weight, so salt was unreasonable among the people he visited. Chong said, "Put it on a big ship and carve its water mark. Call it, and the school will know." Mao Yue said that it is how to implement it.
According to experts' field research, Cao Chong's elephant is located in Xigang Village, Linzhang County, Handan City, Hebei Province.
This article aims at praising Cao Chong's extraordinary wisdom when he was young. Age is not the size, the key is to be good at observing and thinking, and children can do great things.
"Cao Chong is an elephant" is a story almost known to women and children in China. Cao Chong, who is only six years old, solved a difficult problem by using the physical principle that the gravity of an object floating on the water is equal to the buoyancy of water on the object.
This is a miracle, and even many learned adults are at a loss. However, at that time (AD 200), although Archimedes principle had been discovered for 500 years, it was not until 1627 that this principle was introduced to China. It is impossible for George W. Cao Chong to know this truth, let alone the conditions of ups and downs.
In fact, the clever Cao Chong used the method of "equal replacement". Replace the elephant with many stones, mark the boat, make the elephant and the stone have the same effect, weigh the stones repeatedly, turn "big" into "small", divide and conquer, and this problem will be solved satisfactorily.
Equivalent substitution method is a common scientific thinking method. Here is a short story about Edison. The great American inventor Edison had an assistant named Aptom, who had a good foundation in mathematics. Once, Edison gave Aptom the glass shell of a light bulb and asked him to calculate the volume of the light bulb.
Aptom looked at the pear-shaped bulb shell, thought for a long time, drew the sectional view and perspective view of the bulb shell, drew a series of complicated curves, measured the data one by one, and listed a series of formulas.
After several hours of intense calculation, the result hasn't come out yet. Edison was very dissatisfied after reading it. I saw Edison fill the bulb shell with water and then pour the water into the measuring cup. In less than a minute, he calculated the volume of the light bulb. Here, Edison replaced the volume of the bulb shell with the volume of water poured into the measuring cup, and also used the equivalent replacement method.
From the Three Kingdoms: Chong Shaocong Tea, born at the age of five or six, has the wisdom of an adult. At that time, Sun Quan once gave birth to a giant elephant, and Mao wanted to know its weight. It is impossible to be reasonable under the group he visited. Chong said, "Put it on a big ship, carve its water mark, weigh it, transport it, and you will know." Great joy, that is, how to implement it.
Brief introduction of the author
Chen Shou (233-297) was born in Han An, Brazil (now Nanchong, Sichuan). Historians of the Western Jin Dynasty. When I was a child, I was eager to learn and studied under Qiao Zhou, a scholar in the same county. He is in charge of general Wei, the secretariat of Dongguan, the history of Guan Ge, and the assistant minister of Huangmen. At that time, eunuch Huang Hao was authoritarian, and his ministers followed suit.
Chen Shou was repeatedly dismissed because he refused to give in to Huang Hao. After entering Jin, he served as a writer, Changping magistrate, scholar and suggestion. In 280, the gold was destroyed, ending the separatist situation. Chen shou was forty-eight years old and began to write the reflection.
References:
Baidu Encyclopedia-Cao Chong said elephants