Junior high school math story 1
One night in the Northern Song Dynasty, the owner of a small hotel was making jars with his buddies. Because business has been particularly good recently, there are naturally many jars. The boss is happy and thinking about how to make more money. He wants to stack the cans neatly and beautifully to attract more customers to the hotel.
The jars are piled beautifully, layer by layer neatly. The wave in front of the hotel fluttered with the wind, making people stop and want to have a few drinks in the store. When the hotel owner is in high spirits, he wants to count how many jars there are. However, it is not easy to count cans. The boss went from front to back, and then from back to front. The freshly dried sweat came out again, and the guys all laughed.
The next day. This pile of jars really attracted many customers, and the boss was overjoyed when he looked at the jars. At this time, a well-dressed young scholar came over and faced the jars thoughtfully. The boss thought, I spent a lot of time counting this pile of cans yesterday. This young man is extraordinary in appearance, and I will test him.
"Young man, do you know how many cans there are in this pile?" The boss asked half jokingly.
"Is very simple, as long as you tell me the top layer of this pile of jars is a few rows, each row has several, a * * *, several layers. I don't need to count. I know the number of cans in this pile at once. " Young people obviously have answers when they talk like this.
"Oh!" The boss thought, this young man really talks big. Let's tell him his conditions and see what he can do. So the boss said brightly:
"There are four rows of jars on the top floor, eight in each row, and five rows of jars on the second floor, nine in each row ..."
"Well, it's the seventh floor of * * *," the young man interrupted the boss and gave the answer without thinking. "A jar of ***567. Right? "
The boss was so surprised that he forgot to shut his open mouth. So soon! The boss immediately invited the young people into the hotel, served tea and toasted them, and treated them well. The boss really admired the young man, asked his name and asked how to count the altars.
The young man's name is Shen Kuo. Superior family life conditions gave him the opportunity to study, and he was curious and willing to study, so he became a very talented person. Shen Kuo replied to the boss: "My method of counting jars is actually very simple, because there are 77 * * * and 7 * * layers in the middle, multiply by 7 and add the constant 28 at last."
Shen Kuo was interested in calculation since he was a child, and read many famous mathematical books. Later, I wrote a mathematical monograph, Gap Product, which was devoted to the summation of higher-order arithmetic progression. Shen Kuo's method of counting altars is the summation of higher-order arithmetic progression, which is much more convenient than simple counting. In mathematics, you may encounter problems with large numbers and items, which can be solved at one time by this method.
Junior high school mathematics short story II
Once upon a time, there was an old man. On his deathbed, his three sons gathered at the bedside.
He said to his sons, "I have prepared seventeen horses for you, and I will give them to three people." When the horse was divided, the boss contributed the most, with half of it; The second child, one third; The third is the youngest, so you can take one ninth of the total. "
After barely saying these words, the old man died. When the three brothers executed their wills, they agreed that these horses were their father's favorite things before his death, and they must never divide any of them into several pieces. But the will must be completely obeyed. What should we do?
As it happens, their old uncle came on horseback. After listening to the story, he raised his eyebrows and said, "I'll share it."
Guess, how did the old uncle divide the horse?
Because everyone wants an integer horse, according to the will, when dividing horses, the number of horses should be the common multiple of three denominators. The least common multiple of denominators 2, 3 and 9 is 18, so the total number of horses separated by horses should be a multiple of 18. The old man left his sons 17 horses, and the old uncle temporarily borrowed a horse he brought to make up the number. * * * There are 18 horses participating in the distribution.
Ready, the old uncle began to read and execute the will:
"... when dividing horses, the boss contributed the most, accounting for half ..." After reading this, the old uncle counted nine horses and asked the boss to take them:
Second, one-third of the total ... "After reading this, the old uncle counted six horses and let the second one lead him:
"The third is the smallest. You, take one-ninth of the total. " After reading the last sentence, the old man counted two horses and let the third horse lead him:
The sum of the horses divided by the three younger generations happened to be left by the father 17 horses;
9+6+2= 17。
There are 18 horses in the racecourse, and now there is only one left. Of course, my uncle borrowed it temporarily, and now it is still returned to its owner.
Junior high school mathematics short story 3
In ancient times, there was a rich man who hired a tutor to teach his children. The child is very naughty and often plays practical jokes for fun.
One day, teachers and students went to play in the wild. They saw a pair of worn-out cloth shoes under a big tree. Then, across the grass, they saw an old woodcutter sitting by the river washing his feet.
"Oh, this pair of cloth shoes is his. Teacher, I want to pick up some small pointed stones and put them in his toe. It must be interesting to see him uncomfortable wearing shoes in the future! "
The teacher said, "If you do this, you will only get temporary happiness, but I'm afraid you won't get long-term happiness." . Besides, the old man must be in pain. You build your temporary happiness on the suffering of others.
Let me ask you, will you laugh? "
The child seems to realize something, flashing bright eyes and asking, "Teacher, I hope I can get long-term happiness, but what should I do?"
The teacher thought for a moment and said, "There is a way. You might as well try putting a gold coin in his shoe. "
Sure enough, the child took out a gold coin and put it in the cloth shoes. Then the teacher and students hid behind the tree, waiting for the result of the joke.
After a while, the old man washed his feet and put on his shoes on the green grass. Hardly had he put one foot in his shoe when he met something hard. The old man got a fright, picked up his shoes with trepidation and poured them out. Poof, a gold coin fell out. The old man stared at the shiny gold coins in the grass, and his muscles twitched, Gherardini, and he wanted to cry. The child smiled happily when he looked at him; Fortunately, the teacher covered his mouth with his hand and didn't make him laugh.
At this time, the old man took the gold coin in his hand trembling, looked at it carefully and touched it. Then he held it in his hand and held it high above his head. At the same time, he knelt down and thanked God for having eyes.
From the old man's mumbling words, the child learned that his wife was ill, and there was only one lonely grandson at home. The family had not eaten for several days. He was so grateful that he kept saying, "God, I alleviated the disaster."
The old man burst into tears and the child sobbed. The teacher wiped her eyes with a cuff.
"Son, don't cry." The teacher advised.
"No, sir," the child looked up at the teacher. "This is my first real taste of happiness. It turns out that if you make people happy, you will be doubly happy. "
The teacher nodded and the teachers and students left silently.
At home, the child immediately found paper and ink and painted the scene vividly. He hung the picture in front of the book case, and every time he saw it, he always felt an indescribable sense of happiness.
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