Math short story plus 100 words of impressions

Hua Luogeng was born in Jiangsu Province, and he has loved mathematics since he was a child, and he is very smart. In 1930, 19-year-old Hua Luo returned to Geng to study at Tsinghua University. Hua Luogeng studied hard under the guidance of Professor Xiong Qinglai in Tsinghua University for four years, published more than a dozen articles in a row, and was later sent to the United Kingdom to study and obtain a doctorate.

He had a deep study of number theory and came up with the famous Fahrenheit theorem.

The reporter asked him in an interview: "What is your greatest wish?" ”

His spirit of hard work and perseverance for science and the world is worth learning from. ”

Or Gauss's elementary school math teacher thought that there could be no genius in such a small mountain village, so he did not pay attention to education, and one day in class, he assigned the students a calculation problem, from 1 to 100, he thought that everyone would definitely take a long time to do it,。。

The story of physicist Rutherford, Newton's discovery of the gravitational pull of the earth, the killing of Archimedes, and the herding of sheep by Euler.

Pufeng test. One day, the French mathematician Pu Feng invited many friends to his home and did an experiment. Pu Feng laid out a large white paper on the table, and the white paper was full of parallel lines at equal distances, and he took out many small needles of equal length, and the length of the small needles was half the length of the parallel lines.

This number is an approximation of . An approximation of pi is obtained each time, and the more times you throw, the more accurate the approximation of pi will be. This is known as the "Pufeng Experiment".

Mathematical magician.

One summer day in 1981, a mental arithmetic competition was held in India. The performer is a 37-year-old woman from India whose name is Shaguntana. On that day, she had to compete with an advanced electronic computer with amazing mental arithmetic skills.

The staff writes a large number of 201 digits and asks you to find the 23rd root of the number. As a result, it took only 50 seconds for Shaguntana to report the correct answer to the audience. In order to arrive at the same number of answers, the computer has to input 20,000 instructions and then calculate them, which takes much more time than Shagontana.

This anecdote caused an international sensation, and Shagontana was called the "mathematical magician".

Make change. A customer came to a cane shop and bought a cane for 30 yuan, and he took out a 50 yuan ticket and asked for money. The store happened to have no change, so the shopkeeper went to the neighbor and exchanged the 50 yuan ticket for change, and gave the customer 20 yuan to find a head.

As soon as the customer left, the neighbor ran in a panic, saying that the 50 yuan ticket was fake The shopkeeper had no choice but to compensate the neighbor 50 yuan Then he went out to chase the customer, and caught him and said: "You **, I will pay the neighbor 50 yuan, and find you the first 20 yuan, you took away a cane, you have to compensate me for the loss of 100 yuan".

The customer said, "The cost of a walking stick is the 30 yuan you left when the neighbor gave you change, so I only took 70 yuan from you." I would like to add here that the cost of the cane is 20 yuan If the customer succeeds in defrauding, how much money does the total amount of money be defrauded?

The problem of trains going in the opposite direction.

Two trains travel in opposite directions along the same track, each traveling at 50 miles per hour. When the two cars were 100 miles apart, a fly flew at a speed of 60 miles per hour from train A to train B. As soon as it meets train B, it turns around and flies towards train A, and so on until the two trains collide and crush the fly.

How far did the fly fly before it was crushed?

We know that the two cars are 100 miles apart and each car is traveling at 50 miles per hour. This means that each vehicle travels 50 miles, which means that two vehicles collide after one hour. During the hour between the departure of the train and the time it collided, the fly had been flying at a speed of 60 miles per hour, so at the time of the collision of the two cars, the fly had traveled 60 miles.

The result is the same regardless of whether the fly flies in a straight line, in a "Z" line, or in a tumbling flight in the air.

I don't know, ah, who told me!! I'm in a hurry!! Whoever knows, speak quickly.

Good friend recently got a new waiter in the "math shop", and it was the little "4".

One day, Little "3" went to the math store and bought a pencil, and Little "4" said, "You should pay 1 yuan, 5 jiao and 4 cents." ”

After paying 1 yuan and 5 jiao, the little "3" asked: "How can I pay for 4 points?" "Little" 4 "hurriedly said:

You don't have to pay the 4 cents. "Little" 3 asked suspiciously: "Then aren't you going to suffer?"

No, this is a rule in our store called 'rounding'. Anything less than 4 cents is rounded off, and if it is 5 cents or more, then 1 dime is charged. Little 4 explained kindly.

Little "3" happily said, "Thank you, you are so nice!" ”

yes, I like it very much4 too. "25" ran over and said, "Because 25 4 = 100, it's easier to calculate, for example: 25 87 4 = 25 4 87, isn't it fast and easy to calculate?!" ”

Yes, it's fast and easy, and I like 4 too. It turned out to be "29". "25" hurriedly asked

Hey, why do you like '4' too? "29" said unhurriedly: "You don't know this, February in a normal year is 28 days, only the year when the Gregorian calendar year is a multiple of 4, February is 29 days, I only get my turn once in 4 years, of course I like '4'."

However, the Gregorian calendar year is a whole hundred, it must be a multiple of 400, and there are only 29 days in February, such a year is called a leap year. ”

Ah, what a use '4' can be! "25" exclaimed.

This "4" waiter is really a gentle and endearing waiter.