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Give me three math stories.
1. When Gauss was ten years old, the primary school teacher gave an arithmetic problem: "Calculate 1+2+3 …+ 100 =?" . This is difficult for beginners of arithmetic, but Gauss solved the answer in a few seconds. He used the symmetry of arithmetic progression (arithmetic progression) and then put the numbers together like a general arithmetic progression sum: 1+ 100, 2+99, 3+98, ... 49+52.

When Hua was in junior high school, his homework was not good at one time, and sometimes he failed the math exam. Hua's math teacher, a famous educator and translator in China (1900 was born in Jintan), was teaching in Jintan Middle School at that time. He found Hua playful, but quick-thinking, and his math exercises were often changed, and his method of solving problems was very unique and original. On one occasion, the teacher of Jintan Middle School lamented that there were many "poor students" and no "talents" in the school. Wang Weike said, "Not necessarily. In my opinion, China is one! " "Hua Luogeng?" A teacher smiled and said, "Look at him, this word is like a crab crawling. Can he become a' talent'? " Wang Weike said with some excitement, "Of course, he has little hope of becoming a great calligrapher, but how can you see his talent in mathematics from between his lines?" You know, gold is buried in sand and looks no different from sand. What we need most as teachers' eyes is the ability to find gold in the sand, otherwise we will bury talents! "

3. When Su was 9 years old, his father took a load of rice as tuition, walked 50 kilometers of mountain roads and sent Su to Pingyang County, becoming a high school placement student. From the mountainous area to the county seat, Sue is really an eye-opener, and everything is novel. When he first saw the minced meat in the steamed bread, he often changed his meal ticket into money to buy "meat steamed bread" to eat. A month's meal ticket has been used up long ago, so I have to go hungry. When he saw the tiger stove boiling water, he felt very interesting. He threw the eggs he brought from home into the pot, and a pot of boiling water turned into a pot of egg drop soup. The boiler man was so angry that he grabbed him and hit him