/kloc-Rudolph, a German mathematician in the 6th century, spent his whole life calculating pi to 35 decimal places, which was later called Rudolph number. After his death, someone else carved this number on his tombstone. Jacques Bernoulli, a Swiss mathematician, studied the spiral (known as the thread of life) before his death. After his death, a logarithmic spiral was carved on the tombstone, and the inscription also read: "Although I have changed, I am the same as before." This is a pun, which not only describes the essence of spiral, but also symbolizes his love for mathematics.
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How did the symbols+,-,× and = come from?
The five symbols+,-,×, = are familiar to everyone, but do you know their origins? In ancient times, both ancient Greeks and Indians wrote two numbers together to indicate addition and two numbers separately to indicate subtraction. In the late Middle Ages, European commerce gradually developed. Some merchants often draw "+"on the boxes, indicating more weight; Draw a "-"to indicate that the weight is slightly insufficient. During the Renaissance, the Italian artist Leonardo da Vinci also used the symbols "+"and "-"in some of his works. In A.D. 1489, Widman, a German, officially used these two symbols to indicate addition and subtraction in his works. Later, after the vigorous propaganda and advocacy of the French mathematician Veda, these two symbols began to popularize and finally got everyone's approval in 1603. The symbols × and \u \u have only been used for more than 300 years. It is said that William Outlander, an Englishman, used "×" for the first time in his book 163 1 year, and this method is still used by later generations.
In the Middle Ages, Arabic mathematics was quite developed, and the great mathematician Al Walazimi once used "3/4" to indicate that 3 is divided by 4. Many people think that this is the origin of common marks of scores. It was not until1630 that the number ⊙ appeared in the works of john beal, an Englishman. Presumably, it is a combination of Arabic division symbol \u and comparison symbol \ u. At present, in most countries' publications,+and-are used to represent addition and subtraction. X and÷÷are not used much. In some countries, ""is used to replace "X" in textbooks, while ":"is generally used to replace "∫" in Russian and German publications. So how did the symbol = come into being? Babylonia and Egypt used various symbols to express equality, but the modern = symbol was first used in the Middle Ages, in Reckord's masterpiece The Grindstone of Wisdom. He said that he chose two parallel lines of equal length as the equal sign because they could not be more equal. However, the = symbol did not become popular until18th century.
It will take at least a few minutes.
Grandpa Hua is a famous mathematician in China. He was born in a poor family. He loves learning very much. He always studies against the clock. He always tries to solve problems by himself.
At 1965, Grandpa Hua wrote a topic in one of his books. The purpose of Grandpa Hua's question is to train children to arrange their time reasonably when doing several things. The topics are as follows: it takes 1 minute to wash the kettle, 1 minute to boil the water,1minute to wash the teacup and 2 minutes to make tea. How many minutes does it take to make tea? Students, how to arrange these things reasonably in order to save time? It is necessary to be able to do several things at the same time. First, wash the kettle, then boil the water. After the water is boiled, it takes 15 minutes for the water to boil. 15 minutes, you can wash cups, take tea leaves, and make tea after the water is boiled, so it only takes 16 minutes. Students, when you want to do a few things, can you arrange them according to the way grandpa Hua taught us? Think about it:
What inspiration will this story give us?