One, year, month and day knowledge
In the Gregorian calendar, a year is designated as 365 days (average year), so that one day is lost almost every four years. If you add this day to February, there will be 366 days (leap year) in this year. In ancient China, it was known that there were 365 days in a year. A year is 12 months. In a month, the big month has 3 1 day, the abortion has 30 days, the leap year has 29 days in February, and the normal year has 28 days in February. On average, there are 365 days in the whole year and 366 days in leap years.
A year is the time for the earth to revolve around the sun once. A month is the time when the moon goes around the earth. One week, that is, the full moon. A day is like the time when the earth rotates once, that is, one day plus one night, which is 24 hours in total.
Second, mathematical stories.
When Gauss was at the University of G? ttingen, he was late for something once, and almost all the classes were over when he got to the classroom. Gauss walked into the classroom and found that the teacher was not there. He wrote several questions on the blackboard. Gauss thought these questions were today's homework, so he wrote them down. That night, he spent the whole night studying these math problems. Unexpectedly, these problems are extremely difficult.
Gauss didn't solve a problem until dawn. The next day, he found the teacher in frustration and told him all about it. His teacher was shocked: "These are the most famous problems in the history of mathematics, and you actually solved one in one night?" The problem solved by Gauss is the problem of drawing a regular heptagon ruler that has puzzled mathematicians for two thousand years. That year, Gauss was only 19 years old.
Third, mathematical riddles.
1, two cows fight (mathematical term)-diagonal.
2, 30 points (mathematical terms)-triangle.
3, goodbye, mom (mathematical noun)-denominator.
4. Similarity (mathematical term)-approximation.
5.1000×10 =10000 (idiom)-thousand.