10 m equals 1000 cm, divided by 200 is 5 cm, and 2.3 times 30 is 69 m. Oula primary school was expelled because he asked too many questions and embarrassed the teacher. Some people say that Euler knew arithmetic before he spoke, and so did Gauss. Gauss can find the calculation error in his father's account book at the age of one, but it must be a legend. But Euler knew the isoperimetric principle from an early age: in all figures with fixed perimeters, the largest area must be a circle.

As follows:

The famous John Beye is a friend of Euler's father. The first time I met six-year-old Euler, I was puzzled by him: "I know a number 6, which has a factor of 1, 2, 3, 6, which adds up to twice that of 6;" There is also a number 28. The factor is 1, 2, 4, 7, 14, 28, which adds up to twice that of 28. How many such figures are there? " This kind of number is called perfect number or Euler number, and finally the expression of even perfect number is given, which is later.

In the case of odd numbers, whoever can correctly prove the existence or absence will surely win the highest prize in mathematics now. Euler 17 years old received a master's degree in university of basel. Euler was so absorbed in mathematics that he had to make it a rule not to read books while eating. /kloc-when he was 0/9 years old, he was invited by Queen Kadrina of Russia to study at the Academy of Sciences in Petersburg.

Euler solved too many problems, and the methods created in the process of solving problems created many branches of mathematics. Euler initiated topology by solving the famous seven-bridge problem, and Goldbach conjecture is famous for the communication between Goldbach and Euler.

Euler first proved that any positive integer can be written as the sum of no more than four squares, which has not been solved for nearly two thousand years. Number theory, geometry, mechanics and celestial mechanics leave Euler's footprints everywhere.