One day, at the University of G? ttingen in Germany, a young man of 19 years old finished his dinner and began to do the math problems assigned to him by his tutor. Under normal circumstances, he always finishes this special homework in two hours. As usual, the first two topics were successfully completed in two hours. The third question, written on a small piece of paper, is to make a positive 17 polygon with only compasses and an uncalibrated ruler. He didn't care and buried himself in it. However, when doing this, he felt more and more difficult. Difficulties aroused his fighting spirit: I must do it! At dawn, he finally solved the problem. The tutor was stunned after reading the homework. He said to the young man in a trembling voice, "did you really do this yourself?" Do you know that you have solved a math unsolved case with a history of more than two thousand years? Akemi and Newton didn't solve it, but you solved it in one night! I have been studying this difficult problem recently, and I accidentally put a small note with this topic in the topic for you yesterday. " Many years later, when the young man recalled this scene, he always said, "If someone told me that this is a math problem with a history of more than 2,000 years, I could not solve it for one night." This young man is Gauss, the prince of mathematics.

Gauss is the son of an ordinary couple. His mother is the daughter of a poor stonemason. Clever as she is, she has no education and is almost illiterate. Before becoming Gauss's father's second wife, she was a maid. His father used to be a gardener, a foreman, an assistant to a businessman and an appraiser of a small insurance company. It has become an anecdote that Gauss was able to correct his father's debt account when he was three years old. He once said that he learned to calculate on Macon's pile of things. Being able to perform complex calculations in his mind is a gift from God for his life.

Gauss worked out the tasks assigned by primary school teachers in a short time: the sum of natural numbers from 1 to 100. The method he used was: sum 50 pairs of sequences constructed as sum101(1+100, 2+99, 3+98 ...) and get the result: 5050. This year, Gauss was 9 years old.