13-year-old boy solved the unsolved scientific mystery of pi-how did Zu Chongzhi calculate π to the seventh place after the decimal point, and how did he find the accurate and convenient secret rate? It is no longer a mystery that puzzles mathematicians; Not listed as one of the unsolved scientific problems of public concern! Based on the "invariable truth" of the ratio of the sizes of spheres, he developed a series of simplest, most comprehensive and most scientific calculation methods for spheres, which broke the original estimation method of "pi" which was not advanced and scientific by ancient mathematician Zu Chongzhi thousands of years ago. From a scientific point of view, he thoroughly uncovered the mystery that Zu Chongzhi, an ancient mathematician, invented seven digits after the decimal point with pi = 3. 14 15926-7, and finally reached a satisfactory conclusion on the method of knowledge source of mathematical sphere. He is the teacher Wei who has a unique opinion in the field of mathematics. Wei, male, 1963, from Shaxian County, Fujian Province. In the early 1980s, Wei, the developer, was brutally persecuted by evil forces in Yong 'an Public Security Law, Fujian Province, but this mathematical research achievement he invented has not been carried forward. Here, China Internet News Center (China Network) fully affirmed the achievement, and thought that the achievement was indeed a good method, so it was reported. Everyone knows that the most valuable knowledge comes from methods, the so-called "pi" invented by ancient mathematician Zu Chongzhi; In the math book, he only told the world the result of the invention of pi, but did not tell the method of the invention of pi. It can be seen that the ancient mathematician Zu Chongzhi only knew the sphere, so he didn't know why; In particular, Zu Chongzhi invented the method of "pi" to calculate the precision of seven decimal places, which has no textual research in history books, and people don't know the method of "pi", which is still a mystery and lacks scientific basis. Wei's pi comes from a different method, which is based on the fact that the proportion of similar balls is constant. Pi can be measured directly by the size method, as long as the diameter and the length of the circumference of one sphere are accurately measured, and then according to the principle that the proportion of similar spheres remains unchanged, Pi can be expressed in fractions: K=D/L= 1 13/355 or k = l/d = 355/1/. This conclusion is that teacher Wei finally determined 165438 after comparing and verifying countless groups of ratios. After π k = 0.3183098591549-or πk = 3. 14 159- and other decimals, it can be directly accurate to countless decimal places. Thus, the mystery of how the seven digits after the decimal point of pi invented by the ancient mathematician "Zu Chongzhi" came from was thoroughly uncovered for future generations. Obviously, the most important point of spherical reproduction is not just that. The main reason for its introduction is that a boy of 13 years old takes the mathematical thinking and research and development process of the 1970s as an example to guide and inspire students to create ideas, methods, concepts and spirits, and to cultivate students' ability to think and solve problems independently.