The wonderful mathematical content is that the two-color ball consists of 33 red balls and 16 blue balls, and each lottery is basically maintained at 6 red balls and 1 blue balls, so the winning rate of the first prize of the two-color ball is117720000. Which means there's a one in a million chance. Although the probability is very low, there are many people buying lottery tickets because of the large population base in China, so in theory, someone can win the first prize.

This takes advantage of the fact that the diameters in the same circle are all equal. Only the circular manhole cover can't find the diagonal, so no matter how the manhole cover moves, the cover won't fall off, and the workers working below will be safe! If it is designed as a triangle or a square, although the cover is larger than the manhole, it may still fall down.

Interesting math story

0.6 18 was discovered by Pythagoras, a famous mathematician in ancient Greece, more than 2500 years ago. Once, Pythagoras passed by the blacksmith's workshop and was fascinated by the tinkling of iron. In order to uncover the secrets hidden in this crisp and pleasant voice. ?

Pythagoras measured the dimensions of hammer and anvil and found that there was a very harmonious proportional relationship between them. When he got home, he took out another thread and divided it into two sections. After repeated comparisons, he finally decided that the ratio of 1:0.6 18 was the most beautiful. Up to now, this figure is still regarded as the golden rule of science and aesthetics by later generations. ?

At the concert, the best position of the announcer on the stage is 0.618 of the stage width; In order to obtain the best timbre of erhu, its weight should be placed at 0. 18 of the chord length.