妈妈给小云买了一辆童车,很漂亮,也很实用。可是,小云观察到,这辆童车的前后轮好像不一样大。她量量前轮,直径是27厘米,再量量后轮,直径是36厘米。她想到,当前轮转动40圈时,后轮转了多少圈呢?面对自己提出的问题,小云认真思考起来。她想,两个轮子不管大小,在同一时间内转动的长度都是相等的。由于两个轮子的直径不相同,所以它们所转的转数不相等,直径小的轮子转得快,直径大的轮子 Mom bought a baby car to Xiaoyun, very beautiful, very practical. However, Xiaoyun observed that the stroller’s front and rear wheels do not seem to be the same size. She measured the front wheel, the diameter is 27 cm, and then the amount of rear wheels, the diameter is 36 cm. She thought, the current round of rotation 40 laps, how many laps turn the ring? Faced with their own questions, Xiaoyun serious reflection. She thought that the two wheels, regardless of size, had the same length of rotation at the same time. Due to the different diameters of the two wheels, the number of revolutions they turn is not the same, the wheel with the smaller diameter turns faster and the wheel with the larger diameter