一台拖拉机,后轮直径是前轮直径的2倍,后轮滚动40圈,前轮滚动()

问题描述:

一台拖拉机,后轮直径是前轮直径的2倍,后轮滚动40圈,前轮滚动()

40*2=80
一台拖拉机,后轮直径是前轮直径的2倍,后轮滚动40圈,前轮滚动(80圈)