70厘米=0.7米5275.2÷(0.7×3.14×120)=20分钟
5275.2/(3.14*0.7*120)=20分钟
5275.2/0.7/3.14/120=20
先梁猛算轮胎周长S1S1=2*0.35兀每分钟走的路程S2=S1*120需亮明要橡键桥时间T=5275.2/S2
5275.2/(0.7*3.14*120)=20分钟
5275.2*100/3.14*70*120=