汽车车轮的半径是0.3米,它滚动1圈前进多少米?滚动1000圈前进多少米?
27÷ == :40= %= 折= (小数)
2:3=2÷3. .
填表
4.9:6.3= :9== ÷72≈ %
= 5== ÷ .