把1块月饼平均分成5份,每份是这块月饼的.
0.4= : == %= ÷30.
3:5==15÷ = ÷75= (填小数)
0.75= :28== %=24÷ .
18÷ = ÷25=0.6==.
=0.25==27÷ = ÷48.