60006000读作:____________________30507090读作:____________________80001600读作:____________________9004005读作:____________________
3:5==15÷ = ÷75= (填小数)
0.75= :28== %=24÷ .
18÷ = ÷25=0.6==.
=0.25==27÷ = ÷48.
12: == : = :12.