在横线里填“>、<或=”.0.2 0.3 0.3 0.03 0.12 0.21.
=== ÷ = (小数)
=21÷ = %== (填小数)
( )÷20===15:( )=( )%
=== ÷ .
= ÷5=0.8=4: = %= 折.