写出下面中的“2”表示的意思:20.04 ;3.20 ;6.02 .
5: ==1.25=30÷ = %
1==3÷ = : = %= (填小数).
=2: =4÷ = %=0.4.
÷ =20: ==0.8= %= 折.
0.25=12÷ == %= 成 .