口袋里有3个红球和2个白球,一次摸到白球的可能性是. .
4: == ÷10= %
36÷ ==0.4=4: = %
:20==80%=20÷ = (填小数)
==12÷ = (填小数)
=0.75=( )÷8( )%=24:( )