从装有3个白球,2个黑球的口袋中任意摸出两球,全是白球的概率是 .
2: == ÷6== %
6: ==3:2=18÷ = :10.
:8==0.375= %.
6÷ == :12= %= (小数)
÷24=0.3750==24: = %.