把一批化肥按1:2:4分给甲、乙、丙三个村,乙村分到6吨,甲村分到这批化肥的,这批化肥共有 吨.
13:2= ÷ = :4=39: .
12: =0.6==6÷ = %
÷20=6: == %= 成=0.15.
:16==24÷ = %
9÷ = :48=0.75= %= 折数.