A×48+A×52= ×( + ).125×(73×8)=73×( × )
甲数和乙数的比是2:3,则甲占甲乙两数和的. .
13:2= ÷ = :4=39: .
12: =0.6==6÷ = %
÷20=6: == %= 成=0.15.
:16==24÷ = %