一件工作甲独做5小时完成,乙独做6小时完成,甲与乙工作效率比是 : .
10÷ == : = (小数)= %
:20==24÷ =80%
3:4==24÷ = %= .(填小数)
75÷ == .
= :10=0.2=10÷ = %.