甲、乙两个数的比是3:5,已知甲比乙少30,那么甲数是 .
4÷5==== 小数.
÷12==0.75= : = 折= %
12÷ =0.25= %= :24== (填成数)
9÷ == :8= (填小数)
20: = ÷20==0.8= %