甲数与乙数的比是7:9,乙数是甲数的 ,甲数是甲、乙两数之和的 .
÷25= :8=27÷ =3.
0.75=12÷ = :12== %= 折.
0.75=12÷ =9: = %
0.7=7÷ = :30== %
3÷5= = :15== %