给含盐率是10%的75克盐水中加入5克盐,全部溶解后,盐水的含盐率是 .
÷25= :8=27÷ =3.
0.75=12÷ = :12== %= 折.
0.75=12÷ =9: = %
0.7=7÷ = :30== %
3÷5= = :15== %