3/14:7/9=3/14X(9/7)=27/98
6/25:2/5=6/25X(5/2)=3/5
3/8:0.25 =3/8x(4/1)=3/2
3:3/10=3X(10/3)=10
3:(12)=(6)÷24=0.25=36/（144）=（25）%