(1)0.25×3+25%x=4.75,
0.75+25%x=4.75,
0.75+25%x-0.75=4.75-0.75,
25%x=4,
25%x÷25%=4÷25%,
x=16;
(2)
2
3 x=
5
12 ,
2
3 x÷
2
3 =
5
12 ÷
2
3 ,
x=
5
8 ;
(3)4x-1.6x=48,
2.4x=48,
2.4x÷2.4=48÷2.4,
x=20.
(1)0.25×3+25%x=4.75,
0.75+25%x=4.75,
0.75+25%x-0.75=4.75-0.75,
25%x=4,
25%x÷25%=4÷25%,
x=16;
(2)
2
3 x=
5
12 ,
2
3 x÷
2
3 =
5
12 ÷
2
3 ,
x=
5
8 ;
(3)4x-1.6x=48,
2.4x=48,
2.4x÷2.4=48÷2.4,
x=20.