(1)
5
6 x+
1
4 =4,
5
6 x+
1
4 -
1
4 =4-
1
4 ,
5
6 x ÷
5
6 =
15
4 ÷
5
6 ,
x=4
1
2 ;
(2)x-
3
5 x=
3
5 ×
2
9 ,
2
5 x=
2
15 ,
2
5 x ÷
2
5 =
2
15 ÷
2
5 ,
x=
1
3 ;
(3)x÷75%=
2
9 ,
x÷75%×75%=
2
9 ×75%,
x=
1
6 .
(1)
5
6 x+
1
4 =4,
5
6 x+
1
4 -
1
4 =4-
1
4 ,
5
6 x ÷
5
6 =
15
4 ÷
5
6 ,
x=4
1
2 ;
(2)x-
3
5 x=
3
5 ×
2
9 ,
2
5 x=
2
15 ,
2
5 x ÷
2
5 =
2
15 ÷
2
5 ,
x=
1
3 ;
(3)x÷75%=
2
9 ,
x÷75%×75%=
2
9 ×75%,
x=
1
6 .