(1)
8
9 X=
1
6 ×
16
51 ,
8
9 X×
9
8 =
1
6 ×
16
51 ×
9
8 ,
X=
1
17 ;
(2)X÷
3
4 =
1
2 ,
X÷
3
4 ×
3
4 =
1
2 ×
3
4 ,
X=
3
8 ;
(3)
2
3 X÷
1
4 =12,
2
3 X÷
1
4 ×
1
4 =12×
1
4 ,
2
3 X=3,
2
3 X×
3
2 =3×
3
2 ,
X=
9
2 .
(1)
8
9 X=
1
6 ×
16
51 ,
8
9 X×
9
8 =
1
6 ×
16
51 ×
9
8 ,
X=
1
17 ;
(2)X÷
3
4 =
1
2 ,
X÷
3
4 ×
3
4 =
1
2 ×
3
4 ,
X=
3
8 ;
(3)
2
3 X÷
1
4 =12,
2
3 X÷
1
4 ×
1
4 =12×
1
4 ,
2
3 X=3,
2
3 X×
3
2 =3×
3
2 ,
X=
9
2 .