(1)
8
9 ×x=
2
3 ,
8
9 ×x×
9
8 =
2
3 ×
9
8 ,
x=
3
4 ;
(2)x ÷
5
6 =
9
10 ,
x ÷
5
6 ×
5
6 =
9
10 ×
5
6 ,
x=0.75;
(3)7.2x-2x=41.6,
5.2x=41.6,
5.2x÷5.2=41.6÷5.2,
x=8.
(1)
8
9 ×x=
2
3 ,
8
9 ×x×
9
8 =
2
3 ×
9
8 ,
x=
3
4 ;
(2)x ÷
5
6 =
9
10 ,
x ÷
5
6 ×
5
6 =
9
10 ×
5
6 ,
x=0.75;
(3)7.2x-2x=41.6,
5.2x=41.6,
5.2x÷5.2=41.6÷5.2,
x=8.