①6X÷
3
4 =24,
6X=24×
3
4 ,
6X=18,
X=3;
②X+
3
5 X=
16
17 ,
1
3
5 X=
16
17 ,
X=
16
17 ÷
8
5 ,
X=
10
17 ;
③
4
5 X-18×
2
3 =4,
4
5 X-12=4,
4
5 X=16,
X=20.
①6X÷
3
4 =24,
6X=24×
3
4 ,
6X=18,
X=3;
②X+
3
5 X=
16
17 ,
1
3
5 X=
16
17 ,
X=
16
17 ÷
8
5 ,
X=
10
17 ;
③
4
5 X-18×
2
3 =4,
4
5 X-12=4,
4
5 X=16,
X=20.