(1)0.4:X=
2
5 :
3
8
2
5 X=0.4×
3
8
2
5 X=0.15,
2
5 x ÷
2
5 =0.15 ÷
2
5
X=0.375;
(2)X:
2
3 =
3
4 :
1
3 ,
1
3 x=
2
3 ×
3
4 ,
1
3 x=
1
2 ,
1
3 x ÷
1
3 =
1
2 ÷
1
3 ,
x=1.5;
(3)X:
1
2 =
3
5 :
1
6 ,
1
6 x=
1
2 ×
3
5 ,
1
6 x=
3
10 ,
1
6 x ÷
1
6 =
3
10 ÷
1
6 ,
x=1.8.