(1)625毫升:
3
8 升,
=625毫升:375毫升,
=(625÷125):(375÷125),
=5:3;
625毫升:
3
8 升,
=5:3,
=5÷3,
=
5
3 .
(2)0.8:
2
3 ,
=(
4
5 ×15):(
2
3 ×15),
=12:10,
=6:5;
0.8:
2
3 ,
=6:5,
=6÷5,
=
6
5 .
(3)
3
4 :
1
2 ,
=(
3
4 ×4):(
1
2 ×4),
=3:2;
3
4 :
1
2 ,
=3:2,
=3÷2,
=
3
2 .
(4)0.2小时:20分钟,
=12分钟:20分钟,
=(12÷4):(20÷4),
=3:5;
0.2小时:20分钟,
=3:5,
=3÷5,
=
3
5 .
故答案为:5:3,
5
3 ,6:5,
6
5 ,3:2,
3
2 ,3:5,
3
5 .