①0.6-0.2×1.9÷7.6,
=0.6-0.38÷7.6,
=0.6-0.05,
=0.55;
②5÷
5
7 -
5
7 ×
1
5 ,
=5×
7
5 -
5
7 ×
1
5 ;
=7-
1
7
=6
6
7 ;
③1.02÷(5+0.4×0.25),
=1.02÷(5+0.1),
=1.02÷5.1,
=0.2;
④
7
12 ÷(
1
2 +
2
3 )×
2
5 ,
=
7
12 ÷
7
6 ×
2
5 ,
=
7
12 ×
6
7 ×
2
5 ,
=
1
2 ×
2
5 ,
=
1
5 ;
⑤3÷
3
4 ×(
4
5 -
3
10 ),
=3÷
3
4 ×
1
2 ,
=3×
4
3 ×
1
2 ,
=4×
1
2 ,
=2.