(1)
5
7 × 16-2÷
7
5 ,
=
5
7 ×16-2×
5
7 ,
=(16-2)×
5
7 ,
=14×
5
7 ,
=10;
(2)
12
13 ×(
5
2 -
1
3 ),
=
12
13 ×
5
2 -
12
13 ×
1
3 ,
=
30
13 -
4
13 ,
=2;
(3)[6.85-(0.65+0.7)]÷2.5,
=[6.85-1.35]÷2.5,
=5.5÷2.5,
=2.2;
(4)(
3
7 +
3
5 )×7+
4
5 ,
=
3
7 × 7+
3
5 × 7+
4
5 ,
=3+(
21
5 +
4
5 ),
=3+5,
=8.