(1)
1
4 ÷〔
5
8 ×(
1
6 +
1
3 )〕,
=
1
4 ÷〔
5
8 ×
1
2 〕,
=
1
4 ÷
5
16 ,
=
4
5 ;
(2)
6
7 ÷18+
2
3 ,
=
1
21 +
2
3 ,
=
5
7 ;
(3)(
4
7 -
3
14 )÷
1
28 ,
=(
4
7 -
3
14 )×28,
=
4
7 ×28-
3
14 ×28,
=10;
(4)2.5×32×12.5,
=2.5×(4×8)×12.5,
=(2.5×4)×(8×12.5),
=10×100,
=1000.