(1)1375-15×80,
=1375-1200,
=175;
(2)25-29.5÷(3.2+2.7),
=25-29.5÷5.9,
=25-5,
=20;
(3)54.2-17.6+25.8-12.4,
=(54.2+25.8)-(17.6+12.4),
=80-30,
=50;
(4)48×(1-
3
8 )+2,
=48×1-48×
3
8 +2,
=48-18+2,
=32;
(5)
16
27 ×
1
7 +
5
27 ÷7,
=
16
27 ×
1
7 +
5
27 ×
1
7 ,
=(
16
27 +
5
27 )×
1
7 ,
=
7
9 ×
1
7 ,
=
1
9 ;
(6)[
15
16 -(
3
8 +
1
4 )]÷
15
32 ,
=[
15
16 -
5
8 ]÷
15
32 ,
=
5
16 ×
32
15 ,
=
2
3 .