(1)(
3
8 +
5
6 )÷
1
24 ,
=(
3
8 +
5
6 )×24,
=
3
8 ×24+
5
6 ×24,
=9+20,
=29;
(2)2.5×13×0.42,
=32.5×0.42,
=16.65;
(3)5.3×12-33.46÷0.35,
=63.6-95.6,
=-32;
(4)
8
9 ÷[(
2
5 +
1
10 )×
3
4 ],
=
8
9 ÷[
1
2 ×
3
4 ],
=
8
9 ×
8
3 ,
=
64
27 ;
(5)9.34-(2.34+0.49),
=9.34-2.34-0.49,
=7-0.49,
=6.51;
(6)
4
5 +
4
5 ×19,
=
4
5 ×(1+19),
=
4
5 ×20,
=16.