(1)48×(
1
8 +
1
6 )
=48×
1
8 +48×
1
6
=6+8
=14;
(2)4 ÷
5
3 ÷
9
20
=4÷(
5
3 ×
9
20 )
=4 ÷
3
4
= 5
1
3 ;
(3)
3
10 ×(
5
7 -
10
21 )
=
3
10 ×
5
7 -
3
10 ×
10
21
=
3
14 -
1
7
=
1
14 ;
(4)(12÷
3
4 +19)×
2
5
=(16+19)×
2
5
=35×
2
5
=14;
(5)12×(
3
5 ÷
4
5 )
=12×
3
4
=9;
(6)18×(
2
3 +
1
9 -
1
6 )
=18×
2
3 +18×
1
9 -18×
1
6 )
=12+2-3
=11.