(1)42÷(
5
14 ÷
2
7 )
=42÷
5
4
=33
3
5 ;
(2)(
1
6 ×
3
8 )×24
=
1
16 ×24
=
3
2 ;
(3)
11
20 ×2.5×
10
11 ×4
=(
11
20 ×
10
11 )×(4×2.5)
=
1
2 ×10
=5;
(4)
1
9 ×24+24×
8
9
=(
1
9 +
8
9 )×24
=1×24
=24.
(1)42÷(
5
14 ÷
2
7 )
=42÷
5
4
=33
3
5 ;
(2)(
1
6 ×
3
8 )×24
=
1
16 ×24
=
3
2 ;
(3)
11
20 ×2.5×
10
11 ×4
=(
11
20 ×
10
11 )×(4×2.5)
=
1
2 ×10
=5;
(4)
1
9 ×24+24×
8
9
=(
1
9 +
8
9 )×24
=1×24
=24.