(1)16×
3
4 ÷
4
9 ,
=12 ÷
4
9 ,
=27;
(2)4×
9
7 +4÷
7
5 ,
=4×
9
7 +4×
5
7 ,
=4×(
9
7 +
5
7 ),
=4×2,
=8;
(3)4-(
2
5 +
3
5 ÷
1
2 ),
=4-(
2
5 +
6
5 ),
=4-
8
5 ,
=
12
5 ;
(4)(1-0.6)÷(
2
3 ÷
4
9 ),
=0.4÷
3
2 ,
=
4
15 .
(1)16×
3
4 ÷
4
9 ,
=12 ÷
4
9 ,
=27;
(2)4×
9
7 +4÷
7
5 ,
=4×
9
7 +4×
5
7 ,
=4×(
9
7 +
5
7 ),
=4×2,
=8;
(3)4-(
2
5 +
3
5 ÷
1
2 ),
=4-(
2
5 +
6
5 ),
=4-
8
5 ,
=
12
5 ;
(4)(1-0.6)÷(
2
3 ÷
4
9 ),
=0.4÷
3
2 ,
=
4
15 .