(1)
7
9 ÷
1
27 ÷
7
4 ,
=
7
9 ×27×
4
7 ,
=12;
(2)
5
7 ×6+
5
7 ,
=
5
7 ×(6+1),
=
5
7 ×7,
=5;
(3)
5
9 ×
3
8 ÷
5
36 ,
=
5
9 ×
3
8 ×
36
5 ,
=
3
2 ;
(4)(
3
4 -
5
7 )÷
1
56 ,
=(
3
4 -
5
7 )×56,
=
3
4 ×56-
5
7 ×56,
=42-40,
=2;
(5)
4
9 -
7
16 ×
4
9 ,
=(1-
7
16 )×
4
9 ,
=
9
16 ×
4
9 ,
=
1
4 ;
(6)(0.25+
5
16 ×
12
5 )÷
3
5 ,
=(
1
4 +
3
4 )×
5
3 ,
=1×
5
3 ,
=
5
3 ;
(7)
5
13 ÷7+
1
7 ×
8
13 ,
=
5
13 ×
1
7 +
1
7 ×
8
13 ,
=
1
7 ×(
5
13 +
8
13 ),
=
1
7 ×1,
=
1
7 ;
(8)(
1
3 -
1
4 )÷
1
6 +
1
2 ,
=
1
12 ×6+
1
2 ,
=
1
2 +
1
2 ,
=1.