7
.
____________________
=
21
-
25
:
____________________
=
-
5
-
9
.
____________________
=
-
81
4
.
(
-
____________________
)
=
-
48
-
____________________
:
(
-
6
)
=
5
-
____________________
.
(
-
8
)
=
64
2000
:
(
-
____________________
)
=
-
1000
3
.
(
-
____________________
)
.
(
-
2
)
=
30
-
2
.
(
-
____________________
)
.
9
=
18
40
:
(
-
10
)
.
____________________
=
-
2
4
