(
20
+
30
)
+
10
=
____________________
(
25
+
10
)
+
20
=
____________________
(
11
+
4
)
-
3
=
____________________
50
+
(
40
+
10
)
=
____________________
5
+
(
13
+
12
)
=
____________________
5
+
(
7
-
3
)
=
____________________
(
10
+
20
)
+
60
=
____________________
(
4
+
40
)
+
36
=
____________________
(
10
+
6
)
-
2
=
____________________
15
+
(
10
+
15
)
=
____________________
18
+
(
40
+
20
)
=
____________________
15
+
(
30
-
25
)
=
____________________
