1
.
2a
-
5a
+
35a
-
23a
=
____________________
2
.
34mn
+
36mn
-
56mn
=
____________________
3
.
45a
-
25a
+
56a
-
28a
+
a
=
____________________
4
.
278b
-
367b
-
471b
+
457b
=
-
____________________
5
.
-
98mn
+
456mn
-
22mn
+
48mn
=
____________________
6
.
35c
+
30c
-
74c
+
11c
-
48c
+
36c
=
-
____________________
7
.
103b
-
47b
+
304b
-
345b
+
213b
=
____________________
8
.
451xy
+
123xy
-
654xy
+
98xy
-
xy
=
____________________
9
.
-
86c
+
54c
+
32c
-
231c
+
78c
-
234c
=
-
____________________
10
.
56xy
+
44xy
-
100xy
+
35xy
+
26xy
-
14xy
=
____________________
