4
7
-
1
7
8
=
3
5
+
1
5
8
=
7
8
-
1
8
8
1
8
- =
5
6
-
2
6
= 10
13
-
5
13
2
13
- =
6
9
-
4
9
6
8
-
2
8
7
-
1
7
8
=
3
5
+
1
5
8
=
7
8
-
1
8
8
1
8
- =
5
6
-
2
6
= 10
13
-
5
13
2
13
- =
6
9
-
4
9
6
8
-
2
8
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Verified answer
Explicación:
47-178=131
35+158=193
78-1881=1803
56-26=30
1013-513213=512200
69-49=20
68-28=40