Question

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

Answer 1

Explicación:

47-178=131

35+158=193

78-1881=1803

56-26=30

1013-513213=512200

69-49=20

68-28=40