Respuesta :

1.
2 + 3 = 1 + 3

2.
2 + 7 = 4 + 6

3.
3 + 1 = 1 + 3

4.
1 + 2 = 1 + 2

5.
4 + 5 = 4 + 6

6.
2 + 1 = 1 + 2

7.
1 + 6 = 2 + 6

8.
2 + 3 = 1 + 6