Numeros Enteros

2 + 2 = ____________________
- ____________________ + 3 = 2
5 + 4 = ____________________
- 100 + ____________________ = - 20
0 - 1 = - 1
1 - ____________________ = 0
- ____________________ + 1 = 0
- 2 - ____________________ - 1 = - 1 9