Answer:
The first and the third one are definitely equal to 0 (can't see the fourth one)
Explanation:
If the part that is between the '()' in the upper half is equal to 0, the whole equation is equal to 0
1) -1 + 1 = 0
2) -1 -1 = -2 (so not equal to 0)
3) -1 - (-1) = -1 + 1 = 0