Jawabanmu

2014-08-12T14:31:23+07:00
2 - (-1) = 2 + 1 = 3
5 - 7 = -1
-2 + 6 = 4
-4 - 2 = -6
3 + 4 = 7
1 3 1
2014-08-12T15:37:04+07:00