Jawabanmu

2014-08-13T21:22:38+07:00
Penambahan :
5 + (-1) = 4
-2 + 8 = 6
-5 + -7 = -12
3 + (-9) = -7

pengurangan :
-9 - (-4) = -5
-3 - 2 = -5
4 - (-5) = 9
1 - (-2) = 3