Réponses

2014-05-13T16:22:50+02:00
4)   17-31 ; -8-6 ;-23+9 ; -42-(-28) ; -9-5 ; -30+16 ; -21-(-7) ; -10-4 ; 13-27 ; -32 + 18
5) 17 + (25) = 42
28 + (-21) =7
-12+ (59) =47
-27 + (19) = -8
29 +(-12) = -17
-13 + (-33 ) = -46
-15 + (11) = -4
24 + (-23) = 1