Réponses

2012-09-12T14:51:59+02:00
Meilleure réponse !
2012-09-12T15:00:02+02:00

-11 + 4 + 17 -9 -1 =  - 11 + 21 - 9 -1 = 10 - 9 -1 = 0

- (11 + 4) + 17 -(9-1) = -15 + 17 -8 = 2 - 8 = -6

- (11 + 4 + 17) - (9-1) = -32 - 8 = - 40

Voilà