Réponses

2014-09-05T20:02:07+02:00

Exercice 41:
A= -11 +4 +17-9-1 = -21+21 = 0

B= -(11+4)+17-(9-1) = -15+17-8= -23+17= -6


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




2014-09-05T20:51:18+02:00
Bonsoir
A = +21 - 21 = 0
B = -11-4+17-9+1 = +18 - 24 = - 6
C = - 11 -4 -17 -9 +1 = -41 +1 = -40