Réponses

2014-10-11T15:43:43+02:00
A) 5+(-9)+6=5-9+6=-4+6=2
b)-8+11+(-2)=-8+11-2=3-2=1
c)-9+(-8)+3-(-2)=-9-8+3+2=-17+5=-12
d)12-7+(-6)-(-13)+(-12)=5-6+13-12=-1+1=0
e)(3-5)+(1-4+6)-(-2+9)=(-2)+(3)-(7)=-6
f) 2-(5+7-3)-9-(3+6)=2-(9)-9-(9)=-25