Réponses

2014-09-22T14:15:16+02:00
A.-3*-5+2=15+2=17

b.4*-5-(-5)puissance 2
-20-(-25)
-20+25=5
c.8-2*-5=8-*-10)=8+10=18
d.(-5+2)*(7-(-7))=
(-3)*(14)=-42.