Réponses

Meilleure réponse !
2014-10-11T12:03:28+02:00
a=-3+5-2+1= 3+5+1 -2 =9 -2 = 7

b=5-4+2-6= 5+2 -4-6 = 7-10 = -3

c=-6+5-4+3-2-1+7= 5 +3+7 -6-4-2-1 =15 -13 = 2

d=12-7+(-6)-(-13)+(-12)= 12 -7 -6 +13 -12 =12 +13 -7-6-12 = 25 -25 = 0

e=(3-5)+(1-4+6)-(-2+9)= -2 +3 -(7) =-2 +3 +7 =  -2+10  =  8

f=2-(5+7-3)-9(-3+6)=
2 -(+9) - 9 (+3) = 2 -9 -27 = 2 -36 =  -34