Bonjour,

A) 2+(-8)+7+(-12)+(-5)+4+(-2)

2-8+7-12 -5 +4 -2 = 2

B) -5+(-4)-15-(-6)+7

-5 -4 -15 +6 +7 = -11

C) -14-14+30+(-15)-(-20)

-14 -14 7 +30 -15 +20 =  7

D) -4+(-3)-5-3+(-2)

-4 -3 -5 -3 -2 = -17

E) 3-12+15-17-23= -34

règle :

-(-) =>+

+(+) => +

-(+) => -

+(-) => -