Réponse :
bonjour
Explications étape par étape :
A=2+(-8) +7+(-12)+(-5)+4+(-2)
=2+7+4 -8-12-5-2
=13 - 27
= -14
B=-5+ (-4)-15-(-6)+7
= -5-4-15+6 +7
=-30+13
= -11
C=-14-14+30+ (-15)-(-20)
=-14-14-15 +30+20
=-43+50
=7
D=-4+(-3)-5-3+(-2)
-4-3-5-3-2
=-17
E=3-12+15-17-23
=3+15 -12-17-23
=18-52
=-34