bonjour

a = - 13

b = - 9 + 4 = - 5

c = 9 - 4 = - 5

d ) 9 + 4 = 13

e  = - 4 + 9 = 5

f = - 4 - 9 = - 13

Réponse

a) = -13

b) = -5

c) = -5

d) = 13

e) = 5

f) = -13