Répondre :
Réponse :
bonsoir
a) + 2 + ( - 4 ) = 2 - 4 = - 2
b) - 9 + 9 = 0
c) - 7 + ( - 2 ) = - 7 -2 = -9
d) + 1 + ( + 4 ) = 1 +4 = 5
Explications étape par étape :
. = 2 - 4 = -2
b. = 9 - 9 = 0
c. = -7 - 2 = -9
d = 1 + 4 = 5
b. = 9 - 9 = 0
c. = -7 - 2 = -9
d = 1 + 4 = 5