Réponses

Meilleure réponse !
2014-04-17T21:18:41+02:00
Bonsoir

(+4) + (+9)  = 4 +9 = 13
(-2) + (+3) = -2+3 = 1
(-4) + (-11) = -4 -11 = - 15

(+1) + (-7) = 1 -7 = -6
(-10)+ (+10) = -10+10 = 0
(-40) + (+40)
= -40+40 = 0

  • Utilisateur Brainly
2014-04-17T21:19:06+02:00
Simplifier puis calculer :

(+4) + (+9) = 4 + 9 = 13
(-2) + (+3) = - 2 + 3 = 1
(-4) + (-11) = - 4 - 11 = - 15

(+1) + (-7) = 1 - 7 = -6
(-10)+ (+10) = - 10 + 10 = 0
(-40) + (+40) = - 40 + 40 = 0

Bonne soirée! :)