Bonjour,
17. Effectue les additions suivantes:
(+12) + (+9) = 12 + 9 = 21
(-6) + (+3) = -6 + 3 = -3
(-4) + (-1) = -4 - 1 = -5
(+4) + (-19) = 4 - 19 = -15
18. Effectue les additions suivantes:
(-3) + (-11) = -3 - 11 = -14
(+4) + (-4) = 4 - 4 = 0
(-5) + (+15) = -5 + 15 = 10
(-53) + (+0) = -53 + 0 = -53
Bonne journée.
