Réponse :
Bonjour,
1) 3/48 × 100 = 6,25 % de réduction.
2) (4x + 5)(x + 13) = 0
Or A × B = 0 signifie que A = 0 ou B = 0
4x + 5 = 0
4x = -5
x = -5/4
x + 13 = 0
x = -13
Donc S = {-5/4 ; -13}
3) P × V = n × R × T
⇔ PV = nRT
T = PV/nR
4) 536 m = 5,36 hm
