Réponses

  • Omnes
  • Modérateur confirmé
2014-03-01T16:00:54+01:00
Salut,

A = x(x+4)
A = x*x + x * 4 = x² + 4x

B = 7y(2-9y)
B = 7y * 2 - 9y * 7y
B = 14y - 63y²

C = -2(5-y)
C = (-2) * 5 + (-2) * (-y)
C = -10 + 2y

Bonne journée !