Réponses

2013-03-27T16:41:55+01:00

(8x-8)(4x-7)-(-5+9x)(3x-9)

(32x²-56x-32x+56)-(-15x+45+27x²-81x)

32x²-56x-32x+56+15x-45-27x²+81x

5x²+8x+11

2013-03-27T16:46:09+01:00
(8x+(-8))(4x+(-7))-(-5+9x)(3x+(-9))
(8x-8)(4x-7)(+5-9x)(3x+9)
32x au carré -56x-32x+56+15x+45-27x au carré -81x
5x au carré -154x + 101

Voooila :)