Réponses

2013-12-31T16:57:58+01:00
1)

A = x^2 - 2 * 3x + 3^2 + x - 2x^2 - 3 + 3 * 2x
A = x^2 - 6x + 9 + x - 2x^2 - 3 + 6x
A = x^2 + 6 + x - 2x^2
A = -x^2 + x + 6