Réponses

2013-09-23T19:47:00+02:00
2013-09-23T19:57:02+02:00
Non, (3-2) au carré
= (3-2 )(3-2)
= 3x3 - 3x2 - 2x3 + 2x2
= 9 - 6 -6 +4
= 9+4