Réponses

2012-11-08T16:22:08+01:00

(1+2x)(9x+1) = 1+11x+18x²

(2x+5)(3x-8) = 6x² -x-40

(3x-3/7)(7x-14) = 21x²-42x-3x+6=21x²-45x+6