Réponses

2014-09-19T00:33:42+02:00
A=-4x×4x-4x×(-7)-5×4x-5×(-7)=16x€2-28x-20x-35=16x€2-48x-35 B=8×(-2x)-8×(-5)-8x×(-2x)-8x×(-5)=16x-40-16x€2-40x=16x€2-24x-40 C=3(28x€2+20x-49x-35)=3(28x€2-29x-35)=84x€2-87x-105 D=2x(-10x€2-5x-70x-35)=2x(-10x€2-75x-35)=-20x€3-150x€2-70x 12-A=64x€2-96x+36 B=9x€2+21x-21x-49=9x€2-49 C=36x€2+12x+1