Réponses

2012-12-13T19:29:07+01:00

1. (2x)X(x)+(2x)X(1)+5X(x)+5X1=2x²+2x+5x+5=2x²+7x+5

 

Meilleure réponse !
2012-12-13T19:29:28+01:00

a = 2x²+2x+5x+5 = 2x² +7x+5

b = 6y²+4y-3y-2 = 6y²+y-2

c = 3x²-x+21x-7 = 3x² +20x -7

d = 4t²-2t-6t+3 = 4t² -8t +3