Réponses

2012-11-05T16:08:03+01:00

x*2x+x*3-5*2x-5*3-2x*x-2x*1

2x²+3x-10x-15-2x²-2x

-9x-15

2012-11-05T16:10:22+01:00

(x-5)(2x+3)-2x(x+1)=x^2+3x-10x-15-(2x^2+2x)=(0x^2)-9x-15