Réponses

2013-03-17T16:21:51+01:00
A) =(-1/4)*(-2/5)+(x/4)-(4x/5)-2x^2
=(2/20)+((5x-16x)/20)-2x^2
=-2x^2 -(9x/20)+(1/10)

b) =2x^2 -3x +10x -15
= 2x^2 +7x -15