Réponses

2013-11-15T19:29:09+01:00
X²+2x-2x-4-(x²+3x-3x-9)
x²+2x-2x-4-x²-3x+3x+9 =5

OU

(x²-2²)- (x²-3²)
x²-4-x²+9 = 5

2013-11-15T19:30:43+01:00