Réponses

2012-10-11T07:50:04+02:00

(x-1)(11-x)+5(x-1)²-[2(x-1)(2x+3)]=0

(x-1)[11-x+5(x-1)-[2(2x+3)]=0

(x-1)[11-x+5x-5-(4x+6)]=0

(x-1)[11-x+5x-5-4x-6]=0

(x-1)(10)=0

 

Je te laisse conclure