1) x(1-x)+(x-1)(x+2)
= x (-1) (-1+x) + (x-1) (x+2)
= (x-1) ( -x + (x+2))
= (x-1) (2)
develloper donne
= 2x-2
2)(3x+6) (x-4)-(x+2)(x+1)
= 3 (x+2) (x+4) - (x+2) (x+1)
= (x+2) ( 3 (x+4) - (x+1))
developper donne
= (x+2) (3x+12-x-1)
= (x+2) (2x+11)
3)x(5x-2)+x
= x (5x-2) + x 1
= x ((5x-2)+1)
= x (5x-2+1)
= x (5x-1)
4)(3x+1)²-4
= ((3x+1)-2) ((3x+1)+2)
= (3x-1) (3x+3)
= 3 (3x+1) (x+1)
5)(x-1)²+2(x²-1)
= (x+1)² + 2 (x-1) (x+1)
= (x+1) ( (x+1) + 2 (x-1))
developpons un peu
= (x+1) ((x+1) + 2x-2)
= (x+1) (3x-1)
a vérifier