Réponses

2014-01-12T10:57:56+01:00
Bonjour
a=(x-1)(2x+16+1)
a=(x-1)(2x+17)

b=(x-1)(x+1)+3(6x-7)(x-1)
b=(x-1)(x+1+18x-21)
b=(x-1)(19x-20)

c=(x-1)(5x+9)-3 (4x-7) (x-1)
c=(x-1)(5x+9-12x+21)
c=(x-1)(-7x+30)
d=x×x-2x+1+5 (x-1)=(x-1)^2+5 (x-1)=(x-1)(x-1+5)=(x-1)(x+4)