fatsome2003

Réponse :

1)      8x -28 +10-8x  = -18

2)    x+5-x + 3  =  8

3)x/1  -2/3   =3x/3 -2/3  = (3x-2)/3

Adam

userresu 1) = 4(2x-7)
= 8x - 28 + 10 - 8x
= -18 car +8x - 8x = 0 et -28 + 10 = -18

2) = (x+5) - (x-3)
= [ x + 5 - x + 3 ]
= 8 car +x -x = 0 et 5 + 3 = 8

3) = (x - 2*3)
= 1*3 x (3x - 2) donc = 1*3(3x - 2)

Bonne soirée !