Niveau 5ème! Exercice 80 et 81 svp! Merci d'avance.

bon le 80 : 7 x +14 =( 7+14) x = 21 x
9y -27 = (27 -9)y = 18y
x² × 2x = (x×x) × (x×2)=x(x×2)
35 +5ab =(35+5)ab= 40ab

bonsoir

7x+14 = 7(x+2)

9y-27 = 9(y-3)

x²-2x = x(x-2)

35+5ab = 5(7 +ab)

exercice 81

8x+8 = 8(x+1)

27a+9 = 9(3a+1)

35-7x= 7(5 -x)

m -2m² = m(1 -2m)

6y²+6y = 6y (y +1)