Réponses

2014-01-08T19:48:43+01:00
Ex 26 : 

a). 5x + 4x = x(5+4) = 9x 
b). 9x - 2x = x(9-2) = 7x
c). 6x + x = x(6+1) = 7x
d). 2x + 7x - 5x = x(2+7-5) = 4x
e). 8xy - 7xy = xy(8 - 7) = xy
f). 5ab - 9ab + ab = ab(5-9+1) = -3ab
g). 18z² - 9z² + 3z² = z²(18-9+3) = 12z²
h). a³ + a³ + a³ = a³ (1+1+1) = 3a³
i). 1/2 x + 1/2x = 1/2x (1+1) = 2/4x

Ex 27 : 

a). 4x+8 = 2(2x+4)
b).7+21x = 7(3x+1)
c). 2 -16x = 2(-8x +1)
d). x² + 8x = x(x+8) -> je suis pas sure