Factorise les expression suivantes : A = 54 - 18a B = -49 + 21x C = -36z + 63 D = 5b + 25 E = 3x² + x F = 8t² + 2t G = -x + 3x² H = 3y² + 9y²

bonjour

a = 18 ( 3 - a)

b = 7( - 7 + 3 x)

c) 9 ( - 4 z + 7)

d) 5 (b + 5)

e) x ( 3 x + 1)

f) 2t ( 4 t + 1)

g) x ( - 1 + 3 x)

h) 3y² ( 1 + 3) = 3 y² ( 4) 

A = 3(18-a)
B= 7 (-7 +3x)
C= 9(-4x +7)
D = 5(b +5)
E = x(3x +1)
F = 2t( 4t +1)
G= x(-1+3x)
H =  3y²(1 +3)