Bonsoir,
A = 5(6 - y)
A = 30−5y
B = 7z(2 - 9z)
B = 14z − 63z²
C = (7 - 3x)(9x - 3)
C = −27x² + 72x − 21
D = (z-2) (3 - z)
D = − z² + 5z − 6
E = 3(4x + 7) + 4(2x - 9)
E = 4(2x - 9) + 3(4x + 7)
E = 20x − 15
F = 7x( 2x - 5) - x(2x - 5)
F = 12x² − 30x
Bon Courage ; )