Bonjour,
je suppose que la consigne demande de factoriser.....
A = 9 × a + 9 × 8 = 9 × (a + 8)
B = 5b + 25 = 5 × (b + 5)
C = 9c - 6 = 3 × (3c - 2)
D = -6d + 18 = -6 × (d - 3) ou 6 × (-d + 3) ou 6 × (3 - d)
E = 28x + 21y = 7 × (4x + 3y)
F = 13x² - 13 = 13 × (x² - 1)
