А) x^2+2xy-4x-8y = x(x+2y) - 4(x+2y) = (x-4)(x+2y)Б) 3a(b+4)+2c(-b-4) = 3ab + 12a - 2bc - 8c = 3ab - 2bc + 12a - 8c
А) x^2+2xy-4x-8y = x(x+2y) - 4(x+2y) = (x-4)(x+2y)
Б) 3a(b+4)+2c(-b-4) = 3ab + 12a - 2bc - 8c = 3ab - 2bc + 12a - 8c