а) 2a - ac - 2c + c^2 = a(2 - c) - c(2 - c) = (a - c)(2 - c)
б) bx + by - x - y - ax - ay = b(x + y) - (x + y) - a(x + y) = (b - 1 - a)(x + y)
а) 2a - ac - 2c + c^2 = a(2 - c) - c(2 - c) = (a - c)(2 - c)
б) bx + by - x - y - ax - ay = b(x + y) - (x + y) - a(x + y) = (b - 1 - a)(x + y)