Сократить дробь х^2-2x-3 \ x-3
Х^2-2x-3 \ x-3 = x² - 2x + 1 - 4 (x - 1)² - 2² (x - 1 + 2)(x - 1 - 2) = ---------------------- = ---------------- = ----------------------------- = x - 3 x - 3 x - 3 (x + 1)(x - 3) = ---------------------- = x + 1 x - 3