((Х^2 – 5 * Х)/(Х^2 - 10 * Х + 25) + 25/(Х^2 - 25)) * ((5 + x)/(125 - x^3)). (Х^2 – 5 * Х)/(Х^2 – 10 * Х + 25) = Х * (Х – 5)/(X – 5)^2 = X/(X – 5). X/(X – 5) + 25/(X^2 – 25) = X/(X – 5) + 25/(X – 5) * (X + 5) = (X^2 + 5 * X + 25)/(X – 5) * (X + 5). (X^2 + 5 * X + 25)/((X – 5) * (X + 5)) * ((5 + Х)/(125 – X^3)) = (X^2 + 5 * X + 25)/((X – 5) * (X + 5)) * ((5 + Х)/(5 – Х) * (25 + 5 * X + X^2)) = (5 + X)/(X – 5) * (X + 5) * (5 – X) = -1/(X – 5)^2. Ответ: -1/(X – 5)^2.