4ц1/6 *x^8 * y^5 * (-1ц(1/5) * x^5 * y)^3 = 25/6 * x^8 * y^5 * (-6/5 *x^5*y)^3 = =25/6 * x^8 *y^5 * ((-6)³/5³) * x^15 * y^3 = -36/5 * x^23 * y^8