a) (1/2 * x-1 * y2)-3 = (1/2)-3 * (x-1)-3 * (y2)-3 = 23 * x3 * y-6 = 8x3/y6
б) (2x-4 / 5y-3)-1 * 6xy2 = (5y-3 / 2x-4) * 6xy2 = (5y3 / 2x-4) * 6xy2 = (5y3 * x4 / 2) * 6xy2 = 15x5y5