в) \(\frac{x^2-16}{8x^3} \cdot \frac{4x}{x+4}\) = \(\frac{(x-4)(x+4)}{8x^3} \cdot \frac{4x}{x+4}\) = \(\frac{4x(x-4)(x+4)}{8x^3(x+4)}\) = \(\frac{x-4}{2x^2}\)