Сократить: a) $$rac{72p^5q^9}{64p^{10}q^6}$$ б) $$rac{12ab - 6b^2}{2a^2 - ab}$$ в) $$rac{2x^2 - 32}{x^2 + 4x}$$

a) $$\frac{72p^5q^9}{64p^{10}q^6} = \frac{9q^3}{8p^5}$$ б) $$\frac{12ab - 6b^2}{2a^2 - ab} = \frac{6b(2a-b)}{a(2a-b)} = \frac{6b}{a}$$ в) $$\frac{2x^2 - 32}{x^2 + 4x} = \frac{2(x^2 - 16)}{x(x+4)} = \frac{2(x-4)(x+4)}{x(x+4)} = \frac{2(x-4)}{x}$$