2) a) 3/(x²-2x) * (2x-4)/x

2) a) $$\frac{3}{x^2-2x} \cdot \frac{2x-4}{x} = \frac{3}{x(x-2)} \cdot \frac{2(x-2)}{x} = \frac{6(x-2)}{x^2(x-2)} = \frac{6}{x^2}$$

Ответ: 6/x²