a2 = 2x 6x2a

$$\frac{a^2}{2x} = \frac{a}{12x^2}$$
$$\frac{a^2}{2x} = \frac{a^2}{2x} \cdot \frac{6xa}{6xa} = \frac{6xa^3}{12x^2a}$$

Ответ: 6xa³