2) $$\frac{d^3}{c - 3d} \cdot (\frac{c}{d} - 3) = \frac{d^3}{c - 3d} \cdot \frac{c - 3d}{d} = \frac{d^3(c - 3d)}{(c - 3d)d} = \frac{d^3}{d} = d^2$$.
Ответ: $$d^2$$