д) \(\frac{c^2+4c+4}{2c-6} \cdot \frac{c^2-9}{5c+10}\);

д) \(\frac{c^2+4c+4}{2c-6} \cdot \frac{c^2-9}{5c+10}\) = \(\frac{(c+2)^2}{2(c-3)} \cdot \frac{(c-3)(c+3)}{5(c+2)}\) = \(\frac{(c+2)^2(c-3)(c+3)}{10(c-3)(c+2)}\) = \(\frac{(c+2)(c+3)}{10}\)