\[\boxed{\text{64\ (64).\ }\text{Еуроки\ -\ ДЗ\ без\ мороки}}\]
\[\textbf{а)}\ \frac{x^{2}}{(x - 5)^{2}} - \frac{25}{(5 - x)^{2}} =\]
\[= \frac{x^{2}}{(x - 5)^{2}} - \frac{25}{(x - 5)^{2}} =\]
\[= \frac{x^{2} - 25}{(x - 5)^{2}} =\]
\[= \frac{1}{x - 5}\]