\[\boxed{\text{66.\ }\text{еуроки}\text{-}\text{ответы}\text{\ }\text{на}\text{\ }\text{пятёрку}}\]
Пояснение.
Решение.
\[\textbf{а)}\ \frac{x^{2}}{(x - 5)^{2}} - \frac{25}{(5 - x)^{2}} =\]
\[= \frac{x^{2}}{(x - 5)^{2}} - \frac{25}{(x - 5)^{2}} =\]
\[= \frac{x + 5}{x - 5}\]
\[\textbf{б)}\ \ \frac{x^{2} + 25}{(x - 5)^{3}} + \frac{10x}{(5 - x)^{3}} =\]
\[= \frac{x^{2} + 25}{(x - 5)^{3}} - \frac{10x}{(x - 5)^{3}} =\]
\[= \frac{1}{x - 5}\]