ГДЗ по алгебре 9 класс Мерзляк Задание 221

\[\boxed{\text{221\ (221).}\text{\ }\text{Еуроки\ -\ ДЗ\ без\ мороки}}\]

\[1)\ 2x - \frac{m}{n} = 2\]

\[2x = 2 + \frac{m}{n}\]

\[2x = \frac{2n + m}{n}\]

\[x = \frac{2n + m}{2n}.\]

\[2)\frac{1}{m} - \frac{1}{x} = \frac{1}{n}\]

\[\frac{1}{m} - \frac{1}{n} = \frac{1}{x}\]

\[\frac{n - m}{\text{mn}} = \frac{1}{x}\]

\[x(n - m) = mn\]

\[x = \frac{\text{mn}}{n - m}\text{.\ }\]