ГДЗ по математике 6 класс Мерзляк ФГОС Задание 381

\[\boxed{\mathbf{381}\mathbf{.}}\]

\[1)\ \left( x - \frac{11}{30} \right) - \frac{16}{45} = \frac{2}{9}\]

\[x - \frac{11}{30} = \frac{2^{\backslash 5}}{9} + \frac{16}{45}\]

\[x - \frac{11}{30} = \frac{10}{45} + \frac{16}{45}\]

\[x - \frac{11}{30} = \frac{26}{45}\]

\[x = \frac{26^{\backslash 2}}{45} + \frac{11^{\backslash 3}}{30}\]

\[x = \frac{52 + 33}{90} = \frac{85}{90}\]

\[x = \frac{17}{18}.\]

\[2)\ 9\frac{9}{28} - \left( 4\frac{5}{21} - x \right) = 6\frac{2}{7}\]

\[4\frac{5}{21} - x = 9\frac{9}{28} - 6\frac{2^{\backslash 4}}{7}\]

\[4\frac{5}{21} - x = 9\frac{9}{28} - 6\frac{8}{28}\]

\[4\frac{5}{21} - x = 3\frac{1}{28}\]

\[x = 4\frac{5^{\backslash 4}}{21} - 3\frac{1^{\backslash 3}}{28}\]

\[x = 4\frac{20}{84} - 3\frac{3}{84}\]

\[x = 1\frac{17}{84}.\]