ГДЗ по алгебре 7 класс Макарычев Задание 582

\[\boxed{\text{582\ (582).}\text{\ }\text{Еуроки\ -\ ДЗ\ без\ мороки}}\]

\[\textbf{а)}\ 0,3y = 70\]

\[y = \frac{70}{0,3} = \frac{700}{3}\]

\[y = 233\frac{1}{3}\]

\[Ответ:y = 233\frac{1}{3}.\]

\[\textbf{б)}\ \frac{5}{8}x = - 1\]

\[x = - 1\ :\frac{5}{8} = - \frac{8}{5}\]

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

\[Ответ:x = - 1,6.\]

\[\textbf{в)}\ \frac{1}{9}a = - \frac{3}{7}\]

\[a = - \frac{3}{7}\ :\frac{1}{9} = - \frac{3}{7} \cdot 9 = - \frac{27}{7}\]

\[a = - 3\frac{6}{7}\]

\[Ответ:a = - 3\frac{6}{7}.\]