Решите уравнение:
1)

\frac{7 x}{6} - \frac{5 x}{18} = \frac{4}{27}

;
2)

\frac{2 x}{7} + \frac{x}{4} = \frac{15}{14}

;
3)

- \frac{x}{8} + 1 = \frac{x}{12}

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Алгебре 7 класс Мерзляк. Номер №48

\frac{7 x}{6} - \frac{5 x}{18} = \frac{4}{27}

\frac{21 x - 5 x}{18} = \frac{4}{27}

\frac{16}{18} x = \frac{4}{27}

x = \frac{4}{27} : \frac{8}{9}

x = \frac{4}{27} * \frac{9}{8}

x = \frac{1}{3} * \frac{1}{2}

x = \frac{1}{6}

\frac{2 x}{7} + \frac{x}{4} = \frac{15}{14}

\frac{8 x + 7 x}{28} = \frac{15}{14}

\frac{15}{28} x = \frac{15}{14}

x = \frac{15}{14} : \frac{15}{28}

x = \frac{15}{14} * \frac{28}{15}

x = 2

- \frac{x}{8} + 1 = \frac{x}{12}

- \frac{x}{8} - \frac{x}{12} = - 1

\frac{- 3 x - 2 x}{24} = - 1

\frac{- 5}{24} x = - 1

x = - 1 : - \frac{5}{24}

x = \frac{24}{5}

x = 4 \frac{4}{5}

x = 4,8

ГДЗ Алгебра 7 класс Мерзляк, Полонский, Якир