Вычислите:
а) $\frac{3}{5} + \frac{3}{7} + \frac{9}{7} * \frac{4}{15}$;
б) $(\frac{7}{9} - \frac{1}{6}) : \frac{2}{9} * \frac{21}{22}$;
в) $\frac{7}{8} + \frac{5}{8} * \frac{1}{3} + \frac{2}{3}$;
г) $(\frac{1}{6} + \frac{3}{14}) : (\frac{5}{21} - \frac{1}{14})$.
$\frac{3}{5} + \frac{3}{7} + \frac{9}{7} * \frac{4}{15} = \frac{21 + 15}{35} + \frac{3}{7} * \frac{4}{5} = \frac{36}{35} + \frac{12}{35} = \frac{48}{35} = 1\frac{13}{35}$
$(\frac{7}{9} - \frac{1}{6}) : \frac{2}{9} * \frac{21}{22} = \frac{14 - 3}{18} : \frac{2}{9} * \frac{21}{22} = \frac{11}{18} * \frac{9}{2} * \frac{21}{22} = \frac{1}{2} * \frac{1}{2} * \frac{21}{2} = \frac{21}{8} = 2\frac{5}{8}$
$\frac{7}{8} + \frac{5}{8} * \frac{1}{3} + \frac{2}{3} = \frac{7}{8} + \frac{5}{24} + \frac{2}{3} = \frac{21 + 5 + 16}{24} = \frac{42}{24} = \frac{7}{4} = 1\frac{3}{4}$
$(\frac{1}{6} + \frac{3}{14}) : (\frac{5}{21} - \frac{1}{14}) = \frac{7 + 9}{42} : \frac{10 - 3}{42} = \frac{16}{42} * \frac{42}{7} = \frac{16}{7} = 2\frac{2}{7}$
Пожауйста, оцените решение
