Найдите значение выражения:
а) $\frac{21}{25} * \frac{5}{7} - \frac{3}{16} * \frac{4}{15}$;
б) $5\frac{5}{12} * \frac{4}{13} - 2\frac{5}{8} * \frac{3}{14}$;
в) $15\frac{2}{5} * 1\frac{5}{7} + 6\frac{10}{27} * 3\frac{3}{8}$;
г) $15\frac{4}{7} - 4\frac{3}{8} * (1\frac{3}{7} - \frac{34}{35})$;
д) $(\frac{3}{4})^3$;
е) $(\frac{5}{6})^2$.
$\frac{21}{25} * \frac{5}{7} - \frac{3}{16} * \frac{4}{15} = \frac{3}{5} * \frac{1}{1} - \frac{1}{4} * \frac{1}{5} = \frac{3}{5} - \frac{1}{20} = \frac{12}{20} - \frac{1}{20} = \frac{11}{20}$
$5\frac{5}{12} * \frac{4}{13} - 2\frac{5}{8} * \frac{3}{14} = \frac{65}{12} * \frac{4}{13} - \frac{21}{8} * \frac{3}{14} = \frac{5}{3} * \frac{1}{1} - \frac{3}{8} * \frac{3}{2} = \frac{5}{3} - \frac{9}{16} = \frac{80}{48} - \frac{27}{48} = \frac{53}{48} = 1\frac{5}{48}$
$15\frac{2}{5} * 1\frac{5}{7} + 6\frac{10}{27} * 3\frac{3}{8} = \frac{77}{5} * \frac{12}{7} + \frac{172}{27} * \frac{27}{8} = \frac{11}{5} * \frac{12}{1} + \frac{43}{1} * \frac{1}{2} = \frac{132}{5} + \frac{43}{2} = 26\frac{2}{5} + 21\frac{1}{2} = 26\frac{4}{10} + 21\frac{5}{10} = 47\frac{9}{10}$
$15\frac{4}{7} - 4\frac{3}{8} * (1\frac{3}{7} - \frac{34}{35}) = 15\frac{4}{7} - \frac{35}{8} * (\frac{50}{35} - \frac{34}{35}) = 15\frac{4}{7} - \frac{35}{8} * \frac{16}{35} = 15\frac{4}{7} - \frac{1}{1} * \frac{2}{1} = 15\frac{4}{7} - 2 = 13\frac{4}{7}$
$(\frac{3}{4})^3 = \frac{3}{4} * \frac{3}{4} * \frac{3}{4} = \frac{27}{64}$
$(\frac{5}{6})^2 = \frac{5}{6} * \frac{5}{6} = \frac{25}{36}$
Пожауйста, оцените решение
