Вычислите:
а) $17 : (\frac{3}{5} + \frac{1}{4}) + (\frac{7}{8} - \frac{1}{4}) * (\frac{4}{5})^2$;
б) $70 : (\frac{5}{8} + \frac{5}{6}) + (3\frac{1}{9} - \frac{1}{3}) * (\frac{3}{10})^2$.
$17 : (\frac{3}{5} + \frac{1}{4}) + (\frac{7}{8} - \frac{1}{4}) * (\frac{4}{5})^2 = 17 : \frac{12 + 5}{20} + \frac{7 - 2}{8} * \frac{16}{25} = 17 : \frac{17}{20} + \frac{5}{8} * \frac{16}{25} = 17 * \frac{20}{17} + \frac{1}{1} * \frac{2}{5} = 20 + \frac{2}{5} = 20\frac{2}{5}$
$70 : (\frac{5}{8} + \frac{5}{6}) + (3\frac{1}{9} - \frac{1}{3}) * (\frac{3}{10})^2 = 70 : \frac{15 + 20}{24} + (\frac{28}{9} - \frac{3}{9}) * \frac{9}{100} = 70 : \frac{35}{24} + \frac{25}{9} * \frac{9}{100} = 70 * \frac{24}{35} + \frac{1}{1} * \frac{1}{4} = 2 * 24 + \frac{1}{4} = 48\frac{1}{4}$
Пожауйста, оцените решение
