$2\frac{1}{4} - 1\frac{1}{4} * (\frac{2}{7} + 3\frac{1}{7} * \frac{1}{3}) : 0,7 = \frac{5}{6}$
1 действие:
$3\frac{1}{7} * \frac{1}{3} = \frac{22}{7} * \frac{1}{3} = \frac{22}{21}$
2 действие:
$\frac{2}{7} + \frac{22}{21} = \frac{6 + 22}{21} = \frac{28}{21} = \frac{4}{3}$
3 действие:
$1\frac{1}{4} * \frac{4}{3} = \frac{5}{4} * \frac{4}{3} = \frac{5}{1} * \frac{1}{3} = \frac{5}{3} = 1\frac{2}{3}$
4 действие:
$2\frac{1}{4} - 1\frac{2}{3} = 2\frac{3}{12} - 1\frac{8}{12} = 1\frac{15}{12} - 1\frac{8}{12} = \frac{7}{12}$
5 действие:
$\frac{7}{12} : 0,7 = \frac{7}{12} : \frac{7}{10} = \frac{7}{12} * \frac{10}{7} = \frac{1}{6} * \frac{5}{1} = \frac{5}{6}$