Найдите значение выражения:
а) $\frac{5}{14} * 1\frac{24}{25} : \frac{7}{12} : 7\frac{1}{5} * 2\frac{7}{10}$;
б) $31\frac{4}{11} : \frac{5}{184} : 138$;
в) $38\frac{19}{80} : 231\frac{4}{5}$;
г) $8\frac{6}{57} : 12\frac{3}{19}$.
$\frac{5}{14} * 1\frac{24}{25} : \frac{7}{12} : 7\frac{1}{5} * 2\frac{7}{10} = \frac{5}{14} * \frac{49}{25} * \frac{12}{7} : \frac{36}{5} * \frac{27}{10} = \frac{5}{14} * \frac{49}{25} * \frac{12}{7} * \frac{5}{36} * \frac{27}{10} = \frac{1}{1} * \frac{1}{1} * \frac{1}{1} * \frac{1}{2} * \frac{9}{10} = \frac{9}{20}$
$31\frac{4}{11} : \frac{5}{184} : 138 = \frac{345}{11} * \frac{184}{5} * \frac{1}{138} = \frac{1}{11} * \frac{92}{1} * \frac{1}{1} = \frac{92}{11} = 8\frac{4}{11}$
$38\frac{19}{80} : 231\frac{4}{5} = \frac{3059}{80} : \frac{1159}{5} = \frac{3059}{80} * \frac{5}{1159} = \frac{7 * 19 * 23 * 5}{2 * 2 * 2 * 2 * 5 * 19 * 61} = \frac{7 * 23}{2 * 2 * 2 * 2 * 61} = \frac{161}{976}$
$8\frac{6}{57} : 12\frac{3}{19} = \frac{462}{57} : \frac{231}{19} = \frac{462}{57} * \frac{19}{231} = \frac{2}{3} * \frac{1}{1} = \frac{2}{3}$
Пожауйста, оцените решение