Выполните деление.
1) $\frac{8}{13} : (-\frac{4}{5})$;
2) $-\frac{5}{14} : (-\frac{15}{28})$;
3) $-\frac{12}{13} : \frac{4}{39}$;
4) $12 : (-\frac{4}{5})$;
5) $\frac{12}{19} : (-6)$;
6) $-1\frac{5}{7} : (-3\frac{3}{4})$.
$\frac{8}{13} : (-\frac{4}{5}) = -(\frac{8}{13} * \frac{5}{4}) = -(\frac{2}{13} * \frac{5}{1}) = -\frac{10}{13}$
$-\frac{5}{14} : (-\frac{15}{28}) = \frac{5}{14} * \frac{28}{15} = \frac{1}{1} * \frac{2}{3} = \frac{2}{3}$
$-\frac{12}{13} : \frac{4}{39} = -(\frac{12}{13} * \frac{39}{4}) = -(\frac{3}{1} * \frac{3}{1}) = -9$
$12 : (-\frac{4}{5}) = -(12 * \frac{5}{4}) = -(3 * \frac{5}{1}) = -15$
$\frac{12}{19} : (-6) = -(\frac{12}{19} * \frac{1}{6}) = -(\frac{2}{19} * \frac{1}{1}) = -\frac{2}{19}$
$-1\frac{5}{7} : (-3\frac{3}{4}) = \frac{12}{7} : \frac{15}{4} = \frac{12}{7} * \frac{4}{15} = \frac{4}{7} * \frac{4}{5} = \frac{16}{35}$
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