Найдите значение выражения:
1) $(-\frac{4}{15} + \frac{5}{9}) : (-\frac{26}{45})$;
2) $-12 : (-2\frac{1}{13}) + 1\frac{1}{4} : (-\frac{15}{46})$;
3) $(-3\frac{3}{10} - 1\frac{8}{15}) : (-1\frac{2}{27})$;
4) $(\frac{9}{20} - \frac{7}{8}) : (-\frac{7}{45} - \frac{2}{9})$.
$(-\frac{4}{15} + \frac{5}{9}) : (-\frac{26}{45}) = (-\frac{12}{45} + \frac{25}{45}) * (-\frac{45}{26}) = \frac{13}{45} * (-\frac{45}{26}) = \frac{1}{1} * (-\frac{1}{2}) = -\frac{1}{2}$
$-12 : (-2\frac{1}{13}) + 1\frac{1}{4} : (-\frac{15}{46}) = -12 : (-\frac{27}{13}) + \frac{5}{4} : (-\frac{15}{46}) = -12 * (-\frac{13}{27}) + \frac{5}{4} * (-\frac{46}{15}) = -4 * (-\frac{13}{9}) + \frac{1}{2} * (-\frac{23}{3}) = \frac{52}{9} - \frac{23}{6} = \frac{104}{18} - \frac{69}{18} = \frac{35}{18} = 1\frac{17}{18}$
$(-3\frac{3}{10} - 1\frac{8}{15}) : (-1\frac{2}{27}) = (-3\frac{9}{30} - 1\frac{16}{30}) : (-\frac{29}{27}) = -4\frac{5}{6} * (-\frac{27}{29}) = -\frac{29}{6} * (-\frac{27}{29}) = -\frac{1}{2} * (-\frac{9}{1}) = \frac{9}{2} = 4\frac{1}{2}$
$(\frac{9}{20} - \frac{7}{8}) : (-\frac{7}{45} - \frac{2}{9}) = (\frac{18}{40} - \frac{35}{40}) : (-\frac{7}{45} - \frac{10}{45}) = -\frac{17}{40} : (-\frac{17}{45}) = -\frac{17}{40} * (-\frac{45}{17}) = -\frac{1}{8} * (-\frac{9}{1}) = \frac{9}{8} = 1\frac{1}{8}$
Пожауйста, оцените решение
