Вычислите:
а) $\frac{5}{12} : \frac{3}{8}$;
б) $(-\frac{15}{31}) : \frac{1}{2}$;
в) $\frac{51}{60} : (-\frac{17}{20})$;
г) $-\frac{47}{40} : (-\frac{3}{4})$.
$\frac{5}{12} : \frac{3}{8} = \frac{5}{12} * \frac{8}{3} = \frac{5}{3} * \frac{2}{3} = \frac{10}{9} = 1\frac{1}{9}$
$(-\frac{15}{31}) : \frac{1}{2} = (-\frac{15}{31}) * \frac{2}{1} = -\frac{30}{31}$
$\frac{51}{60} : (-\frac{17}{20}) = \frac{51}{60} * (-\frac{20}{17}) = \frac{3}{3} * (-\frac{1}{1}) = -1$
$-\frac{47}{40} : (-\frac{3}{4}) = \frac{47}{40} * \frac{4}{3} = \frac{47}{10} * \frac{1}{3} = \frac{47}{30} = 1\frac{17}{30}$
Пожауйста, оцените решение
