Вычислите:
а) $\frac{34}{45} * \frac{30}{72}$;
б) $\frac{58}{60} : \frac{290}{700}$;
в) $\frac{28}{40} * \frac{140}{84}$;
г) $\frac{15}{24} : \frac{35}{46}$.
$\frac{34}{45} * \frac{30}{72} = \frac{17}{3} * \frac{2}{36} = \frac{17}{3} * \frac{1}{18} = \frac{17}{54}$
$\frac{58}{60} : \frac{290}{700} = \frac{58}{60} * \frac{70}{29} = \frac{2}{6} * \frac{7}{1} = \frac{1}{3} * \frac{7}{1} = \frac{7}{3} = 2\frac{1}{3}$
$\frac{28}{40} * \frac{140}{84} = \frac{1}{2} * \frac{7}{3} = \frac{7}{6} = 1\frac{1}{6}$
$\frac{15}{24} : \frac{35}{46} = \frac{15}{24} * \frac{46}{35} = \frac{3}{12} * \frac{23}{7} = \frac{1}{4} * \frac{23}{7} = \frac{23}{28}$
Пожауйста, оцените решение