Question

Решите пожалуйста))))​

Answer 1

Ответ:

$\frac{5}{7}*(\frac{21}{20} - \frac{7}{30}) + \frac{16}{21} : \frac{8}{7} = \frac{5}{7}*(\frac{63-14}{60}) + \frac{16*7}{21*8} = \frac{5}{7}*\frac{49}{60} + \frac{2}{3} = \frac{7}{12} + \frac{2}{3} = \frac{7+8}{12} = \frac{15}{12} = 1\frac{3}{12} = 1\frac{1}{4} = 1,25$

$\frac{4}{45} : (\frac{12}{25} - \frac{4}{15}) + \frac{15}{16}*\frac{4}{15} = \frac{4}{45} : \frac{36-20}{75} + \frac{15*4}{16*15} = \frac{4}{45} : \frac{16}{75} + \frac{1}{4} = \frac{4*75}{45*16} + \frac{1}{4} = \frac{5}{12} + \frac{1}{4} = \frac{5+3}{12} = \frac{8}{12} = \frac{2}{3}$