5/7х(1 1/20-7/30)+16/21:1 1/7 как решить

Ответ:

1.25

Пошаговое объяснение:

$\frac{5}{7} * (\frac{11}{20} - \frac{7}{30}) + \frac{16}{21} : \frac{11}{7} =$ 1.25

1) $\frac {21}{20} - \frac{7}{30} = \frac{63}{60} - \frac{14}{60} = \frac{49}{60}$

2) $\frac{5}{7} * \frac{49}{60} = \frac{1*7}{1*12} = \frac{7}{12}$

3) $\frac{16}{21} : \frac{8}{7} = \frac{16}{21} * \frac{7}{8} = \frac{2*1}{3*1} = \frac{2}{3}$

4) $\frac{7}{12} + \frac{2}{3} = \frac{7}{12} + \frac{8}{12} = \frac{7+8}{12} = \frac{15}{12} = \frac{5}{4} = 1.25$

5/7х(1 1/20-7/30)+16/21:1 1/7 как решить​