Question

На изображении. Дроби​

Answer 1

1) $(\frac{3}{4} + \frac{1}{20}) = \frac{15+1}{20} = \frac{16}{20} * \frac{1}{2} = \frac{8}{20} * \frac{1}{1} = \frac{8}{20}$

2) $(\frac{7}{12} - \frac{1}{3}) * \frac{16}{19} = \frac{7+4}{12} = \frac{11}{12} * \frac{16}{19} = \frac{11}{3} * \frac{4}{19} = \frac{44}{57}$