Вычислите:
а)

\frac{2, 8 : 2 \frac{4}{5} * 2 \frac{2}{3}}{1, 6 : 1, 3}

;
б)

\frac{1, 8 : 1 \frac{1}{5} * 0, 12}{0, 27 : \frac{2}{7}}

Вычислите: а) 2 , 8 : 2 4 5 ∗ 2 2 3 1 , 6 : 1 , 3 ; б) 1 , 8 : 1 1 5 ∗ 0 , 12 0 , 27 : 2 7 .

\frac{2, 8 : 2 \frac{4}{5} * 2 \frac{2}{3}}{1, 6 : 1, 3} = \frac{2, 8 : 2, 8 * 2 \frac{2}{3}}{16 : 13} = \frac{2 \frac{2}{3}}{\frac{16}{13}} = \frac{8}{3} * \frac{13}{16} = \frac{1}{3} * \frac{13}{2} = \frac{13}{6} = 2 \frac{1}{6}

\frac{1, 8 : 1 \frac{1}{5} * 0, 12}{0, 27 : \frac{2}{7}} = \frac{1, 8 : 1, 2 * 0, 12}{\frac{27}{100} * \frac{7}{2}} = \frac{18 : 12 * 0, 12}{\frac{189}{200}} = \frac{1, 5 * 0, 12}{\frac{189}{200}} = \frac{0, 18}{\frac{189}{200}} = \frac{18}{100} : \frac{189}{200} = \frac{9}{50} * \frac{200}{189} = \frac{1}{1} * \frac{4}{21} = \frac{4}{21}