Вычислите: 8/9 - 3/8 : 27/28; 16/21 : 12/35 - 2; 35/24 : 15/32 - 3; 2 - 15/28 : 10/21; 18 * 5/81 - 2/3; 24 * 3/64 - 3/4

16. $\frac{8}{9} - \frac{3}{8} : \frac{27}{28} = \frac{8}{9} - \frac{3}{8} \cdot \frac{28}{27} = \frac{8}{9} - \frac{1 \cdot 7}{2 \cdot 9} = \frac{8}{9} - \frac{7}{18} = \frac{16 - 7}{18} = \frac{9}{18} = 0,5$ **Ответ: 0,5** 17. $\frac{16}{21} : \frac{12}{35} - 2 = \frac{16}{21} \cdot \frac{35}{12} - 2 = \frac{4 \cdot 5}{3 \cdot 3} - 2 = \frac{20}{9} - 2 = 2\frac{2}{9} - 2 = \frac{2}{9}$ **Ответ: 2/9** 18. $\frac{35}{24} : \frac{15}{32} - 3 = \frac{35}{24} \cdot \frac{32}{15} - 3 = \frac{7 \cdot 4}{3 \cdot 3} - 3 = \frac{28}{9} - 3 = 3\frac{1}{9} - 3 = \frac{1}{9}$ **Ответ: 1/9** 19. $2 - \frac{15}{28} : \frac{10}{21} = 2 - \frac{15}{28} \cdot \frac{21}{10} = 2 - \frac{3 \cdot 3}{4 \cdot 2} = 2 - \frac{9}{8} = 2 - 1,125 = 0,875$ **Ответ: 0,875** 20. $18 \cdot \frac{5}{81} - \frac{2}{3} = \frac{2 \cdot 5}{9} - \frac{2}{3} = \frac{10}{9} - \frac{6}{9} = \frac{4}{9}$ **Ответ: 4/9** 21. $24 \cdot \frac{3}{64} - \frac{3}{4} = \frac{3 \cdot 3}{8} - \frac{3}{4} = \frac{9}{8} - \frac{6}{8} = \frac{3}{8} = 0,375$ **Ответ: 0,375**