5. Вычислите:

5. Вычислите: а) $6\frac{1}{3} - 8 = -1\frac{2}{3}$ б) $-2\frac{2}{7} + 4\frac{3}{5} = -\frac{16}{7} + \frac{23}{5} = \frac{-80+161}{35} = \frac{81}{35} = 2\frac{11}{35}$ в) $5\frac{1}{3} - 6\frac{1}{4} = \frac{16}{3} - \frac{25}{4} = \frac{64-75}{12} = -\frac{11}{12}$ г) $\frac{3}{8} : (-\frac{9}{16}) = \frac{3}{8} \cdot (-\frac{16}{9}) = -\frac{1 \cdot 2}{1 \cdot 3} = -\frac{2}{3}$ д) $\frac{5}{12} \cdot (-6) = -\frac{5 \cdot 6}{12} = -\frac{5}{2} = -2,5$ е) $-3\frac{2}{9} \cdot 3 = -\frac{29}{9} \cdot 3 = -\frac{29}{3} = -9\frac{2}{3}$ ж) $\frac{4}{7} \cdot (-49) = -\frac{4 \cdot 49}{7} = -4 \cdot 7 = -28$ з) $16 : \frac{4}{9} = 16 \cdot \frac{9}{4} = 4 \cdot 9 = 36$ и) $3\frac{1}{2} \cdot 1\frac{3}{7} = \frac{7}{2} \cdot \frac{10}{7} = 5 6. Выполните действия: а) $8\frac{1}{3} + 6\frac{1}{2} - 3\frac{5}{6} = \frac{25}{3} + \frac{13}{2} - \frac{23}{6} = \frac{50+39-23}{6} = \frac{66}{6} = 11$ б) $12\frac{3}{8} - 5\frac{1}{4} + 7\frac{1}{2} = \frac{99}{8} - \frac{21}{4} + \frac{15}{2} = \frac{99-42+60}{8} = \frac{117}{8} = 14\frac{5}{8}$ в) $2\frac{1}{3} \cdot 1\frac{3}{10} : 2\frac{4}{5} = \frac{7}{3} \cdot \frac{13}{10} : \frac{14}{5} = \frac{91}{30} \cdot \frac{5}{14} = \frac{13 \cdot 1}{6 \cdot 2} = \frac{13}{12} = 1\frac{1}{12}$ г) $1\frac{1}{6} : 2\frac{1}{6} \cdot 26 = \frac{7}{6} : \frac{13}{6} \cdot 26 = \frac{7}{6} \cdot \frac{6}{13} \cdot 26 = \frac{7 \cdot 26}{13} = 7 \cdot 2 = 14 7. Найдите значение выражения: а) $3\frac{3}{5} \cdot \frac{4}{9} : 2 = \frac{18}{5} \cdot \frac{4}{9} : 2 = \frac{2 \cdot 4}{5} : 2 = \frac{8}{5} : 2 = \frac{4}{5} = 0,8$