Вычисли значения выражений: 6 1/3 - 8

a) $6\frac{1}{3} - 8 = \frac{19}{3} - 8 = \frac{19 - 24}{3} = -\frac{5}{3} = -1\frac{2}{3}$ б) $-2\frac{2}{7} + 4\frac{1}{3} = -\frac{16}{7} + \frac{13}{3} = \frac{-16 \cdot 3 + 13 \cdot 7}{21} = \frac{-48 + 91}{21} = \frac{43}{21} = 2\frac{1}{21}$ в) $5\frac{1}{3} - 6\frac{1}{4} = \frac{16}{3} - \frac{25}{4} = \frac{16 \cdot 4 - 25 \cdot 3}{12} = \frac{64 - 75}{12} = -\frac{11}{12}$ г) $8 : (-\frac{9}{16}) = 8 \cdot (-\frac{16}{9}) = -\frac{8 \cdot 16}{9} = -\frac{128}{9} = -14\frac{2}{9}$ д) $\frac{5}{12} \cdot (-6) = \frac{5 \cdot (-6)}{12} = \frac{-30}{12} = -\frac{5}{2} = -2\frac{1}{2}$ ж) $\frac{4}{7} \cdot (-49) = \frac{4 \cdot (-49)}{7} = 4 \cdot (-7) = -28$ з) $-16 : (-\frac{4}{9}) = -16 \cdot (-\frac{9}{4}) = \frac{16 \cdot 9}{4} = 4 \cdot 9 = 36$ и) $-3\frac{1}{2} \cdot (-1\frac{3}{7}) = -\frac{7}{2} \cdot (-\frac{10}{7}) = \frac{7 \cdot 10}{2 \cdot 7} = \frac{10}{2} = 5$ *Перевод:* a) $6\frac{1}{3} - 8 = -1\frac{2}{3}$ б) $-2\frac{2}{7} + 4\frac{1}{3} = 2\frac{1}{21}$ в) $5\frac{1}{3} - 6\frac{1}{4} = -\frac{11}{12}$ г) $8 : (-\frac{9}{16}) = -14\frac{2}{9}$ д) $\frac{5}{12} \cdot (-6) = -2\frac{1}{2}$ ж) $\frac{4}{7} \cdot (-49) = -28$ з) $-16 : (-\frac{4}{9}) = 36$ и) $-3\frac{1}{2} \cdot (-1\frac{3}{7}) = 5$