Вычисли выражения: a) 6 1/3 - 8

a) $6\frac{1}{3}-8= \frac{19}{3} -8 = \frac{19}{3} - \frac{24}{3}= -\frac{5}{3}= -1\frac{2}{3}$ б) $-2\frac{4}{7}+5\frac{2}{3}= -\frac{18}{7}+\frac{17}{3}= \frac{-18*3 + 17*7}{21}= \frac{-54+119}{21}=\frac{65}{21}= 3\frac{2}{21}$ в) $5\frac{1}{3}-6\frac{1}{4}= \frac{16}{3} - \frac{25}{4}= \frac{16*4 - 25*3}{12} = \frac{64-75}{12}= -\frac{11}{12}$ г) $8\frac{1}{3} : (-\frac{16}{9})= \frac{25}{3} : (-\frac{16}{9})= \frac{25}{3} * (-\frac{9}{16})= -\frac{25*3}{16}= -\frac{75}{16}= -4\frac{11}{16}$ д) $-3:2\frac{3}{9}= -3 : \frac{21}{9}= -3 * \frac{9}{21}= -\frac{3*3}{7}= -\frac{9}{7}= -1\frac{2}{7}$ ж) $4\frac{4}{7} * (-49)= \frac{32}{7} * (-49)= 32 * (-7)= -224$ з) $-16 : (-\frac{4}{9})= 16 * \frac{9}{4}= 4*9 =36$ и) $-3\frac{1}{2} * (-1\frac{3}{7})= -\frac{7}{2} * (-\frac{10}{7})= \frac{10}{2}=5$ *Перевод:* a) $6\frac{1}{3}-8= \frac{19}{3} -8 = \frac{19}{3} - \frac{24}{3}= -\frac{5}{3}= -1\frac{2}{3}$ б) $-2\frac{4}{7}+5\frac{2}{3}= -\frac{18}{7}+\frac{17}{3}= \frac{-18*3 + 17*7}{21}= \frac{-54+119}{21}=\frac{65}{21}= 3\frac{2}{21}$ в) $5\frac{1}{3}-6\frac{1}{4}= \frac{16}{3} - \frac{25}{4}= \frac{16*4 - 25*3}{12} = \frac{64-75}{12}= -\frac{11}{12}$ г) $8\frac{1}{3} : (-\frac{16}{9})= \frac{25}{3} : (-\frac{16}{9})= \frac{25}{3} * (-\frac{9}{16})= -\frac{25*3}{16}= -\frac{75}{16}= -4\frac{11}{16}$ д) $-3:2\frac{3}{9}= -3 : \frac{21}{9}= -3 * \frac{9}{21}= -\frac{3*3}{7}= -\frac{9}{7}= -1\frac{2}{7}$ ж) $4\frac{4}{7} * (-49)= \frac{32}{7} * (-49)= 32 * (-7)= -224$ з) $-16 : (-\frac{4}{9})= 16 * \frac{9}{4}= 4*9 =36$ и) $-3\frac{1}{2} * (-1\frac{3}{7})= -\frac{7}{2} * (-\frac{10}{7})= \frac{10}{2}=5