a) -0,7 * 3,2 = -2,24
б) -\frac{6}{7} * (-2\frac{13}{18}) = -\frac{6}{7} * (-\frac{49}{18}) = \frac{6}{7} * \frac{49}{18} = \frac{6*49}{7*18} = \frac{1*7}{1*3} = \frac{7}{3} = 2\frac{1}{3}
в) -3\frac{5}{9} : (-2\frac{2}{3}) = -\frac{32}{9} : (-\frac{8}{3}) = \frac{32}{9} * \frac{3}{8} = \frac{32*3}{9*8} = \frac{4*1}{3*1} = \frac{4}{3} = 1\frac{1}{3}