Verified answer

а)

[tex] - 6.4 \times ( - \frac{3}{4} x ) \times ( - 1 \frac{1}{3}y) = - 6.4 \times \frac{3}{4} x \times \frac{4}{3}y = - 6.4xy[/tex]

б)

[tex]5.25x \times ( - 1 \frac{1}{7}) \times ( - \frac{5}{36} b) = \frac{21}{4} x \times \frac{8}{7} \times \frac{5}{36} b = 6x \times \frac{5}{36} b = \frac{5}{6} bx[/tex]

в)

[tex] - 0.001x \times ( - 66 \frac{2}{3} ) \times \frac{3}{5} = 0.001x \times \frac{200}{3} \times \frac{3}{5} = 0.001x \times 40 = 0.04x[/tex]

г)

[tex]16 \frac{2}{3} x \times 0.1y \times 9 = \frac{50}{3} x \times \frac{1}{10} y \times 9 = \frac{5}{3} xy \times 9 = 15xy[/tex]