По действиям пж помогите

$\frac{\frac{2}{3}-\frac{1}{6}-\frac{4}{9}}{\frac{7}{9}-\frac{5}{12}-\frac{5}{18}}=(\frac{12}{18}-\frac{3}{18}-\frac{8}{18}):(\frac{28}{36}-\frac{15}{36}-\frac{10}{36})=\frac{1}{18}:\frac{3}{36}=\frac{1}{18}*\frac{36}{3}=\frac{1*2}{2*3}=\frac{2}{6}=\frac{1}{3}$

$\frac{8c^{3}}{5d}:\frac{2c^{2}}{15d^{2}}=\frac{8c^{3}}{5d}*\frac{15d^{2}}{2c^{2}}=\frac{8c}{5}*\frac{15d}{2}=\frac{4c}{1}*\frac{3d}{1}=4c*3d=12cd$