a)
\sqrt[3]{-\frac{8}{125}}-\sqrt[3]{-2\frac{10}{27}}=-\frac{2}{5}-\sqrt[3]{-\frac{64}{27}}=-\frac{2}{5}-(-\frac{4}{3})=
=-\frac{6}{15}+\frac{20}{15}=\frac{14}{15}
b)
\frac{\sqrt[3]{-9}*\sqrt[3]{-9}}{\sqrt[3]{-3}}-\frac{\sqrt[3]{24}}{\sqrt[3]{-3}}=\frac{\sqrt[3]{81}}{\sqrt[3]{-3}}-\frac{\sqrt[3]{(-8)*(-3)}}{\sqrt[3]{-3}}=
=\sqrt[3]{-27}-\frac{-2\sqrt[3]{-3}}{\sqrt[3]{-3}}=-3+2=-1