\[\boxed{\mathbf{500}.}\]
\[1)\ \frac{a^{\frac{5}{3}}}{\sqrt[3]{a} + \sqrt[3]{b}} - \frac{a^{\frac{4}{3}}b^{\frac{1}{3}}}{\sqrt[3]{b} - \sqrt[3]{a}} -\]
\[- \frac{2a^{2}}{\sqrt[3]{a^{2}} - \sqrt[3]{b^{2}}} =\]