РЕШИТЕ ПРИМЕР!!!!!!!

Решите задачу:

$=\frac{\frac{(\sqrt{a})^{3}+(\sqrt{b})^{3}}{\sqrt{a}+\sqrt{b}} }{a-b}+\frac{2\sqrt{b}}{\sqrt{a}+\sqrt{b}}-\frac{\sqrt{ab} }{a-b} =\frac{\frac{(\sqrt{a}+\sqrt{b})(a-\sqrt{ab}+b)}{\sqrt{a}+\sqrt{b}} }{a-b}+\frac{2\sqrt{b} }{\sqrt{a}+\sqrt{b}}-\frac{\sqrt{ab} }{a-b}=\frac{a-\sqrt{ab}+b }{(\sqrt{a}-\sqrt{b})(\sqrt{a}+\sqrt{b})}+\frac{2\sqrt{b} }{\sqrt{a}+\sqrt{b}}-\frac{\sqrt{ab} }{(\sqrt{a}-\sqrt{b})(\sqrt{a}+\sqrt{b})}=\frac{a-\sqrt{ab}+b+2\sqrt{ab}-2b-\sqrt{ab}}{a-b}=\frac{a-b}{a-b}=1$