[tex]\left[\frac{\left(a^{\frac{3}{4}}-b^{\frac{3}{4}}\right)\left(a^{\frac{3}{4}}+b^{\frac{3}{4}}\right)}{\sqrt{a}-\sqrt{b}}-\sqrt{ab}\right]\cdot \frac{2\sqrt{2,\:5}\left(a+b\right)^{-2}}{\sqrt{10}}[/tex]