1)
[tex]\it \ell_a=\dfrac{2bc}{b+c}cos\dfrac{A}{2} = \dfrac{2\cdot\sqrt2\cdot\sqrt3}{\sqrt2+\sqrt3} cos\dfrac{\pi}{6} =\dfrac{2\cdot\sqrt2\cdot\sqrt3}{\sqrt3+\sqrt2}\cdot\dfrac{\sqrt3}{2}=\dfrac{^{\sqrt3-\sqrt2)}3\sqrt2}{\ \ \sqrt3+\sqrt2}=\\ \\ \\ =\dfrac{3\sqrt6-6}{1}=3\sqrt6-6[/tex]