\[\boxed{\mathbf{515\ (515).\ }Еуроки\ - \ ДЗ\ без\ мороки}\]
\[4\sqrt{3} = \sqrt{16 \cdot 3} = \sqrt{48}\]
\[\frac{1}{2}\sqrt{54} = \sqrt{\frac{54}{4}} = \sqrt{13\frac{1}{2}}\]
\[5\sqrt{2} = \sqrt{25 \cdot 2} = \sqrt{50}\]
\[Ответ:\frac{1}{2}\sqrt{54};\sqrt{30};\sqrt{32};\]
\[4\sqrt{3};5\sqrt{2}.\]