[tex]\it 5\sqrt{72}:\sqrt2-\sqrt6(2\sqrt6-5)-\sqrt{180}=5\sqrt{36} -2\cdot6+5\sqrt6-\sqrt{36\cdot5}=\\ \\ =5\cdot6-12+5\sqrt6-6\sqrt5 =30-12+5\sqrt6-6\sqrt5 =18+5\sqrt6-6\sqrt5.[/tex]
