[tex]=(12-4\sqrt{3}+1)(4+4\sqrt{3}+3)-8\sqrt{20+2\sqrt{27+24\sqrt{3}+16}}
=((2\sqrt{3}-1)(2+\sqrt{3}))^{2}-8\sqrt{20+2(3\sqrt{3}+4)} =43+24\sqrt{3}-8\sqrt{20+6\sqrt{3}+8} =43+24\sqrt{3}-8(3\sqrt{3}+1) =43+24\sqrt{3}-24\sqrt{3}+8=52[/tex]
hay thi like nhé