\(A=8+4\sqrt{3}=4\left(2+\sqrt{3}\right)\)
\(B=\sqrt{6}+\sqrt{2}=\left(\sqrt{6}+2\sqrt{2}\right)-\sqrt{2}=\sqrt{2}\left(2+\sqrt{3}\right)-\sqrt{2}\)
Ta có : \(2\left(2+\sqrt{3}\right)< 4\left(2+\sqrt{3}\right)\)
\(\Rightarrow2\left(2+\sqrt{3}\right)-\sqrt{2}< 4\left(2+\sqrt{3}\right)\)
=> B < A