Question

giải chi tiết với ạ

Answer 1

\(B=\sqrt{7+4\sqrt{3}-2\sqrt{3}}\)

\(=\sqrt{2^2+2.2.\sqrt{3}+\left(\sqrt{3}\right)^2}-2\sqrt{3}\)

\(=\sqrt{\left(2+\sqrt{3}\right)^2}-2\sqrt{3}=2+\sqrt{3}-2\sqrt{3}=2-\sqrt{3}\)