Question

Chứng minh rằng \(\sqrt {4 + 2\sqrt 3 }  - \sqrt {4 - 2\sqrt 3 }  = 2.\)

Answer 1

\(VT=\sqrt{\left(\sqrt{3}+1\right)^2}-\sqrt{\left(\sqrt{3}-1\right)^2}\)

\(=\sqrt{3}+1-\sqrt{3}+1\)

=2=VP