Bài 1:
a: Ta có: \(A=\sqrt{\left(4-\sqrt{5}\right)^2}+\sqrt{\left(1-\sqrt{5}\right)^2}\)
\(=4-\sqrt{5}+\sqrt{5}-1\)
=3
b: Ta có: \(B=\sqrt{7+\sqrt{33}}+\sqrt{7-\sqrt{33}}\)
\(=\dfrac{\sqrt{14+2\sqrt{33}}+\sqrt{14-2\sqrt{33}}}{\sqrt{2}}\)
\(=\dfrac{\sqrt{11}+\sqrt{3}+\sqrt{11}-\sqrt{3}}{\sqrt{2}}\)
\(=\sqrt{22}\)