Question

Giải giúp vs ạ

Answer 1

a: Ta có: \(\sqrt{45}-10\sqrt{\dfrac{1}{5}}+\sqrt{\left(1-\sqrt{5}\right)^2}\)

\(=3\sqrt{5}-2\sqrt{5}+\sqrt{5}-1\)

\(=2\sqrt{5}-1\)

d: \(\sqrt{11-4\sqrt{7}}+\dfrac{3}{2-\sqrt{7}}+\dfrac{2+\sqrt{2}}{1+\sqrt{2}}\)

\(=\sqrt{7}-2-2-\sqrt{7}+\sqrt{2}\)

\(=-4+\sqrt{2}\)