Question

Tính 

 

Answer 1

b: \(=\dfrac{\sqrt{3}\left(\sqrt{5}-2\right)}{\sqrt{5}-2}-\dfrac{9\left(6+3\sqrt{3}\right)}{9}+\dfrac{2\sqrt{3}}{3}\)

\(=\sqrt{3}-6-3\sqrt{3}+\dfrac{2}{3}\sqrt{3}\)

\(=-6-\dfrac{4}{3}\sqrt{3}\)