7: \(=\sqrt{6}-\sqrt{6}-1+\dfrac{2}{\sqrt{5}+1}+\sqrt{\dfrac{1+\sqrt{5}}{2}}\)
\(=\dfrac{-\sqrt{5}+1+2}{\sqrt{5}+1}+\dfrac{\sqrt{2+2\sqrt{5}}}{2}\)
\(=\dfrac{-4+2\sqrt{5}+\sqrt{2\sqrt{5}+2}}{2}\)
Đúng 0
Bình luận (0)