Question

Hãy biểu diễn: \(\sqrt{\dfrac{3+\sqrt{5}}{2}}\) thành \(a+b\sqrt{5}\) với a, b thuộc Q

Answer 1

\(\sqrt{\dfrac{3+\sqrt{5}}{2}}=\sqrt{\dfrac{6+2\sqrt{5}}{2}}=\sqrt{\dfrac{\left(1+\sqrt{5}\right)^2}{2}=\dfrac{1}{2}+\dfrac{\sqrt{5}}{2}}\)

Answer 2

\(\sqrt{\dfrac{3+\sqrt{5}}{2}}=\sqrt{\dfrac{6+2\sqrt{5}}{4}}=\dfrac{\sqrt{5}+1}{2}\)

\(=\dfrac{1}{2}+\dfrac{1}{2}\sqrt{5}\)