Question

Rút gọn: \(A=\sqrt{5}:\dfrac{5}{5+\sqrt{55}}\)

Answer 1

\(A=\dfrac{5\sqrt{5}+5\sqrt{11}}{5}=\sqrt{5}+\sqrt{11}\)

Answer 2

`A=\sqrt{5}:5/[5+\sqrt{55}]`

`A=\sqrt{5}. [5+\sqrt{55}]/5`

`A=[5\sqrt{5}+5\sqrt{11}]/5`

`A=[5(\sqrt{5}+\sqrt{11})]/5=\sqrt{5}+\sqrt{11}`