[tex]\it \sqrt{20}=\sqrt{\dfrac{100}{5}}=\dfrac{10}{\sqrt5}[/tex]
Expresia din enunț devine:
[tex]\it\dfrac{10}{\sqrt5}+\dfrac{5}{\sqrt{10}}-\dfrac{10}{\sqrt5}=\dfrac{^{\sqrt{10})}5}{\ \ \sqrt{10}}=\dfrac{5\sqrt{10}^{(5}}{10}=\dfrac{\sqrt{10}}{2}[/tex]
