sederhanakanlah 2 per akar 20

semoga membantu yaa :)

[tex]\frac{2}{ \sqrt{20} } = \frac{2}{ \sqrt{20} } X \frac{ \sqrt{20} }{ \sqrt{20} } = \frac{2}{20} \sqrt{20} = \frac{1}{10} \sqrt{20} [/tex]