Enrhifo
\frac{\sqrt{5}}{5}\approx 0.447213595
Rhannu
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\sqrt{5}-3\times 2\sqrt{5}+\sqrt{125}+\sqrt{\frac{1}{5}}
Ffactora 20=2^{2}\times 5. Ailysgrifennu ail isradd y lluoswm \sqrt{2^{2}\times 5} fel lluoswm ail israddau \sqrt{2^{2}}\sqrt{5}. Cymryd isradd 2^{2}.
\sqrt{5}-6\sqrt{5}+\sqrt{125}+\sqrt{\frac{1}{5}}
Lluosi -3 a 2 i gael -6.
-5\sqrt{5}+\sqrt{125}+\sqrt{\frac{1}{5}}
Cyfuno \sqrt{5} a -6\sqrt{5} i gael -5\sqrt{5}.
-5\sqrt{5}+5\sqrt{5}+\sqrt{\frac{1}{5}}
Ffactora 125=5^{2}\times 5. Ailysgrifennu ail isradd y lluoswm \sqrt{5^{2}\times 5} fel lluoswm ail israddau \sqrt{5^{2}}\sqrt{5}. Cymryd isradd 5^{2}.
\sqrt{\frac{1}{5}}
Cyfuno -5\sqrt{5} a 5\sqrt{5} i gael 0.
\frac{\sqrt{1}}{\sqrt{5}}
Ailysgrifennu ail isradd y rhaniad \sqrt{\frac{1}{5}} fel rhaniad ail israddau \frac{\sqrt{1}}{\sqrt{5}}.
\frac{1}{\sqrt{5}}
Cyfrifo ail isradd 1 a chael 1.
\frac{\sqrt{5}}{\left(\sqrt{5}\right)^{2}}
Mae'n rhesymoli enwadur \frac{1}{\sqrt{5}} drwy luosi'r rhifiadur a'r enwadur â \sqrt{5}.
\frac{\sqrt{5}}{5}
Sgwâr \sqrt{5} yw 5.
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