Enrhifo
\sqrt{10}\approx 3.16227766
Rhannu
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5\times \frac{\sqrt{2}}{\sqrt{5}}
Ailysgrifennu ail isradd y rhaniad \sqrt{\frac{2}{5}} fel rhaniad ail israddau \frac{\sqrt{2}}{\sqrt{5}}.
5\times \frac{\sqrt{2}\sqrt{5}}{\left(\sqrt{5}\right)^{2}}
Mae'n rhesymoli enwadur \frac{\sqrt{2}}{\sqrt{5}} drwy luosi'r rhifiadur a'r enwadur â \sqrt{5}.
5\times \frac{\sqrt{2}\sqrt{5}}{5}
Sgwâr \sqrt{5} yw 5.
5\times \frac{\sqrt{10}}{5}
I luosi \sqrt{2} a \sqrt{5}, dylid lluosi'r rhifau dan yr ail isradd.
\sqrt{10}
Canslo 5 a 5.
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