Enrhifo
\frac{14\sqrt{5}}{5}\approx 6.260990337
Rhannu
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\frac{2\sqrt{5}}{\left(\sqrt{5}\right)^{2}}+\sqrt{20}+\frac{8}{\sqrt{80}}
Mae'n rhesymoli enwadur \frac{2}{\sqrt{5}} drwy luosi'r rhifiadur a'r enwadur â \sqrt{5}.
\frac{2\sqrt{5}}{5}+\sqrt{20}+\frac{8}{\sqrt{80}}
Sgwâr \sqrt{5} yw 5.
\frac{2\sqrt{5}}{5}+2\sqrt{5}+\frac{8}{\sqrt{80}}
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}.
\frac{12}{5}\sqrt{5}+\frac{8}{\sqrt{80}}
Cyfuno \frac{2\sqrt{5}}{5} a 2\sqrt{5} i gael \frac{12}{5}\sqrt{5}.
\frac{12}{5}\sqrt{5}+\frac{8}{4\sqrt{5}}
Ffactora 80=4^{2}\times 5. Ailysgrifennu ail isradd y lluoswm \sqrt{4^{2}\times 5} fel lluoswm ail israddau \sqrt{4^{2}}\sqrt{5}. Cymryd isradd 4^{2}.
\frac{12}{5}\sqrt{5}+\frac{8\sqrt{5}}{4\left(\sqrt{5}\right)^{2}}
Mae'n rhesymoli enwadur \frac{8}{4\sqrt{5}} drwy luosi'r rhifiadur a'r enwadur â \sqrt{5}.
\frac{12}{5}\sqrt{5}+\frac{8\sqrt{5}}{4\times 5}
Sgwâr \sqrt{5} yw 5.
\frac{12}{5}\sqrt{5}+\frac{2\sqrt{5}}{5}
Canslo 4 yn y rhifiadur a'r enwadur.
\frac{14}{5}\sqrt{5}
Cyfuno \frac{12}{5}\sqrt{5} a \frac{2\sqrt{5}}{5} i gael \frac{14}{5}\sqrt{5}.
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