Enrhifo
\frac{8\sqrt{6}}{3}\approx 6.531972647
Rhannu
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\frac{8\sqrt{2}}{3}\sqrt{3}
Ffactora 128=8^{2}\times 2. Ailysgrifennu ail isradd y lluoswm \sqrt{8^{2}\times 2} fel lluoswm ail israddau \sqrt{8^{2}}\sqrt{2}. Cymryd isradd 8^{2}.
\frac{8\sqrt{2}\sqrt{3}}{3}
Mynegwch \frac{8\sqrt{2}}{3}\sqrt{3} fel ffracsiwn unigol.
\frac{8\sqrt{6}}{3}
I luosi \sqrt{2} a \sqrt{3}, dylid lluosi'r rhifau dan yr ail isradd.
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