Enrhifo
\frac{15-5\sqrt{2}}{7}\approx 1.132704598
Rhannu
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\frac{5\left(3-\sqrt{2}\right)}{\left(3+\sqrt{2}\right)\left(3-\sqrt{2}\right)}
Mae'n rhesymoli enwadur \frac{5}{3+\sqrt{2}} drwy luosi'r rhifiadur a'r enwadur â 3-\sqrt{2}.
\frac{5\left(3-\sqrt{2}\right)}{3^{2}-\left(\sqrt{2}\right)^{2}}
Ystyriwch \left(3+\sqrt{2}\right)\left(3-\sqrt{2}\right). Gellir trawsnewid lluosi yn wahaniaeth rhwng sgwariau drwy ddefnyddio’r rheol: \left(a-b\right)\left(a+b\right)=a^{2}-b^{2}.
\frac{5\left(3-\sqrt{2}\right)}{9-2}
Sgwâr 3. Sgwâr \sqrt{2}.
\frac{5\left(3-\sqrt{2}\right)}{7}
Tynnu 2 o 9 i gael 7.
\frac{15-5\sqrt{2}}{7}
Defnyddio’r briodwedd ddosbarthu i luosi 5 â 3-\sqrt{2}.
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