Enrhifo
2\left(\sqrt{2}+\sqrt{7}\right)\approx 8.119929747
Rhannu
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\frac{10\left(\sqrt{7}+\sqrt{2}\right)}{\left(\sqrt{7}-\sqrt{2}\right)\left(\sqrt{7}+\sqrt{2}\right)}
Mae'n rhesymoli enwadur \frac{10}{\sqrt{7}-\sqrt{2}} drwy luosi'r rhifiadur a'r enwadur â \sqrt{7}+\sqrt{2}.
\frac{10\left(\sqrt{7}+\sqrt{2}\right)}{\left(\sqrt{7}\right)^{2}-\left(\sqrt{2}\right)^{2}}
Ystyriwch \left(\sqrt{7}-\sqrt{2}\right)\left(\sqrt{7}+\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{10\left(\sqrt{7}+\sqrt{2}\right)}{7-2}
Sgwâr \sqrt{7}. Sgwâr \sqrt{2}.
\frac{10\left(\sqrt{7}+\sqrt{2}\right)}{5}
Tynnu 2 o 7 i gael 5.
2\left(\sqrt{7}+\sqrt{2}\right)
Rhannu 10\left(\sqrt{7}+\sqrt{2}\right) â 5 i gael 2\left(\sqrt{7}+\sqrt{2}\right).
2\sqrt{7}+2\sqrt{2}
Defnyddio’r briodwedd ddosbarthu i luosi 2 â \sqrt{7}+\sqrt{2}.
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