Enrhifo
\sqrt{7}+2\sqrt{3}\approx 6.109852926
Rhannu
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3\sqrt{7}+\sqrt{12}-\sqrt{28}
Ffactora 63=3^{2}\times 7. Ailysgrifennu ail isradd y lluoswm \sqrt{3^{2}\times 7} fel lluoswm ail israddau \sqrt{3^{2}}\sqrt{7}. Cymryd isradd 3^{2}.
3\sqrt{7}+2\sqrt{3}-\sqrt{28}
Ffactora 12=2^{2}\times 3. Ailysgrifennu ail isradd y lluoswm \sqrt{2^{2}\times 3} fel lluoswm ail israddau \sqrt{2^{2}}\sqrt{3}. Cymryd isradd 2^{2}.
3\sqrt{7}+2\sqrt{3}-2\sqrt{7}
Ffactora 28=2^{2}\times 7. Ailysgrifennu ail isradd y lluoswm \sqrt{2^{2}\times 7} fel lluoswm ail israddau \sqrt{2^{2}}\sqrt{7}. Cymryd isradd 2^{2}.
\sqrt{7}+2\sqrt{3}
Cyfuno 3\sqrt{7} a -2\sqrt{7} i gael \sqrt{7}.
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