Enrhifo
0
Ffactor
0
Rhannu
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3\sqrt{7}-\sqrt{28}-\sqrt{7}
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{7}-\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}-\sqrt{7}
Cyfuno 3\sqrt{7} a -2\sqrt{7} i gael \sqrt{7}.
0
Cyfuno \sqrt{7} a -\sqrt{7} i gael 0.
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