Enrhifo
-11\sqrt{5}\approx -24.596747752
Rhannu
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9\sqrt{5}+10\times 3\sqrt{5}-10\sqrt{125}
Ffactora 45=3^{2}\times 5. Ailysgrifennu ail isradd y lluoswm \sqrt{3^{2}\times 5} fel lluoswm ail israddau \sqrt{3^{2}}\sqrt{5}. Cymryd isradd 3^{2}.
9\sqrt{5}+30\sqrt{5}-10\sqrt{125}
Lluosi 10 a 3 i gael 30.
39\sqrt{5}-10\sqrt{125}
Cyfuno 9\sqrt{5} a 30\sqrt{5} i gael 39\sqrt{5}.
39\sqrt{5}-10\times 5\sqrt{5}
Ffactora 125=5^{2}\times 5. Ailysgrifennu ail isradd y lluoswm \sqrt{5^{2}\times 5} fel lluoswm ail israddau \sqrt{5^{2}}\sqrt{5}. Cymryd isradd 5^{2}.
39\sqrt{5}-50\sqrt{5}
Lluosi -10 a 5 i gael -50.
-11\sqrt{5}
Cyfuno 39\sqrt{5} a -50\sqrt{5} i gael -11\sqrt{5}.
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