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3\sqrt{5}+3\sqrt{20}-8\sqrt{5}
Tauwehea te 45=3^{2}\times 5. Tuhia anō te pūtake rua o te hua \sqrt{3^{2}\times 5} hei hua o ngā pūtake rua \sqrt{3^{2}}\sqrt{5}. Tuhia te pūtakerua o te 3^{2}.
3\sqrt{5}+3\times 2\sqrt{5}-8\sqrt{5}
Tauwehea te 20=2^{2}\times 5. Tuhia anō te pūtake rua o te hua \sqrt{2^{2}\times 5} hei hua o ngā pūtake rua \sqrt{2^{2}}\sqrt{5}. Tuhia te pūtakerua o te 2^{2}.
3\sqrt{5}+6\sqrt{5}-8\sqrt{5}
Whakareatia te 3 ki te 2, ka 6.
9\sqrt{5}-8\sqrt{5}
Pahekotia te 3\sqrt{5} me 6\sqrt{5}, ka 9\sqrt{5}.
\sqrt{5}
Pahekotia te 9\sqrt{5} me -8\sqrt{5}, ka \sqrt{5}.