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Tohaina

2\times 9\sqrt{18}
Tātaitia te pūtakerua o 4 kia tae ki 2.
18\sqrt{18}
Whakareatia te 2 ki te 9, ka 18.
18\times 3\sqrt{2}
Tauwehea te 18=3^{2}\times 2. Tuhia anō te pūtake rua o te hua \sqrt{3^{2}\times 2} hei hua o ngā pūtake rua \sqrt{3^{2}}\sqrt{2}. Tuhia te pūtakerua o te 3^{2}.
54\sqrt{2}
Whakareatia te 18 ki te 3, ka 54.