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20\sqrt{30}
Tauwehea te 12000=20^{2}\times 30. Tuhia anō te pūtake rua o te hua \sqrt{20^{2}\times 30} hei hua o ngā pūtake rua \sqrt{20^{2}}\sqrt{30}. Tuhia te pūtakerua o te 20^{2}.