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12\sqrt{10}
Tauwehea te 1440=12^{2}\times 10. Tuhia anō te pūtake rua o te hua \sqrt{12^{2}\times 10} hei hua o ngā pūtake rua \sqrt{12^{2}}\sqrt{10}. Tuhia te pūtakerua o te 12^{2}.