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40\sqrt{5}
Tauwehea te 8000=40^{2}\times 5. Tuhia anō te pūtake rua o te hua \sqrt{40^{2}\times 5} hei hua o ngā pūtake rua \sqrt{40^{2}}\sqrt{5}. Tuhia te pūtakerua o te 40^{2}.