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2\times 5\sqrt{10}
Tauwehea te 250=5^{2}\times 10. Tuhia anō te pūtake rua o te hua \sqrt{5^{2}\times 10} hei hua o ngā pūtake rua \sqrt{5^{2}}\sqrt{10}. Tuhia te pūtakerua o te 5^{2}.
10\sqrt{10}
Whakareatia te 2 ki te 5, ka 10.