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3\times 7\sqrt{5}
Tauwehea te 245=7^{2}\times 5. Tuhia anō te pūtake rua o te hua \sqrt{7^{2}\times 5} hei hua o ngā pūtake rua \sqrt{7^{2}}\sqrt{5}. Tuhia te pūtakerua o te 7^{2}.
21\sqrt{5}
Whakareatia te 3 ki te 7, ka 21.