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3\sqrt{21}
Tauwehea te 189=3^{2}\times 21. Tuhia anō te pūtake rua o te hua \sqrt{3^{2}\times 21} hei hua o ngā pūtake rua \sqrt{3^{2}}\sqrt{21}. Tuhia te pūtakerua o te 3^{2}.