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\frac{1}{2}\times 2\sqrt{10}
Tauwehea te 40=2^{2}\times 10. Tuhia anō te pūtake rua o te hua \sqrt{2^{2}\times 10} hei hua o ngā pūtake rua \sqrt{2^{2}}\sqrt{10}. Tuhia te pūtakerua o te 2^{2}.
\sqrt{10}
Me whakakore te 2 me te 2.