Aromātai
\frac{4\sqrt{5}}{5}\approx 1.788854382
Tohaina
Kua tāruatia ki te papatopenga
\frac{8}{\sqrt{20}}
Whakareatia te 2 ki te 4, ka 8.
\frac{8}{2\sqrt{5}}
Tauwehea te 20=2^{2}\times 5. Tuhia anō te pūtake rua o te hua \sqrt{2^{2}\times 5} hei hua o ngā pūtake rua \sqrt{2^{2}}\sqrt{5}. Tuhia te pūtakerua o te 2^{2}.
\frac{8\sqrt{5}}{2\left(\sqrt{5}\right)^{2}}
Whakangāwaritia te tauraro o \frac{8}{2\sqrt{5}} mā te whakarea i te taurunga me te tauraro ki te \sqrt{5}.
\frac{8\sqrt{5}}{2\times 5}
Ko te pūrua o \sqrt{5} ko 5.
\frac{4\sqrt{5}}{5}
Me whakakore tahi te 2 i te taurunga me te tauraro.
Ngā Tauira
whārite tapawhā
{ x } ^ { 2 } - 4 x - 5 = 0
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