Datrys (frac{2sqrt{5}}{5})^2

$$( \frac { 2 \sqrt { 5 } } { 5 } ) ^ { 2 }$$

Enrhifo

$$\frac{4}{5}=0.8$$

Camau Ateb

I godi \frac{2\sqrt{5}}{5} i bŵer, codwch y rhifiadur a'r enwadur i bŵer ac yna rhannwch nhw.

$$\frac{\left(2\sqrt{5}\right)^{2}}{5^{2}}$$

Ehangu \left(2\sqrt{5}\right)^{2}.

$$\frac{2^{2}\left(\sqrt{5}\right)^{2}}{5^{2}}$$

Cyfrifo 2 i bŵer 2 a chael 4.

$$\frac{4\left(\sqrt{5}\right)^{2}}{5^{2}}$$

Sgwâr \sqrt{5} yw 5.

$$\frac{4\times 5}{5^{2}}$$

Lluosi 4 a 5 i gael 20.

$$\frac{20}{5^{2}}$$

Cyfrifo 5 i bŵer 2 a chael 25.

$$\frac{20}{25}$$

Lleihau'r ffracsiwn \frac{20}{25} i'r graddau lleiaf posib drwy dynnu a chanslo allan 5.

$$\frac{4}{5}$$

Ffactor

$$\frac{2 ^ {2}}{5} = 0.8$$