Datrys 5sqrt{2*8/5}

$$5 \sqrt{ 2 \times \frac{ 8 }{ 5 } }$$

Enrhifo

$$4\sqrt{5}\approx 8.94427191$$

Camau Ateb

Mynegwch 2\times \frac{8}{5} fel ffracsiwn unigol.

$$5\sqrt{\frac{2\times 8}{5}}$$

Lluosi 2 a 8 i gael 16.

$$5\sqrt{\frac{16}{5}}$$

Ailysgrifennu ail isradd y rhaniad \sqrt{\frac{16}{5}} fel rhaniad ail israddau \frac{\sqrt{16}}{\sqrt{5}}.

$$5\times \frac{\sqrt{16}}{\sqrt{5}}$$

Cyfrifo ail isradd 16 a chael 4.

$$5\times \frac{4}{\sqrt{5}}$$

Mae'n rhesymoli enwadur \frac{4}{\sqrt{5}} drwy luosi'r rhifiadur a'r enwadur â \sqrt{5}.

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

Sgwâr \sqrt{5} yw 5.

$$5\times \frac{4\sqrt{5}}{5}$$

Canslo 5 a 5.

$$4\sqrt{5}$$