Datrys (sqrt{8}*2)-(sqrt{5}-2)

$$( \sqrt{ 8 } \times 2)-( \sqrt{ 5 } -2)$$

Enrhifo

$$4\sqrt{2}+2-\sqrt{5}\approx 5.420786272$$

Camau Ateb

Ffactora 8=2^{2}\times 2. Ailysgrifennu ail isradd y lluoswm \sqrt{2^{2}\times 2} fel lluoswm ail israddau \sqrt{2^{2}}\sqrt{2}. Cymryd isradd 2^{2}.

$$2\times 2\sqrt{2}-\left(\sqrt{5}-2\right)$$

Lluosi 2 a 2 i gael 4.

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

I ddod o hyd i wrthwyneb \sqrt{5}-2, dewch o hyd i wrthwyneb pob term.

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

Gwrthwyneb -2 yw 2.

$$4\sqrt{2}-\sqrt{5}+2$$