Datrys =sqrt{8}-2sin45^circ+(1/2)^-1

$$= \sqrt { 8 } - 2 \sin 45 ^ { \circ } + ( \frac { 1 } { 2 } ) ^ { - 1 }$$

Enrhifo

$$\sqrt{2}+2\approx 3.414213562$$

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}.

$$2\sqrt{2}-2\sin(45)+\left(\frac{1}{2}\right)^{-1}$$

Cael gwerth \sin(45) o’r tabl gwerthoedd trigonometrig.

$$2\sqrt{2}-2\times \frac{\sqrt{2}}{2}+\left(\frac{1}{2}\right)^{-1}$$

Canslo 2 a 2.

$$2\sqrt{2}-\sqrt{2}+\left(\frac{1}{2}\right)^{-1}$$

Cyfuno 2\sqrt{2} a -\sqrt{2} i gael \sqrt{2}.

$$\sqrt{2}+\left(\frac{1}{2}\right)^{-1}$$

Cyfrifo \frac{1}{2} i bŵer -1 a chael 2.

$$\sqrt{2}+2$$