Datrys 68-70/frac{51{sqrt{50}}}

$$\frac{ 68-70 }{ \frac{ 51 }{ \sqrt{ 50 } } }$$

Enrhifo

$$-\frac{10\sqrt{2}}{51}\approx -0.277296777$$

Camau Ateb

Tynnu 70 o 68 i gael -2.

$$\frac{-2}{\frac{51}{\sqrt{50}}}$$

Ffactora 50=5^{2}\times 2. Ailysgrifennu ail isradd y lluoswm \sqrt{5^{2}\times 2} fel lluoswm ail israddau \sqrt{5^{2}}\sqrt{2}. Cymryd isradd 5^{2}.

$$\frac{-2}{\frac{51}{5\sqrt{2}}}$$

Mae'n rhesymoli enwadur \frac{51}{5\sqrt{2}} drwy luosi'r rhifiadur a'r enwadur â \sqrt{2}.

$$\frac{-2}{\frac{51\sqrt{2}}{5\left(\sqrt{2}\right)^{2}}}$$

Sgwâr \sqrt{2} yw 2.

$$\frac{-2}{\frac{51\sqrt{2}}{5\times 2}}$$

Lluosi 5 a 2 i gael 10.

$$\frac{-2}{\frac{51\sqrt{2}}{10}}$$

Rhannwch -2 â \frac{51\sqrt{2}}{10} drwy luosi -2 â chilydd \frac{51\sqrt{2}}{10}.

$$\frac{-2\times 10}{51\sqrt{2}}$$

Mae'n rhesymoli enwadur \frac{-2\times 10}{51\sqrt{2}} drwy luosi'r rhifiadur a'r enwadur â \sqrt{2}.

$$\frac{-2\times 10\sqrt{2}}{51\left(\sqrt{2}\right)^{2}}$$

Sgwâr \sqrt{2} yw 2.

$$\frac{-2\times 10\sqrt{2}}{51\times 2}$$

Lluosi -2 a 10 i gael -20.

$$\frac{-20\sqrt{2}}{51\times 2}$$

Lluosi 51 a 2 i gael 102.

$$\frac{-20\sqrt{2}}{102}$$

Rhannu -20\sqrt{2} â 102 i gael -\frac{10}{51}\sqrt{2}.

$$-\frac{10}{51}\sqrt{2}$$