Datrys (1.2-4/5)^-2+sqrt{25/16}-2^-1=

$$( 1.2 - \frac { 4 } { 5 } ) ^ { - 2 } + \sqrt { \frac { 25 } { 16 } } - 2 ^ { - 1 } =$$

Enrhifo

$$7$$

Camau Ateb

Tynnu \frac{4}{5} o 1.2 i gael \frac{2}{5}.

$$\left(\frac{2}{5}\right)^{-2}+\sqrt{\frac{25}{16}}-2^{-1}$$

Cyfrifo \frac{2}{5} i bŵer -2 a chael \frac{25}{4}.

$$\frac{25}{4}+\sqrt{\frac{25}{16}}-2^{-1}$$

Ailysgrifennu ail isradd y rhaniad \frac{25}{16} fel rhaniad ail israddau \frac{\sqrt{25}}{\sqrt{16}}. Cymryd ail isradd y rhifiadur a'r enwadur.

$$\frac{25}{4}+\frac{5}{4}-2^{-1}$$

Adio \frac{25}{4} a \frac{5}{4} i gael \frac{15}{2}.

$$\frac{15}{2}-2^{-1}$$

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

$$\frac{15}{2}-\frac{1}{2}$$

Tynnu \frac{1}{2} o \frac{15}{2} i gael 7.

$$7$$

Ffactor

$$7$$