Datrys (6^-1-8^-1)+(2-(3^-1)^2)?

$$( 6 ^ { - 1 } - 8 ^ { - 1 } ) + ( 2 - ( 3 ^ { - 1 } ) ^ { 2 } ) ?$$

Enrhifo

$$\frac{139}{72}\approx 1.930555556$$

Camau Ateb

I godi pŵer rhif i bŵer arall, lluoswch yr esbonyddion. Lluoswch -1 a 2 i gael -2.

$$6^{-1}-8^{-1}+2-3^{-2}$$

Cyfrifo 6 i bŵer -1 a chael \frac{1}{6}.

$$\frac{1}{6}-8^{-1}+2-3^{-2}$$

Cyfrifo 8 i bŵer -1 a chael \frac{1}{8}.

$$\frac{1}{6}-\frac{1}{8}+2-3^{-2}$$

Tynnu \frac{1}{8} o \frac{1}{6} i gael \frac{1}{24}.

$$\frac{1}{24}+2-3^{-2}$$

Cyfrifo 3 i bŵer -2 a chael \frac{1}{9}.

$$\frac{1}{24}+2-\frac{1}{9}$$

Tynnu \frac{1}{9} o 2 i gael \frac{17}{9}.

$$\frac{1}{24}+\frac{17}{9}$$

Adio \frac{1}{24} a \frac{17}{9} i gael \frac{139}{72}.

$$\frac{139}{72}$$

Ffactor

$$\frac{139}{2 ^ {3} \cdot 3 ^ {2}} = 1\frac{67}{72} = 1.9305555555555556$$