Question

Calcule o Valor Da Expressão : (0,666...)Elevado a -2 - (0,222...) Elevado a -1 Me Ajudem Pfv

Answer 1

0,666... = $\frac{6}{9}$ 
0,222... = $\frac{2}{9}$ 

$\frac{6}{9} ^{-2}$ - $\frac{2}{9} ^{-1}$

$( \frac{9}{6} )^{2} - ( \frac{9}{2}) ^{1}$

$\frac{ 9^{2} }{ 6^{2} } - \frac{ 9^{1} }{ 2^{1} }$

$\frac{81}{36} - \frac{9}{2}$

$\frac{81}{36} - \frac{162}{36}$

$- \frac{81}{36}$

$- \frac{9}{4}$