Respostas

2014-08-04T15:19:39-03:00
2 ^{-1} + 6 x (2/3) ^{-2} - (-1/3) ^{-1}

 \frac{1}{2}  + 6 x ( \frac{3}{2} ) x^{2} - (-3)

 \frac{1}{2}  \frac{12}{2} x ( \frac{9}{4} ) + 3

 \frac{1}{2}  \frac{12}{2} x ( \frac{9}{4} ) +  \frac{6}{2}

 \frac{1}{2}  \frac{108}{8}  \frac{6}{2}

 \frac{1}{2}  \frac{27}{2}  \frac{6}{2}  \frac{24}{2} = 12