Respostas

2013-10-08T13:37:14-03:00
 x^{4-16}
 x^{-12}
 \frac{1}{x ^{12} }


8a² + 24ab + 18b²
2(4a² + 12ab + 9b²)

1 5 1
2013-10-08T13:42:51-03:00
 x^{4-16}= x^{4} x^{-16}= x^{-12}

Se trata de um quadrado perfeito, logo...

 (a\sqrt{8}+b \sqrt{18}) ^{2}