Question

A forma mais simples de escrever ($\frac{ a^{-2} }{b}. \frac{ b^{-3} }{a}$)

Answer 1

$( \frac{a^{-2}}{b} * \frac{b^{-3}}{a} )~\to~ \frac{a^{-2}*b^{-3}}{a*b}~=~a^{-3} *b^{-4}$