![\bf ~\hspace{7em}\textit{negative exponents} \\\\ a^{-n} \implies \cfrac{1}{a^n} ~\hspace{4.5em} a^n\implies \cfrac{1}{a^{-n}} ~\hspace{4.5em} \cfrac{a^n}{a^m}\implies a^na^{-m}\implies a^{n-m} \\\\[-0.35em] \rule{34em}{0.25pt}\\\\ \cfrac{-27m^3 n^{-1}}{9m^2 n}\div \cfrac{(3mn)^{-2}}{(2mn)^2}\implies \cfrac{-27m^3}{9 m^2 n n^1}\div \cfrac{1}{(2mn)^2(3mn)^{2}}](/tpl/images/0548/2197/0c132.png)
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