Aplicamos a regra: $\frac{a^m}{a^n}$$=a^{\left(m-n\right)}$, onde $a^n=x^5$, $a^m=x^{12}$, $a=x$, $a^m/a^n=\frac{x^{12}}{x^5}$, $m=12$ e $n=5$
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