Respuesta :

WE have to use the rules for exponents, if we know them the answer are the following:

[tex]\begin{gathered} \frac{5^3}{5^6}=5^{3-6}=5^{-3} \\ \frac{16^6}{16^3}=16^3 \\ (21^3)^{-6}=21^{3\cdot(-6)}=21^{-18} \end{gathered}[/tex]

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