[tex]\large\boxed{\begin{array}{l}\underline{\rm Pot\hat encia\,de\,expoente\,negativo}\\\Huge\boxed{\boxed{\boxed{\boxed{\sf\bigg(\dfrac{b}{a}\bigg)^{-n}=\bigg(\dfrac{a}{b}\bigg)^n}}}}\end{array}}[/tex]
[tex]\large\boxed{\begin{array}{l}\sf 10^{-1}=\bigg(\dfrac{10}{1}\bigg)^{-1}=\bigg(\dfrac{1}{10}\bigg)^1=\dfrac{1}{10}\end{array}}[/tex]
