https://pt.khanacademy.org/math/3-serie-em-mat-sp/x08986e37a150210b:1-bimestre/x08986e37a150210b:aula-6-potenciacao-e-radiciacao/e/exponents?classCode=XCEFVHAB&assignment=ag5zfmtoYW4tYWNhZGVteXITCxIKQXNzaWdubWVudBiogIwEDA #22

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