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Rationell exponent

En potens med en rationell exponent är en potens på formen

a^{b / n}

, som t.ex.

8^{1 / 3}

eller

20 0^{5 / 3} .

En sådan potens kan också skrivas om som ett rotuttryck.

$a^{1 / n} = n a och a^{b / n} = n a^{b}$

Man kan motivera dessa regler genom att använda bland annat potenslagarna.

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