Das kannst du so sagen. Ja.
a^(-n) = 1/a^n
Vgl. z.B. hier: http://www.matheretter.de/grundlagen/potenzen#potnegexp
2^(-7) * 2^7 = 2^(-7 + 7) = 2^0 = 1.
D.h. weil formal
2^(-7) * 2^7 = 1 | : 2^7
2^(-7) = 1/2^7
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