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cu se face 3la puterea -2

Răspuns :

[tex]3^{-2}= \frac{1}{3^2}= \frac{1}{9} \\ Obs. In \ general \ a^{-n}= \frac{1}{a^n} \ si\\ ( \frac{a}{b} )^{-n}=( \frac{b}{a} )^n.[/tex]