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(-2) la puterea -1 + 2 la puterea -3

Răspuns :

[tex] (-2)^{-1}+ 2^{-3}=- \frac{1}{2}+ \frac{1}{2^3}=- \frac{1}{2}+ \frac{1}{8}= \frac{-3}{8} [/tex]