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a) (2/3) la puterea 0 x (2/3) la puterea 1 x (2/3) la puterea 2
b) (1 cu 3/4) la puterea 0 x (1 cu 3/4) la puterea 1 x (1 cu 3/4) la puterea 2
c) [(2/3) la puterea 2] la puterea 5 : (2/3) la puterea 7