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+(-1/2) = -1/8
49 = 7
(³/₅)²+(-½)³=⁹/₂₅+(-¹/₈)=⁹/₂₅-¹/₈=⁷²/₂₀₀-²⁵/₂₀₀=⁴⁷/₂₀₀
- pierwiastek z liczby 49
√49=7