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[(2 ⅕)⁻³]³ * (2⅕)⁷=[(11/5)⁻³]³ * (11/5)⁷=
=(5³/11³)³ * 11⁷/5⁷= 5⁹/11⁹ *11⁷/5⁵
te dwa ułamki po wymnożeniu i skróceniu:
5²/11²=25/121