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¹⁵/₂ x ⅔ - ⁷/₄ x (-²⁵/₇) = 5 - (-¹⁷⁵/₂₈) = 5 + 6⁷/₂₈ = 11¼
2¼×(2½-2¼) = 2¼ x (⁵/₂ - ⁹/₄) = ⁹/₄ x (¹⁰/₄ - ⁹/₄) = ⁹/₄ x ¼ = ⁹/₁₆
Mam nadzieję, że pomogłam ;)