a) (⅔*7+2¼-1⅚): 3²/₉= b) 2⅜+1,75-(¹⁵/₂₅*7,5)=

a) (⅔*7+2¼-1⅚): 3²/₉=2/3 *7/1 + 9/4-11/6=14/3 +54/24 - 44/24=14/3+10/24 b) 2⅜+1,75-(¹⁵/₂₅*7,5)=

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a) (⅔*7+2¼-1⅚): 3²/₉= =(4¹⁶/₂₄+2 ⁶/₂₄- 1 ²⁰/₂₄):3²/₉= =5¹/₁₂ : 3 ²/₉= =⁶¹/₁₂ : ²⁹/₉= = ⁶¹/₁₂* ⁹/₂₉= =⁵⁴⁹/₃₄₈= =1 ²⁰¹/₃₄₈ b) 2⅜+1,75-(¹⁵/₂₅*7,5)= =⁸⁵/₄₀ + ⁷⁰/₄₀-(²⁴/₄₀*³⁰⁰/₄₀)= =¹⁵⁵/₄₀-⁷²⁰⁰/₁₆₀= =¹⁵⁵/₄₀-¹⁸⁰/₄₀= = -²⁵/₄₀= = -⁵/₈