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=(2 ⁹/₁₅ - 1⁵/₁₅) * (-0,9)=
= 1 ⁴/₁₅ * (-⁹/₁₀)=
= ¹⁹/₁₅ * (-⁹/₁₀)= - ⁵⁷/₅₀ = -1 ⁷/₅₀
b) ( 3 ⁵/₇ - 4 ½) * (1,99 - 2,06) =
= (3 ¹⁰/₁₄ - 4 ⁷/₁₄) * (-0,07) =
= - ¹¹/₁₄ * (-⁷/₁₀₀) = ⁷⁷/₁₄₀₀ = ¹¹/₂₀₀
c) ( 2: 0,3 - 5⅓) : (0,25 - ⅔) =
= (2 : ³/₁₀ - 5⅓) : (¼- ⅔) =
= (2 * ¹⁰/₃ - 5⅓) : (³/₁₂- ⁸/₁₂) =
= (²⁰/₃ - 5⅓) : (- ⁵/₁₂) =
= (6 ⅔ - 5⅓) : (- ⁵/₁₂) =
= 1 ⅓ : (- ⁵/₁₂) =
= ⁴/₃ * (-¹²/₅)=
= - ¹⁶/₅ = - 3 ⅕
d) 2,6 : 1,2 - 4½ ) : ( 0,75 - ⅓) =
= (2⁶/₁₀ : 1 ²/₁₀ - 4½ ) : (¾- ⅓) =
= (²⁶/₁₀ : ¹²/₁₀ - 4½ ) : (⁹/₁₂ - ⁴/₁₂) =
= (²⁶/₁₀ * ¹⁰/₁₂ - 4½ ) : ( ⁵/₁₂) =
= ( ¹³/₆ - 4½ ) : ( ⁵/₁₂) =
= (2⅙ - 4 ³/₆ ) : ( ⁵/₁₂) =
= -2 ²/₆ : ( ⁵/₁₂) =
= - 2 ⅓ : ( ⁵/₁₂) =
= - ⁷/₃ * ¹²/₅ =
= - ²⁸/₅ = -5 ⅗