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(7¼-10½)·(2⁷/₉-3⁷/₉)
(8¹/₂-10):(12³/₄-10³⁰/₆)
(12½-17¼):(2-7½)
(7¼-10½)·(2⁷/₉-3⁷/₉)=(²⁹/₄ - ⁴²/₄)·( -1)=-¹³/₄·(-1)=3¼
(8¹/₂-10):(12³/₄-10³⁰/₆)=(-1,5):(12,75-15)=(-1,5):(-2,25)=⅔
(12½-17¼):(2-7½)=(⁵⁰/₄ - ⁶⁹/₄):(-5,5)=(-¹⁹/₄):(-5,5)=(-¹⁹/₄)·(-²/₁₁)=³⁸/₄₄=¹⁹/₂₂
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(7¼-10½)·(2⁷/₉-3⁷/₉)=(²⁹/₄ - ⁴²/₄)·( -1)=-¹³/₄·(-1)=3¼
(8¹/₂-10):(12³/₄-10³⁰/₆)=(-1,5):(12,75-15)=(-1,5):(-2,25)=⅔
(12½-17¼):(2-7½)=(⁵⁰/₄ - ⁶⁹/₄):(-5,5)=(-¹⁹/₄):(-5,5)=(-¹⁹/₄)·(-²/₁₁)=³⁸/₄₄=¹⁹/₂₂