Alguém pode me ajudar? É urgente!


[tex]( - \frac{5}{6} ) - ( - \frac{21}{9} ) = [/tex]





[tex]( - \frac{3}{8} ) + ( - \frac{27}{8} ) - ( - \frac{13}{8} ) = [/tex]



[tex]( - \frac{7}{12} ) - ( - \frac{1}{8} ) - ( \frac{3}{6} ) = [/tex]



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