Explicație pas cu pas:
[tex]( - \frac{20}{27} ) - ( - \frac{5}{9} ) - ( + \frac{2}{3} ) - ( - 3) = \\ \\ = - \frac{20}{27} + \frac{5}{9} - \frac{2}{3} + 3 = \\ \\ = \frac{ - 20 + 15 - 18 + 81}{27} = \frac{58}{27} [/tex]
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[tex]( - \frac{1}{6} ) - ( - \frac{15}{6} ) - ( - \frac{31}{48} ) - ( - \frac{13}{12} ) = \\ \\ = - \frac{1}{6} + \frac{15}{6} + \frac{31}{48} + \frac{13}{12} = \\ \\ = \frac{14}{6} + \frac{31}{48} + \frac{13}{12} = \frac{7}{3} + \frac{31}{48} + \frac{13}{12} = \\ \\ = \frac{112 + 31 + 52}{48} = \frac{195}{48} = \frac{65}{16} [/tex]
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[tex]( - \frac{7}{9} ) - ( - \frac{2}{5} ) - ( - \frac{1}{15} ) - \frac{2}{45} = \\ \\ = - \frac{7}{9} + \frac{2}{5} + \frac{1}{15} - \frac{2}{45} = \\ \\ = \frac{ - 35 + 18 + 3 - 2}{45} = - \frac{16}{45} [/tex]
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[tex]( - \frac{3}{8} ) - \frac{1}{7} - ( - \frac{5}{14} ) - \frac{3}{2} = \\ \\ = - \frac{3}{2} - \frac{1}{7} + \frac{5}{14} - \frac{3}{2} = \\ \\ = \frac{ - 21 - 8 + 20 - 84}{56} = - \frac{93}{56} [/tex]
