Ответ:

[tex]\frac{1}{8} -\frac{5}{12} -(-\frac{1}{4} )=\frac{6-20}{48}+\frac{1}{4} =\frac{-14}{48}+\frac{1}{4}=\frac{-14+12}{48} =\frac{-2}{48}=-\frac{1}{24}[/tex]