[tex]3 \frac{1}{6} + ( - 2 \frac{5}{9} ) - ( - 1 \frac{7}{12} ) = \\ 3 \frac{6}{36} - 2 \frac{20}{36} + 1 \frac{21}{36} = 4 \frac{27}{36} - 2 \frac{20}{36} = \\ 2 \frac{7}{36} [/tex]

Ответ:

[tex]2 \frac{7}{36} [/tex]

Пошаговое объяснение:

[tex]3 \frac{1}{6} + ( - 2 \frac{5}{9} ) - ( - 1 \frac{7}{12} ) = \frac{19}{6} - 2 \frac{5}{9} + 1 \frac{7}{12} = \frac{19}{6} - \frac{23}{9} + \frac{19}{12} = \frac{114 - 92 + 57}{36} = \frac{79}{36} = 2 \frac{7}{36} [/tex]