3 1/6+(-2 5/9) - (-1 7/12)

Ответ:

[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}{2 } = \frac{79}{36} = 2 \frac{7}{36} [/tex]