Ответ:

[tex]12 - (5 \frac{3}{9} - 2 \frac{5}{9} ) = 12 - ( \frac{48}{9} - \frac{23}{9} ) = 12 - ( \frac{48 - 23}{9} ) = 12 - \frac{25}{9} = \frac{12}{1} - \frac{25}{9} = \frac{108}{9} - \frac{25}{9} = \frac{108 - 25}{9} = \frac{83}{9} = 9 \frac{2}{9} [/tex]