Ответ:

[tex]1 - ( 1 \frac{2}{9} - \frac{5}{9} ) = 1 - ( \frac{9 + 2}{9} - \frac{5}{9} ) = 1 - ( \frac{11}{9} - \frac{5}{9} ) = 1 - \frac{11 - 5}{9} = 1 - \frac{6}{9} = 1 - \frac{2}{3} = \frac{3}{3} - \frac{2}{3} = \frac{3 - 2}{3} = \frac{1}{3} [/tex]