469. a) 2 5/9 - 1; б) 2 5/9 - 1 2/9; в) 2 5/9 - 1 7/9; г) 2 5/9 - 1 8/9

Решение:

1. 469. а)

   $$2 \frac{5}{9} - 1 = 2 - 1 + \frac{5}{9} = 1 \frac{5}{9}$$

2. 469. б)

   $$2 \frac{5}{9} - 1 \frac{2}{9} = 2 - 1 + \frac{5}{9} - \frac{2}{9} = 1 + \frac{3}{9} = 1 \frac{3}{9} = 1 \frac{1}{3}$$

3. 469. в)

   $$2 \frac{5}{9} - 1 \frac{7}{9} = \frac{23}{9} - \frac{16}{9} = \frac{7}{9}$$

4. 469. г)

   $$2 \frac{5}{9} - 1 \frac{8}{9} = \frac{23}{9} - \frac{17}{9} = \frac{6}{9} = \frac{2}{3}$$

Ответ: a) $$1 \frac{5}{9}$$, б) $$1 \frac{1}{3}$$, в) $$\frac{7}{9}$$, г) $$\frac{2}{3}$$