г) $$26\frac{2}{5} - 17\frac{3}{5} - 25\frac{5+2}{5} - 17\frac{3}{5} - (25 - 17) + (\frac{7}{5} - \frac{3}{5}) = ...$$

$$ 26\frac{2}{5} - 17\frac{3}{5} - 25\frac{5}{5} - 17\frac{3}{5} - (25 - 17) + (\frac{7}{5} - \frac{3}{5}) = 26\frac{2}{5} - 17\frac{3}{5} - 26 - 17\frac{3}{5} - 8 + \frac{4}{5} = = (26 - 26 - 17 - 8) + (\frac{2}{5} - \frac{3}{5} - \frac{3}{5} + \frac{4}{5}) = -25 - \frac{0}{5} = -25 $$