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

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