г) $$3\frac{1}{2}-(\frac{3}{4}-2\frac{2}{5}) = 3\frac{1}{2} - \frac{3}{4} + 2\frac{2}{5} = 3\frac{1}{2} + 2\frac{2}{5} - \frac{3}{4} = 5\frac{1}{2} + \frac{2}{5} - \frac{3}{4} = 5\frac{5}{10} + \frac{4}{10} - \frac{3}{4} = 5\frac{9}{10} - \frac{3}{4} = 5\frac{18}{20} - \frac{15}{20} = 5\frac{3}{20}$$
Ответ: $$5\frac{3}{20}$$