а) Если $$m = \frac{1}{2}$$, то $$\frac{2}{5} m = \frac{2}{5} \cdot \frac{1}{2} = \frac{2}{10} = \frac{1}{5}$$
Если $$m = 2$$, то $$\frac{2}{5} m = \frac{2}{5} \cdot 2 = \frac{4}{5}$$
Если $$m = 2\frac{1}{2} = \frac{5}{2}$$, то $$\frac{2}{5} m = \frac{2}{5} \cdot \frac{5}{2} = 1$$
Если $$m = 1\frac{7}{8} = \frac{15}{8}$$, то $$\frac{2}{5} m = \frac{2}{5} \cdot \frac{15}{8} = \frac{3}{4}$$
Если $$m = \frac{15}{16}$$, то $$\frac{2}{5} m = \frac{2}{5} \cdot \frac{15}{16} = \frac{3}{8}$$
Ответ: $$\frac{1}{5}; \frac{4}{5}; 1; \frac{3}{4}; \frac{3}{8}$$