Решение:

1)

1. $$3 \frac{1}{8} = \frac{3 \cdot 8 + 1}{8} = \frac{25}{8}$$
2. $$ \frac{1}{3} : 0,25 = \frac{1}{3} : \frac{1}{4} = \frac{1}{3} \cdot \frac{4}{1} = \frac{4}{3} $$
3. $$ 1,5 : \frac{25}{8} = \frac{3}{2} : \frac{25}{8} = \frac{3}{2} \cdot \frac{8}{25} = \frac{3 \cdot 4}{1 \cdot 25} = \frac{12}{25} $$
4. $$ \frac{12}{25} - \frac{4}{3} = \frac{12 \cdot 3 - 4 \cdot 25}{25 \cdot 3} = \frac{36 - 100}{75} = \frac{-64}{75} $$
5. $$ \frac{-64}{75} \cdot 3,2 = \frac{-64}{75} \cdot \frac{32}{10} = \frac{-64 \cdot 32}{75 \cdot 10} = \frac{-2048}{750} = \frac{-1024}{375} $$
6. $$ 3,2 \cdot \frac{5}{8} = \frac{32}{10} \cdot \frac{5}{8} = \frac{4}{2} \cdot \frac{1}{1} = 2 $$
7. $$ \frac{-1024}{375} - 2 = \frac{-1024 - 2 \cdot 375}{375} = \frac{-1024 - 750}{375} = \frac{-1774}{375} = -4 \frac{274}{375} $$

Ответ: $$ -4 \frac{274}{375} $$

2)

1. $$ 2 \frac{11}{12} = \frac{2 \cdot 12 + 11}{12} = \frac{24 + 11}{12} = \frac{35}{12} $$
2. $$ 2 \frac{1}{3} = \frac{2 \cdot 3 + 1}{3} = \frac{7}{3} $$
3. $$ 1,45 : \frac{7}{3} = \frac{145}{100} : \frac{7}{3} = \frac{29}{20} \cdot \frac{3}{7} = \frac{29 \cdot 3}{20 \cdot 7} = \frac{87}{140} $$
4. $$ \frac{1}{20} : \frac{7}{3} = \frac{1}{20} \cdot \frac{3}{7} = \frac{3}{140} $$
5. $$ \frac{87}{140} - \frac{3}{140} = \frac{87 - 3}{140} = \frac{84}{140} = \frac{21}{35} = \frac{3}{5} = 0,6 $$
6. $$ 0,1 \cdot 0,6 = 0,06 $$
7. $$ \frac{7}{40} : \frac{35}{12} = \frac{7}{40} \cdot \frac{12}{35} = \frac{1}{10} \cdot \frac{3}{5} = \frac{3}{50} = 0,06 $$
8. $$ 0,06 - 0,06 = 0 $$

Ответ: 0