№2. Выполни умножение смешанных чисел: 1) $$3\frac{1}{4} \cdot 8$$ 2) $$4 \cdot 1\frac{1}{2}$$ 3) $$2\frac{3}{8} \cdot 6$$ 4) $$3 \cdot 2\frac{1}{9}$$ 5) $$2\frac{1}{3} \cdot 1\frac{1}{5}$$ 6) $$2\frac{1}{2} \cdot 1\frac{3}{5}$$ 7) $$7\frac{1}{2} \cdot 2\frac{4}{15}$$ 8) $$3\frac{3}{7} \cdot 2\frac{1}{3}$$

Решение:

1. $$3\frac{1}{4} \cdot 8 = \frac{13}{4} \cdot 8 = \frac{13 \cdot 8}{4} = 13 \cdot 2 = 26$$
2. $$4 \cdot 1\frac{1}{2} = 4 \cdot \frac{3}{2} = \frac{4 \cdot 3}{2} = 2 \cdot 3 = 6$$
3. $$2\frac{3}{8} \cdot 6 = \frac{19}{8} \cdot 6 = \frac{19 \cdot 6}{8} = \frac{19 \cdot 3}{4} = \frac{57}{4} = 14\frac{1}{4}$$
4. $$3 \cdot 2\frac{1}{9} = 3 \cdot \frac{19}{9} = \frac{3 \cdot 19}{9} = \frac{19}{3} = 6\frac{1}{3}$$
5. $$2\frac{1}{3} \cdot 1\frac{1}{5} = \frac{7}{3} \cdot \frac{6}{5} = \frac{7 \cdot 6}{3 \cdot 5} = \frac{7 \cdot 2}{5} = \frac{14}{5} = 2\frac{4}{5}$$
6. $$2\frac{1}{2} \cdot 1\frac{3}{5} = \frac{5}{2} \cdot \frac{8}{5} = \frac{5 \cdot 8}{2 \cdot 5} = \frac{8}{2} = 4$$
7. $$7\frac{1}{2} \cdot 2\frac{4}{15} = \frac{15}{2} \cdot \frac{34}{15} = \frac{15 \cdot 34}{2 \cdot 15} = \frac{34}{2} = 17$$
8. $$3\frac{3}{7} \cdot 2\frac{1}{3} = \frac{24}{7} \cdot \frac{7}{3} = \frac{24 \cdot 7}{7 \cdot 3} = \frac{24}{3} = 8$$

Ответ: 1) 26; 2) 6; 3) $$14\frac{1}{4}$$; 4) $$6\frac{1}{3}$$; 5) $$2\frac{4}{5}$$; 6) 4; 7) 17; 8) 8.