31. Найдите произведение:

### 31. Найдите произведение: 1) $\frac{5}{6} \cdot \frac{12}{15} = \frac{5 \cdot 12}{6 \cdot 15} = \frac{1 \cdot 2}{1 \cdot 3} = \frac{2}{3}$ 2) $\frac{3}{8} \cdot \frac{4}{24} = \frac{3 \cdot 4}{8 \cdot 24} = \frac{1 \cdot 1}{2 \cdot 8} = \frac{1}{16}$ 3) $\frac{32}{45} \cdot \frac{15}{24} = \frac{32 \cdot 15}{45 \cdot 24} = \frac{4 \cdot 1}{3 \cdot 3} = \frac{4}{9}$ 4) $\frac{9}{11} \cdot \frac{44}{24} = \frac{9 \cdot 44}{11 \cdot 24} = \frac{3 \cdot 4}{1 \cdot 8} = \frac{3}{2} = 1\frac{1}{2}$ 5) $\frac{36}{14} \cdot \frac{21}{24} = \frac{36 \cdot 21}{14 \cdot 24} = \frac{3 \cdot 3}{2 \cdot 2} = \frac{9}{4} = 2\frac{1}{4}$ 6) $\frac{15}{16} \cdot \frac{48}{55} = \frac{15 \cdot 48}{16 \cdot 55} = \frac{3 \cdot 3}{1 \cdot 11} = \frac{9}{11}$ ### 32. Выполните умножение: 1) $\frac{11}{12} \cdot 24 = \frac{11 \cdot 24}{12} = 11 \cdot 2 = 22$ 2) $14 \cdot \frac{23}{28} = \frac{14 \cdot 23}{28} = \frac{1 \cdot 23}{2} = \frac{23}{2} = 11\frac{1}{2}$ 3) $\frac{5}{21} \cdot 12 = \frac{5 \cdot 12}{21} = \frac{5 \cdot 4}{7} = \frac{20}{7} = 2\frac{6}{7}$ 4) $\frac{11}{25} \cdot 15 = \frac{11 \cdot 15}{25} = \frac{11 \cdot 3}{5} = \frac{33}{5} = 6\frac{3}{5}$