64. \((3\frac{1}{2} - 2\frac{3}{4}) \cdot (1\frac{1}{6} - \frac{1}{12})\)

\((3\frac{1}{2} - 2\frac{3}{4}) \cdot (1\frac{1}{6} - \frac{1}{12}) = (\frac{7}{2} - \frac{11}{4}) \cdot (\frac{7}{6} - \frac{1}{12}) = (\frac{14}{4} - \frac{11}{4}) \cdot (\frac{14}{12} - \frac{1}{12}) = \frac{3}{4} \cdot \frac{13}{12} = \frac{3 \cdot 13}{4 \cdot 12} = \frac{1 \cdot 13}{4 \cdot 4} = \frac{13}{16}\) Ответ: \(\frac{13}{16}\)