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

Решение:

\((3\frac{1}{2} - 2\frac{3}{4}) \times (1\frac{1}{6} - 1\frac{1}{12}) = (\frac{7}{2} - \frac{11}{4}) \times (\frac{7}{6} - \frac{13}{12}) = (\frac{14}{4} - \frac{11}{4}) \times (\frac{14}{12} - \frac{13}{12}) = \frac{3}{4} \times \frac{1}{12} = \frac{3}{48} = \frac{1}{16}\)

Ответ: \(\frac{1}{16}\)