[tex] \: \: \: \: \: \: \: \: (3 \frac{1}{2} - \frac{3}{4} ) \times (2 \frac{1}{5} - \frac{1}{6} ) = \\ \\ = ( \frac{7}{2} - \frac{3}{4} ) \times (\frac{11}{5} - \frac{1}{6} ) = \\ \\ = ( \frac{14}{4} - \frac{3}{4} ) \times ( \frac{66}{30} - \frac{5}{30} ) = \\ \\ = \frac{11}{4} \times \frac{61}{30} = \\ \\ = \frac{671}{120} = 5\frac{71}{120} [/tex]
