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$( \frac{1}{3} - \frac{5}{16} ) : ( \frac{1}{6} - \frac{1}{8} ) = ( \frac{16-15}{48}) : ( \frac{4-3}{24}) = \frac{1}{48} :\frac{1}{24} = \frac{1}{48} * \frac{24}{1} = \frac{1}{2} = 0,5$
$(\frac{5}{7} - \frac{2}{3}) : ( \frac{4}{9} - \frac{5}{12} ) = (\frac{15-14}{21}) : (\frac{16-15}{36}) = \frac{1}{21} : \frac{1}{36} = \frac{1}{21} * \frac{36}{1} = \frac{1}{7} * \frac{12}{1} = \frac{12}{7}$