Как решить примеры 27/52 : 81/65 9 5/7: 1 23/28 42 : 6/7

 \frac{27}{52} : \frac{81}{65}  = \frac{27}{52} * \frac{65}{81} = \frac{1}{52} * \frac{65}{3} = \frac{65}{156} \\ \frac{95}{7} : \frac{123}{28} = \frac{95}{7} * \frac{28}{123} =95* \frac{4}{129} = \frac{380}{129} \\ 42: \frac{6}{7}=42* \frac{7}{6} =7*7=49