1. Выполните деление: a) 27 81 52 65 6) 24: 72; 7 6 B) 42:; 7' 36 г) :18;

a) \[\frac{27}{52} : \frac{81}{65} = \frac{27}{52} \cdot \frac{65}{81} = \frac{27 \cdot 65}{52 \cdot 81} = \frac{27 \cdot 5 \cdot 13}{4 \cdot 13 \cdot 27 \cdot 3} = \frac{5}{4 \cdot 3} = \frac{5}{12}\]

б) \[24 : 72 = \frac{24}{72} = \frac{1}{3}\]

в) \[42 : \frac{6}{7} = 42 \cdot \frac{7}{6} = \frac{42 \cdot 7}{6} = \frac{7 \cdot 6 \cdot 7}{6} = 7 \cdot 7 = 49\]

г) \[\frac{36}{47} : 18 = \frac{36}{47} \cdot \frac{1}{18} = \frac{36 \cdot 1}{47 \cdot 18} = \frac{2 \cdot 18 \cdot 1}{47 \cdot 18} = \frac{2}{47}\]