Выполните деление: 1) $$7 \frac{5}{4} : 5$$ 2) $$6 \frac{6}{35} : \frac{18}{49}$$ 3) $$\frac{27}{28} : \frac{9}{56}$$ 4) $$\frac{28}{45} : \frac{63}{40}$$ 5) $$6 : \frac{2}{7}$$

1) $$7 \frac{5}{4} : 5 = \frac{7 \cdot 4 + 5}{4} : 5 = \frac{33}{4} : 5 = \frac{33}{4} \cdot \frac{1}{5} = \frac{33}{20} = 1\frac{13}{20}$$

2) $$6 \frac{6}{35} : \frac{18}{49} = \frac{6 \cdot 35 + 6}{35} : \frac{18}{49} = \frac{216}{35} : \frac{18}{49} = \frac{216}{35} \cdot \frac{49}{18} = \frac{12}{5} \cdot \frac{7}{1} = \frac{84}{5} = 16\frac{4}{5}$$

3) $$\frac{27}{28} : \frac{9}{56} = \frac{27}{28} \cdot \frac{56}{9} = \frac{3}{1} \cdot \frac{2}{1} = 6$$

4) $$\frac{28}{45} : \frac{63}{40} = \frac{28}{45} \cdot \frac{40}{63} = \frac{4}{9} \cdot \frac{8}{9} = \frac{32}{81}$$

5) $$6 : \frac{2}{7} = \frac{6}{1} \cdot \frac{7}{2} = \frac{3}{1} \cdot \frac{7}{1} = 21$$