a) $$\frac{5}{9}:5 = \frac{5}{9} \cdot \frac{1}{5} = \frac{1}{9}$$;
б) $$\frac{4}{7}:4 = \frac{4}{7} \cdot \frac{1}{4} = \frac{1}{7}$$;
в) $$1:\frac{5}{13} = 1 \cdot \frac{13}{5} = \frac{13}{5} = 2\frac{3}{5}$$;
г) $$7:\frac{4}{7} = 7 \cdot \frac{7}{4} = \frac{49}{4} = 12\frac{1}{4}$$;
д) $$9:\frac{3}{7} = 9 \cdot \frac{7}{3} = \frac{63}{3} = 21$$