42. Сравните дроби: 1) $$rac{8}{9}$$ и $$rac{17}{18}$$; 2) $$rac{6}{7}$$ и $$rac{17}{21}$$; 3) $$rac{7}{12}$$ и $$rac{11}{15}$$; 4) $$rac{5}{9}$$ и $$rac{4}{7}$$; 5) $$rac{7}{15}$$ и $$rac{13}{18}$$; 6) $$rac{7}{36}$$ и $$rac{11}{42}$$

1) $$rac{8}{9} = \frac{16}{18}$$ < $$rac{17}{18}$$ 2) $$rac{6}{7} = \frac{18}{21}$$ > $$rac{17}{21}$$ 3) $$rac{7}{12} = \frac{35}{60}$$ $$\frac{11}{15} = \frac{44}{60}$$ $$\frac{35}{60} < \frac{44}{60}$$ $$\frac{7}{12} < \frac{11}{15}$$ 4) $$\frac{5}{9} = \frac{35}{63}$$ $$\frac{4}{7} = \frac{36}{63}$$ $$\frac{35}{63} < \frac{36}{63}$$ $$\frac{5}{9} < \frac{4}{7}$$ 5) $$\frac{7}{15} = \frac{42}{90}$$ $$\frac{13}{18} = \frac{65}{90}$$ $$\frac{42}{90} < \frac{65}{90}$$ $$\frac{7}{15} < \frac{13}{18}$$ 6) $$\frac{7}{36} = \frac{49}{252}$$ $$\frac{11}{42} = \frac{66}{252}$$ $$\frac{49}{252} < \frac{66}{252}$$ $$\frac{7}{36} < \frac{11}{42}$$