17. Представьте натуральные числа в виде неправильных дробей: 3=\frac{\boxed{\phantom{0}}}{7} 9=\frac{\boxed{\phantom{0}}}{4} 6=\frac{\boxed{\phantom{0}}}{8} 5=\frac{\boxed{\phantom{0}}}{3} 7=\frac{\boxed{\phantom{0}}}{2} 2=\frac{\boxed{\phantom{0}}}{4} 10=\frac{\boxed{\phantom{0}}}{3} 7=\frac{\boxed{\phantom{0}}}{5} 8=\frac{\boxed{\phantom{0}}}{9} 9=\frac{\boxed{\phantom{0}}}{8} 12=\frac{\boxed{\phantom{0}}}{8} 11=\frac{\boxed{\phantom{0}}}{3} 19=\frac{\boxed{\phantom{0}}}{7} 28=\frac{\boxed{\phantom{0}}}{8} 47=\frac{\boxed{\phantom{0}}}{6} 3=\frac{\boxed{\phantom{0}}}{13} 4=\frac{\boxed{\phantom{0}}}{61} 5=\frac{\boxed{\phantom{0}}}{42} 8=\frac{\boxed{\phantom{0}}}{34} 9=\frac{\boxed{\phantom{0}}}{13} 16=\frac{\boxed{\phantom{0}}}{81} 15=\frac{\boxed{\phantom{0}}}{24} 26=\frac{\boxed{\phantom{0}}}{27} 45=\frac{\boxed{\phantom{0}}}{14} 63=\frac{\boxed{\phantom{0}}}{19} 3=\frac{\boxed{\phantom{0}}}{15} 8=\frac{\boxed{\phantom{0}}}{24} 16=\frac{\boxed{\phantom{0}}}{80} 6=\frac{\boxed{\phantom{0}}}{72} 7=\frac{\boxed{\phantom{0}}}{91} 8=\frac{\boxed{\phantom{0}}}{96} 12=\frac{\boxed{\phantom{0}}}{60} 56=\frac{\boxed{\phantom{0}}}{336} 9=\frac{\boxed{\phantom{0}}}{207} 4=\frac{\boxed{\phantom{0}}}{172} 23=\frac{\boxed{\phantom{0}}}{92} 39=\frac{\boxed{\phantom{0}}}{78} 18=\frac{\boxed{\phantom{0}}}{108} 21=\frac{\boxed{\phantom{0}}}{147} 39=\frac{\boxed{\phantom{0}}}{312} 3=\frac{\boxed{\phantom{0}}}{765} 4=\frac{\boxed{\phantom{0}}}{864} 10=\frac{\boxed{\phantom{0}}}{930} 5=\frac{\boxed{\phantom{0}}}{3345} 8=\frac{\boxed{\phantom{0}}}{4248} 25=\frac{\boxed{\phantom{0}}}{475} 27=\frac{\boxed{\phantom{0}}}{297} 84=\frac{\boxed{\phantom{0}}}{4956} 26=\frac{\boxed{\phantom{0}}}{884} 51=\frac{\boxed{\phantom{0}}}{2601}

Разберем по порядку:

1. 3 = \frac{3 \times 7}{7} = \frac{21}{7}
2. 9 = \frac{9 \times 4}{4} = \frac{36}{4}
3. 6 = \frac{6 \times 8}{8} = \frac{48}{8}
4. 5 = \frac{5 \times 3}{3} = \frac{15}{3}
5. 7 = \frac{7 \times 2}{2} = \frac{14}{2}
6. 2 = \frac{2 \times 4}{4} = \frac{8}{4}
7. 10 = \frac{10 \times 3}{3} = \frac{30}{3}
8. 7 = \frac{7 \times 5}{5} = \frac{35}{5}
9. 8 = \frac{8 \times 9}{9} = \frac{72}{9}
10. 9 = \frac{9 \times 8}{8} = \frac{72}{8}
11. 12 = \frac{12 \times 8}{8} = \frac{96}{8}
12. 11 = \frac{11 \times 3}{3} = \frac{33}{3}
13. 19 = \frac{19 \times 7}{7} = \frac{133}{7}
14. 28 = \frac{28 \times 8}{8} = \frac{224}{8}
15. 47 = \frac{47 \times 6}{6} = \frac{282}{6}
16. 3 = \frac{3 \times 13}{13} = \frac{39}{13}
17. 4 = \frac{4 \times 61}{61} = \frac{244}{61}
18. 5 = \frac{5 \times 42}{42} = \frac{210}{42}
19. 8 = \frac{8 \times 34}{34} = \frac{272}{34}
20. 9 = \frac{9 \times 13}{13} = \frac{117}{13}
21. 16 = \frac{16 \times 81}{81} = \frac{1296}{81}
22. 15 = \frac{15 \times 24}{24} = \frac{360}{24}
23. 26 = \frac{26 \times 27}{27} = \frac{702}{27}
24. 45 = \frac{45 \times 14}{14} = \frac{630}{14}
25. 63 = \frac{63 \times 19}{19} = \frac{1197}{19}
26. 3 = \frac{3 \times 15}{15} = \frac{45}{15}
27. 8 = \frac{8 \times 24}{24} = \frac{192}{24}
28. 16 = \frac{16 \times 80}{80} = \frac{1280}{80}
29. 6 = \frac{6 \times 72}{72} = \frac{432}{72}
30. 7 = \frac{7 \times 91}{91} = \frac{637}{91}
31. 8 = \frac{8 \times 96}{96} = \frac{768}{96}
32. 12 = \frac{12 \times 60}{60} = \frac{720}{60}
33. 56 = \frac{56 \times 336}{336} = \frac{18816}{336}
34. 9 = \frac{9 \times 207}{207} = \frac{1863}{207}
35. 4 = \frac{4 \times 172}{172} = \frac{688}{172}
36. 23 = \frac{23 \times 92}{92} = \frac{2116}{92}
37. 39 = \frac{39 \times 78}{78} = \frac{3042}{78}
38. 18 = \frac{18 \times 108}{108} = \frac{1944}{108}
39. 21 = \frac{21 \times 147}{147} = \frac{3087}{147}
40. 39 = \frac{39 \times 312}{312} = \frac{12168}{312}
41. 3 = \frac{3 \times 765}{765} = \frac{2295}{765}
42. 4 = \frac{4 \times 864}{864} = \frac{3456}{864}
43. 10 = \frac{10 \times 930}{930} = \frac{9300}{930}
44. 5 = \frac{5 \times 3345}{3345} = \frac{16725}{3345}
45. 8 = \frac{8 \times 4248}{4248} = \frac{33984}{4248}
46. 25 = \frac{25 \times 475}{475} = \frac{11875}{475}
47. 27 = \frac{27 \times 297}{297} = \frac{8019}{297}
48. 84 = \frac{84 \times 4956}{4956} = \frac{416304}{4956}
49. 26 = \frac{26 \times 884}{884} = \frac{22984}{884}
50. 51 = \frac{51 \times 2601}{2601} = \frac{132651}{2601}

Ответ:

3 = \frac{21}{7}; 9 = \frac{36}{4}; 6 = \frac{48}{8}; 5 = \frac{15}{3}; 7 = \frac{14}{2}; 2 = \frac{8}{4}; 10 = \frac{30}{3}; 7 = \frac{35}{5}; 8 = \frac{72}{9}; 9 = \frac{72}{8}; 12 = \frac{96}{8}; 11 = \frac{33}{3}; 19 = \frac{133}{7}; 28 = \frac{224}{8}; 47 = \frac{282}{6}; 3 = \frac{39}{13}; 4 = \frac{244}{61}; 5 = \frac{210}{42}; 8 = \frac{272}{34}; 9 = \frac{117}{13}; 16 = \frac{1296}{81}; 15 = \frac{360}{24}; 26 = \frac{702}{27}; 45 = \frac{630}{14}; 63 = \frac{1197}{19}; 3 = \frac{45}{15}; 8 = \frac{192}{24}; 16 = \frac{1280}{80}; 6 = \frac{432}{72}; 7 = \frac{637}{91}; 8 = \frac{768}{96}; 12 = \frac{720}{60}; 56 = \frac{18816}{336}; 9 = \frac{1863}{207}; 4 = \frac{688}{172}; 23 = \frac{2116}{92}; 39 = \frac{3042}{78}; 18 = \frac{1944}{108}; 21 = \frac{3087}{147}; 39 = \frac{12168}{312}; 3 = \frac{2295}{765}; 4 = \frac{3456}{864}; 10 = \frac{9300}{930}; 5 = \frac{16725}{3345}; 8 = \frac{33984}{4248}; 25 = \frac{11875}{475}; 27 = \frac{8019}{297}; 84 = \frac{416304}{4956}; 26 = \frac{22984}{884}; 51 = \frac{132651}{2601}