1. 2/7 = (2×5)/(7×5) = 4/35
2. 3/10 = (3×3)/(10×3) = 9/30
3. 6/9 = (6×7)/(9×7) = 42/63
4. 8/18 = (8÷2)/(18÷2) = 4/9
5. 2/3 = (2×4)/(3×4) = 8/12
6. 4/9 = (4×5)/(9×5) = 20/45
7. 2/3 = (2×6)/(3×6) = 12/18
8. 4/9 = (4×7)/(9×7) = 28/63
9. 6/7 = (6×5)/(7×5) = 30/35
10. 3/7 = (3×5)/(7×5) = 15/35
11. 4/7 = (4×2)/(7×2) = 8/14
12. 5/9 = (5×4)/(9×4) = 20/36
13. 4/5 = (4×3)/(5×3) = 12/15
14. 5/7 = (5×2)/(7×2) = 10/14
15. 5/9 = (5×8)/(9×8) = 40/72
16. 5/9 = (5×3)/(9×3) = 15/27
17. 6/7 = (6×4)/(7×4) = 24/28
18. 4/9 = (4×5)/(9×5) = 20/45
19. 6/7 = (6×3)/(7×3) = 18/21
20. 5/7 = (5×2)/(7×2) = 10/14
21. 5/9 = (5×3)/(9×3) = 15/27
22. 6/7 = (6×5)/(7×5) = 30/35
23. 5/9 = (5×2)/(9×2) = 10/18
24. 5/9 = (5×4)/(9×4) = 20/36
25. 如果满足于一知半解，那就永远不能成为行手。

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