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Ответ:
1) Для a=1: 1/8 + 3/1 = 25/8. Для a=2: 2/8 + 3/2 = 1/4 + 3/2 = 7/4. Для a=3: 3/8 + 3/3 = 3/8 + 1 = 11/8. Для a=4: 4/8 + 3/4 = 1/2 + 3/4 = 5/4. Для a=5: 5/8 + 3/5 = (25+24)/40 = 49/40. Для a=6: 6/8 + 3/6 = 3/4 + 1/2 = 5/4.
2) Для b=1: 1/9 - 1/12 = (4-3)/36 = 1/36. Для b=2: 2/9 - 2/12 = 2/9 - 1/6 = (4-3)/18 = 1/18. Для b=3: 3/9 - 3/12 = 1/3 - 1/4 = (4-3)/12 = 1/12. Для b=4: 4/9 - 4/12 = 4/9 - 1/3 = (4-3)/9 = 1/9. Для b=5: 5/9 - 5/12 = 5(1/9 - 1/12) = 5(1/36) = 5/36. Для b=6: 6/9 - 6/12 = 2/3 - 1/2 = (4-3)/6 = 1/6.
2) Для b=1: 1/9 - 1/12 = (4-3)/36 = 1/36. Для b=2: 2/9 - 2/12 = 2/9 - 1/6 = (4-3)/18 = 1/18. Для b=3: 3/9 - 3/12 = 1/3 - 1/4 = (4-3)/12 = 1/12. Для b=4: 4/9 - 4/12 = 4/9 - 1/3 = (4-3)/9 = 1/9. Для b=5: 5/9 - 5/12 = 5(1/9 - 1/12) = 5(1/36) = 5/36. Для b=6: 6/9 - 6/12 = 2/3 - 1/2 = (4-3)/6 = 1/6.
