Răspuns:
3/4 + 5/3 = 9/12 + 20/12 = 29/12
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15/7 + 13/11 = 165/77 + 91/77 = 256/77
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3/13 + 1/11 = 33/143 + 13/143 = 46/143
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16/3 + 11/37 = 592/111 + 33/111 = 625/111
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11/5 + 3/7 = 77/35 + 15/35 = 92/35
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1/11 + 5/19 = 19/209 + 55/209 = 74/209
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3/5 + 1/23 = 69/115 + 5/115 = 74/115
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1 1/7 + 1 2/11 = (1 + 1) + (1/7 + 2/11) = 2 25/77
