Ответы на вопрос:
2/5 + 1/4 = 8/20 + 5/20
4/7 + 2/3 = 12/21 + 14/21
3/11 + 1/2 = 6/22 + 11/22
2/5 + 3/8 = 16/40+15/40
3/7 + 4/5 = 15/35+28/35
2/9 + 1/5 = 10/45 +9/45
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