Ответы на вопрос:
1) 3/11 + 5/22 = 6/22 + 5/22 = 11/22 = 1/2
2) 11/12 - 7/15 = 55/60 - 28/60 = 27/60 = 9/20
3) 11/15 - 3/20 + 1/30 = 44/60 - 9/60 + 2/60 = 37/60
а)3/11 + 5/22 = 6/22 + 5/22 = 11/22 = 1/2
б)11/12 - 7/15 = 55/60 - 28/60 =27/60=9/20
в) 11/15 - 3/20 + 1/30 = 44/60 - 9/60 + 2/60 = 37/60
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