а) 1/8 + 3/7 = 7/56 + 24/56 = 31/56
б) 4/5 + 1/3 = 12/15 + 5/15 = 17/15
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а) 1/8 + 3/7 = 7/56 + 24/56 = 31/56
б) 4/5 + 1/3 = 12/15 + 5/15 = 17/15