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А = 2 7/19 b = 1 2/19 a+b = 2 7/19 + 1 2/19 = 3 9/19 a-b = 2 7/19 - 1 2/19 = 1 5/19 a = 6 7/15 b = 4 2/30 a+b = 6 7/15 + 4 2/30 = 6 7/15 + 4 1/15 = 10 8/15 a-b = 6 7/15 - 4 2/30 = 6 7/15 - 4 1/15 = 2 6/15