2/5 + 2/5 = , , 1/4 + 2/4 =, , 3/7 + 3/7 =, , 4/6 - 2/6 =, , 8/4 - 4/4 =, , 4/3 - 2/3 =, , 3/9 + 5/9 =, , 2/8 + 5/8 =, , 9/5 - 1 =, , 6/10 + 2/10 =, , 1 - 7/8 =, , 1/7 + 4/7 =, .

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