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a) 13 1/7 + 2 2/3 = 13 3/21 + 2 14/21 = 15 17/21
b) 3 3/4 : 5/6 - 1/4 * 1 2/3 = 15/4 : 5/6 - 1/4 * 5/3 = 15/4 * 6/5 - 5/12 = 9/2 - 5/12 = 54/12 - 5/12 = 49/12
c) 1 2/5 * 3 4/7 - 2 1/8 * 2 6/17 = 7/5 * 25/7 - 17/8 * 40/17 = 5 - 5 = 0