a) 2/7 +3/14-1/21 = (12+9-2) /42 = 19/42
b) 5/6 - 19/3 + 7/18 = (15-114+7)/18 = -92/18 = -46/9
c) 7/4 + 1/16 - 9/2 = (28+1-72)/16 = -43/16
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a) 2/7 +3/14-1/21 = (12+9-2) /42 = 19/42
b) 5/6 - 19/3 + 7/18 = (15-114+7)/18 = -92/18 = -46/9
c) 7/4 + 1/16 - 9/2 = (28+1-72)/16 = -43/16