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4,20,12 least common multiple X - (1 / 3-1 / 4) = 5 / 8,1 / 4 + 2x = 17 / 4
(1) The least common multiple of 4,20,12 is 60; (2) x - (1 / 3-1 / 4) = 5 / 8 x - (4 / 12-3 / 12) = 5 / 8 x - (1 / 12) = 5 / 8 x = 5 / 8 + 1 / 12 x = 15 / 24 + 2 / 24 x = 17 / 24 (3) 1 / 2 x = 17 / 2 x = 17 / 4-1 / 4 2x = 16 / 4 2x = 4 x = 4 △ 2
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