a = 2 2 x 3 3 ,b = 2 3 x 3 2 x 7 ,c = 2 4 x 3 4. (a, b, c) = 2 2 x 3 2. [a, b, c] = 2 4 x 3 4 x 7. 很容易發現,(a, b, c) x [a, b, c] ≠ abc.
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