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108
54=2X3X3X3 72=2X2X2X3X3 最小公倍數=2X2X2X3X3X3=216
48=2×2×2×2×3,72=2×2×2×3×3,所以48和72的最小公倍數是2×2×2×3×2×3=144.故答案為:144.
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