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(1)因為42÷14=3,即42和14成倍數關係,所以42和14的最大公因數是14,最小公倍數是42;(2)12=2×2×3,18=2×3×3,所以12和18的最大公因數是2×3=6,最小公倍數是2×2×3×3=36.
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