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30和45最大公因數是15,最小公倍數是90 5和9最大公因數是1,最小公倍數是45 34和17最大公因數是17,最小公倍數是34 18和72最大公因數是18,最小公倍數是72 15和16最大公因數是1,最小公倍數是240
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