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(1)幾個自然數公有的倍數,叫做這幾個數的公倍數,其中最小的一個,叫做這幾個數的最小公倍數. (2)質數:除了一和他本身能整除之外,沒有別的數可以整除它 (3)合數:除了一和他本身能整除之外,還有其他的數能整除它
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