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質數=素數也就是只能够被1和自身整除的數,比如:2,3,5,7,之類的,有很多合數就是除了1和自身以外還可以被其他數整除的數,這就更多了,比如4,6,8,10,之類的,偶數除了2之外都是合數,奇數當然也可以是合數偶數就是能够被2…
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