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自然數按(能否被2整除)分成奇數和偶數.【另外0也是偶數】 還可以按照(能否被除了1外的任何數整除)分成1、質數、合數 自然數按(是否是二的倍數)分成奇數與偶數.0也是偶數. 還可以按照(能否被除了1和他本身外的任何數整除)分成1、指質數、和數
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