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簡單點說,質數就是除了本身與1以外,不能被別的正整數整除的,如3.5.7.11.13~等等,另外2也是質數 合數,是指除了本身和1以外還能被別的數整除,如4,就能被2整除,6能被2、3整除,9能被3整除~等等,這些就是合數
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