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質數,也稱素數,即只能被1和它本身整除的正整數.如2,3,5,7等,2是唯一的偶數質數. 合數正與之相反,除1和它本身之外,至少還有1個數能够整除它.如4,9,12等. 如果一個數能整除另一個數,則這個數稱為另一個數的約數,也可以說是它的因數. 上述概念,一般是在正整數範圍內研究.
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