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如果a是自然數n的約數,那麼na也是n的約數,所以,n的約數a與可以配成一對,只有在n=a2時,a與na才會相等,所以在n不是平方數時,它的約數兩兩配成,從而約數的個數是偶數;在n是平方數a2時,它的約數a只能與自己配…
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