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這個自然數作除數. 那麼被除數兩兩相减時,餘數互相抵消,所得的差就是除數的整數倍. 59-45 = 14 = 2*7 101-59 = 42 = 2*3*7 囙此這個自然數是14、42的大於1的公因數. 這個自然數可以是2、7、14
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