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分解質因數 2709=3*3*7*43 可以把一個因數看作1 因為ABCD表示不同的4個自然數 所以把最小的兩個因數合併 所以四個數為1.7.9.43 所以最小是60 把3和最大的因數合併 所以4個因數為1.3.7.129 最大為140
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