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因為25=5×5,所以不大可能a、b、c、d都是正數,因為若都是正數,則無非兩種情况:1、其中兩個數都是5,但題目要求是互不相等.2、其中一個數是25,但這樣一來其他三個數必須都是1所以要把負整數考慮進去.因為5×5=25,考…
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