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abcd是四個不同的整數,所以,(a-1)(b-1)(c-1)(d-1)也是四個不同的整數, 其乘積等於4,只有一種可能就是1 2 -2 -1這四個數相乘才能得到此結果 所以四個整數是-1 0 2 3 a+b+c+d=4
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