一道数学题:1abcd-1是a*b*c*d-1,题目上abcd上没有一道线不过也有可能是:(a-1)(b-1)(c-1)(d-1)可以被a*b*c*d-1整除
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![一道数学题:1abcd-1是a*b*c*d-1,题目上abcd上没有一道线不过也有可能是:(a-1)(b-1)(c-1)(d-1)可以被a*b*c*d-1整除](/uploads/image/z/969758-62-8.jpg?t=%E4%B8%80%E9%81%93%E6%95%B0%E5%AD%A6%E9%A2%98%EF%BC%9A1abcd-1%E6%98%AFa%2Ab%2Ac%2Ad-1%EF%BC%8C%E9%A2%98%E7%9B%AE%E4%B8%8Aabcd%E4%B8%8A%E6%B2%A1%E6%9C%89%E4%B8%80%E9%81%93%E7%BA%BF%E4%B8%8D%E8%BF%87%E4%B9%9F%E6%9C%89%E5%8F%AF%E8%83%BD%E6%98%AF%3A%28a-1%29%28b-1%29%28c-1%29%28d-1%29%E5%8F%AF%E4%BB%A5%E8%A2%ABa%2Ab%2Ac%2Ad-1%E6%95%B4%E9%99%A4)
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