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你可以設這四個數為n,(n+1),(n+2),(n+3)n(n+1)(n+2)(n+3)+1 =(n^2+3n)(n^2+3n+2)+1 =(n^2+3n)^2+2(n^2+3n)+1 =(n^2+3n+1)^2∴這個數為完全平方數
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