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四個連續正整數的積與1的和一定是一個完全平方數.證:設4個連續正整數分別為n,n+1,n+2,n+3(其中n為正整數)n(n+1)(n+2)(n+3)+1=[n(n+3)][(n+1)(n+2)]+1=(n²;+3n)(n²;+3n+2)+ 1=(n²;+3n)²;+2(n²;+…
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