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d=2kn^2 k為整數 n^2+d=n^2(2k+1)k=4 d=8n^2 n^2+d=9n^2=(3n)^2完全平方數命題問題 d=k(2n)^2 k為整數 n^2+d=n^2(4k+1) k=2 d=8n^2 n^2+d=9n^2=(3n)^2完全平方數命題問題
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