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原式=n^4+20n²;+100-36n²; =(n²;+10+6n)(n²;+10-6n) 質數則有一個是1,另一個是質數 n²;+10+6n=1 n=-3,則n²;+10+6n=1 不是質數 n²;+10-6n=1 則n=3,n²;+10+6n=37 成立 所以n=3
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