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2.已知 a2+72=(10b+17)2,其中b為正整數。 求證 a2是20的倍數。(3分) 證明 ∵ a2+72=(10b+17)2 ∴ a2 = 故 _____ 。
問題詳情
2.已知 a2+72=(10b+17)2,其中b為正整數。 求證 a2是20的倍數。(3分) 證明 ∵ a2+72=(10b+17)2 ∴ a2 = 故 _____ 。
參考答案
答案:A
難度:非常簡單0.96519
統計:A(305),B(11),C(0),D(0),E(0)
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