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由(1)得 a²;+b²;+2ab=17(3) 由(2)得 a²;+b²;-2ab=8(4) (3)+(4)得 2a²;+2b²;=25 ∴a²;+b²;=25/2 (3)-(4)得 4ab=9 ∴ab=9/4
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