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由題意知: AC+CB=7/2① AB-BC=1/2② AB²;=AC²;+BC²;③ 將②,③聯立化簡得: AC²;=1/4+BC④ 將①,④聯立化簡得: BC²;-8BC+12=0 得:BC=2,BC=6(舍去,不合題意) AB=1/2+2=5/2
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