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a²;+b²;=a²;b²;和a-c=c-b 這種題目完全可以把b看成a,這樣對a²;+b²;=a²;b²;來所,就有2a*2=a^4,顯然是不成立的,因為題目只給了a=b這一個條件,同理可以看出a-c=c-b也是錯的. 學會充分利用題目給出的條件,儘量使問題簡化,這是我給你的建議.
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