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應該是題有誤吧:a^3b-2a^2b^2+ab^3才對吧 a^3b-2a^2b^2+ab^3 =ab(a^2-2ab+b^2) =ab(a^2+2ab+b^2-4ab) =ab((a+b)^2-4ab) =5(8^2-4*5) =220
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