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a+b+c=0 a+b=-c (a+b)^3=-c^3 a^3+b^3+3a^2b+3ab^2=-c^3 a^3+b^3+3ab(a+b)=-c^3 因為a+b=-c a^3+b^3-3abc=-c^3 a^3+b^3+c^3=3abc (2)第二問是不左邊少了b^3?否則不立了啊
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