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a^4+b^4-a^3b-ab^3=a^3(a-b)-b^3(a-b)=(a^3-b^3)(a-b)=(a-b)^2(a^2+b^2+ab)大於等於0 所以a的4次方+b的4次方大於等於a的3次方b+ab的3次方.
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