已知a^3+b^3=27,a^2b-ab^2=-6,求(b^3-a^3)+(a^2b-3ab^2)-2(b^3-ba^2)的值中a、b各等于多少

2025-01-04 00:19:11
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回答1:

-b^3-a^3+3a^2b-3ab^2=-(b^3+a^3)+3(a^2b-ab^2)=-27+3*(-6)=9