(x^3-y^3)+(4xy^2-2x^2y)-2(xy^2-y^3)
=(x^3+y^3)+4xy^2-2x^2y-2xy^2
=(x^3+y^3)+2(xy^2-x^2y)
=1000+2*496
=1992
若x^3+y^3=1000,且x^2y-xy^2=-496,求(x^3-y^3)+(4xy^2-2x^2y)-2(xy^2-y^3)的值
若x^3+y^3=1000,且x^2y-xy^2=-496,求(x^3-y^3)+(4xy^2-2x^2y)-2(xy^2-y^3)的值
数学人气:478 ℃时间:2020-04-23 08:45:49
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