=-2x^3y+4x^2y^2-3x^2y^2+6x^3y
=4x^3y+x^2y^2
-4x^2×(二分之一xy-y^2)-3x×(xy^2-2x^2y)
-4x^2×(二分之一xy-y^2)-3x×(xy^2-2x^2y)
数学人气:595 ℃时间:2019-11-18 08:05:59
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