-4x^2×(二分之一xy-y^2)-3x×(xy^2-2x^2y)
问题描述:
-4x^2×(二分之一xy-y^2)-3x×(xy^2-2x^2y)
答
=-2x^3y+4x^2y^2-3x^2y^2+6x^3y
=4x^3y+x^2y^2