（x^4y+6x^3y^2-x^2y^2)/(3x^2y)
=x^4y/3x^2y+6x^3y^2/3x^2y-x^2y^2/3x^2y
=x^2/3+2xy-y/3
（x^4y+6x^3y^2-x^2y^2)/(3x^2y)=?
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