1
5xy-x^2y+xy^2
=xy(5-x+y)
-6x^3y^4-8x^2y^5+16xy^6
=-2xy^4(3x^2+2xy-8y^2)
=-2xy^2(3x-4y)(x+2y)
原式=xy(5-x+y)
原式=-6xy^4(x²+4/3xy-8/3y²)
5xy-x^2y+(xy)^2=xy(5-x+xy)
-6x^3y^4-8x^2y^5+16(xy)^6=2x^2y^4(8x^4y^2-3x-4y)