已知x+y=3,x^2+y^2-3xy=4,则x^3y+xy^3=___________

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已知x+y=3,x^2+y^2-3xy=4,则x^3y+xy^3=___________已知x+y=3,x^2+y^2-3xy=4,则x^3y+xy^3=___________已知x+y=3,x^2+

已知x+y=3,x^2+y^2-3xy=4,则x^3y+xy^3=___________
已知x+y=3,x^2+y^2-3xy=4,则x^3y+xy^3=___________

已知x+y=3,x^2+y^2-3xy=4,则x^3y+xy^3=___________
x+y=3
(x+y)^2=9
x^2+y^2+2xy=9
x^2+y^2-3xy=4
xy=1
x^2+y^2=7
x^3y+xy^3
=xy(x^2+y^2)
=7

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