x+y=5,xy=-3,则x^2y+xy^2=x^2+y^2=____

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x+y=5,xy=-3,则x^2y+xy^2=____x^2+y^2=________

x^2y+xy^2
=xy(x+y)
=-3*5
=-15
x^2+y^2
=(x+y)^2-2xy
=5^2-2*(-3)
=25+6
=31

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