已知x-y=-5,xy=3,则x^2+y^2=?

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已知x-y=-5,xy=3,则x^2+y^2=?已知x-y=-5,xy=3,则x^2+y^2=?已知x-y=-5,xy=3,则x^2+y^2=?x^2+y^2=（x-y）^2+2xy=(-5)^2+2

已知x-y=-5,xy=3,则x^2+y^2=?
已知x-y=-5,xy=3,则x^2+y^2=?

已知x-y=-5,xy=3,则x^2+y^2=?
x^2+y^2
=（x-y）^2+2xy
=(-5)^2+2*3
=25+6
=31

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