1、若x+y=6,xy=3,则xy^2+x^2y的值为________.2、若x^2+y=3,x^4+x^2y=27,则x=________.

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1、若x+y=6,xy=3,则xy^2+x^2y的值为________.2、若x^2+y=3,x^4+x^2y=27,则x=________.

1、若x+y=6,xy=3,则xy^2+x^2y的值为________.2、若x^2+y=3,x^4+x^2y=27,则x=________.
1、若x+y=6,xy=3,则xy^2+x^2y的值为________.2、若x^2+y=3,x^4+x^2y=27,则x=________.

1、若x+y=6,xy=3,则xy^2+x^2y的值为________.2、若x^2+y=3,x^4+x^2y=27,则x=________.
xy^2+x^2y
=xy(x+y)
=3×6
=18
x^4+x^2y=27
x²(x²+y)=27
3x²=27
x²=9
∴x=3或-3

1、x+y=6,xy=3
(x+y)^2=x^2+y^2+2xy
36=x^2+y^2+6
x^2+y^2=30
2、x^2+y=3，x^4+x^2y=27，
x^2(x^2+y)=27,3x^=27,x^2=9
x=3,x=-3

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