若4x^2-4x+y^2+8y+17=0,则xy=
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若4x^2-4x+y^2+8y+17=0,则xy=
4x²-4x+1+y²+8y+16=0
(2x-1)²+(y+4)²=0
2x-1=0 y+4=0
x=1/2 y=-4
xy=-2
(2x-1)²+(y+4)²=0
2x-1=0 y+4=0
x=1/2 y=-4
xy=-2
若x+y=-1,则x^4+5x^3y+x^2y+8x^2y^2+xy^2+5xy^3+y^4=( )
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