若x+y=-1,则x^4+5x^3y+x^2y+8x^2y^2+xy^2+5xy^3+y^4的值等于?

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若x+y=-1,则x^4+5x^3y+x^2y+8x^2y^2+xy^2+5xy^3+y^4的值等于?
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若x+y=-1,则x^4+5x^3y+x^2y+8x^2y^2+xy^2+5xy^3+y^4的值等于?
若x+y=-1,则x^4+5x^3y+x^2y+8x^2y^2+xy^2+5xy^3+y^4的值等于?

若x+y=-1,则x^4+5x^3y+x^2y+8x^2y^2+xy^2+5xy^3+y^4的值等于?
x^4+5x^3y+x^2y+8x^2y^2+xy^2+5xy^3+y^4
=x^4+5x^3y+8x^2y^2+5xy^3+y^4+x^2y+xy^2
=(x^4+2x^2y^2+y^4)+(5x^3y+5xy^3)+6x^2y^2+xy(x+y)
=(x^2+y^2)^2+5xy(x^2+y^2)+6x^2y^2-xy
=(x^2+y^2+2xy)(x^2+y^2+3xy)-xy
=(x+y)^2·[(x+y)^2+xy]-xy
=1·(1+xy)-xy
=1