已知:3|x+1|+2(y-1)^2=0,求多项式(x^2+4xy-2y^2)-(x^2+y)-2(y^2+xy)-1/2(x-8y^2)的值

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已知:3|x+1|+2(y-1)^2=0,求多项式(x^2+4xy-2y^2)-(x^2+y)-2(y^2+xy)-1/2(x-8y^2)的值
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已知:3|x+1|+2(y-1)^2=0,求多项式(x^2+4xy-2y^2)-(x^2+y)-2(y^2+xy)-1/2(x-8y^2)的值
已知:3|x+1|+2(y-1)^2=0,求多项式(x^2+4xy-2y^2)-(x^2+y)-2(y^2+xy)-1/2(x-8y^2)的值

已知:3|x+1|+2(y-1)^2=0,求多项式(x^2+4xy-2y^2)-(x^2+y)-2(y^2+xy)-1/2(x-8y^2)的值
3|x+1|+2(y-1)^2=0
x+1=0
y-1=0
x=-1
y=1
(x^2+4xy-2y^2)-(x^2+y)-2(y^2+xy)-1/2(x-8y^2)
=x^2+4xy-2y^2-x^2-y-2y^2-2xy-1/2x+4y^2
=2xy-1/2x
=2*(-1)*1-1/2*(-1)
=-2+1/2
=-3/2

x+1=0
y-1=0
x=-1,y=1
(x²+4xy-2y²)-(x²+y)-2(y²+xy)-1/2(x-8y²)
=x²+4xy-2y²-x²-y-2y²-2xy-0.5x+4y²
=2xy-0.5x
=-3/2=-1.5

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