2x^2+2xy+y^2-2x+1=0 则xy=( )要过程
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![2x^2+2xy+y^2-2x+1=0 则xy=( )要过程](/uploads/image/z/5181639-15-9.jpg?t=2x%5E2%2B2xy%2By%5E2-2x%2B1%3D0++%E5%88%99xy%3D%EF%BC%88++%EF%BC%89%E8%A6%81%E8%BF%87%E7%A8%8B)
2x^2+2xy+y^2-2x+1=0 则xy=( )要过程
2x^2+2xy+y^2-2x+1=0 则xy=( )
要过程
2x^2+2xy+y^2-2x+1=0 则xy=( )要过程
2x^2+2xy+y^2-2x+1
=x^2+2xy+y^2+x^2-2x+1
=(x+y)^2+(x-1)^2=0
x+y=0
x-1=0
x=1
y=-1
xy=-1