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+
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