若2x2+2xy+y2-2x+1=0,则xy的值是_.
若2x2+2xy+y2-2x+1=0,则xy的值是______.
数学人气:424 ℃时间:2019-12-16 09:55:01
优质解答
∵2x
2+2xy+y
2-2x+1=0,即(x+y)
2+(x-1)
2=0,
∴
,解得
.
∴xy=1×(-1)=-1.
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