已知实数x,y满足(x2)+(y2)-xy+2x-y+1=0,求x,y的值
2个回答
x²+(2-y)x+y²-y+1=0
方程有解的条件是:
△=b²-4ac≥0
→ -3y²≥0
∴ y=0
∴ x=-1
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