x²-4x+y²+6y+13=0.x=?y=?
1个回答
x²-4x+y²+6y+13=0
x²-4x+4+y²+6y+9=0
(x-2)²+(y+3)²=0
平方非负
所以 x-2=0,y+3=0
x=2,y=-3
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