若x²-4x+y²+2y+5=0,求x和y的值.
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若x²-4x+y²+2y+5=0,求x和y的值.
若x²-4x+y²+2y+5=0,求x和y的值.
若x²-4x+y²+2y+5=0,求x和y的值.
x²-4x+y²+2y+5=0
x²-4x+4+y²+2y+1=0
(x²-4x+4)+(y²+2y+1)=0
(x-2)²+(y+1)²=0
(x-2)²=0 x-2=0 x=2
(y-1)²=0 y-1=0 y=1