x²+y²-4x+6y+13=0(x²-4x+4)+(y²+6y+9)=0(x-2)²+(y+3)²=0x-2=y+3=0(x,y)=(2,-3)
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x²+y²-4x+6y+13=0(x-2)²+(y+3)²=0(x-2)²=0(y+3)²=0所以:x=2y=-3
x=2 y=-3