x^2+y^2-4x+6y+13=0,x,y的值
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x^2+y^2-4x+6y+13=0,x,y的值
x^2+y^2-4x+6y+13=0,x,y的值
x^2+y^2-4x+6y+13=0,x,y的值
x^2+y^2-4x+6y+13=0
x^2-4x+4+y^2+6y+9=0
(x-2)^2+(y+3)^2=0
非负数的性质
每一个平方都大于等于0,和要等于0,必须每一个都等于0
所以x-2=0,y+3=0
x=2,y=-3
x’2-4x+4+y’2+6y+9=0
(x-2)’2+(y+3)’2=0
x=2 y=-3
X=2, Y=-3
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