已知x^2+y^2-4x+2y+5=0,求4x^2-12xy+9y^2的值
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已知x^2+y^2-4x+2y+5=0,求4x^2-12xy+9y^2的值已知x^2+y^2-4x+2y+5=0,求4x^2-12xy+9y^2的值已知x^2+y^2-4x+2y+5=0,求4x^2-
已知x^2+y^2-4x+2y+5=0,求4x^2-12xy+9y^2的值
已知x^2+y^2-4x+2y+5=0,求4x^2-12xy+9y^2的值
已知x^2+y^2-4x+2y+5=0,求4x^2-12xy+9y^2的值
(x-2)^2+(y+1)^2=0
x=2 y=-1
4x^2-12xy+9y^2=(2x-3y)^2=49
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