作业帮2x^2+6xy+9y^2-6x+9=0,求x,y的值.
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2x^2+6xy+9y^2-6x+9=0,求x,y的值.
2x^2+6xy+9y^2-6x+9=0,求x,y的值.
2x^2+6xy+9y^2-6x+9=0,求x,y的值.
即(x²+6xy+9y²)+(x²-6x+9)=0
(x+3y)²+(x-3)²=0
所以x+3y=x-3=0
所以x=3
y=-x/3=-1
x=3，y=-1
2x^2+6xy+9y^2-6x+9=0,x^2+6xy+9y^2+x^2-6x+9=0,
(x+3y)^2+(x-3)^2=0,x+3y=0,x-3=0,x=3,y=-1
（x+3y）^+(x-3)^=0则分别等于零
x=-3y，x=3，y=-9
(x-2xy)*(-xy+2y*y)-(3x*x-2xy)(x-9xy+6y*y)答案应为-2x-x*x-3x，
已知x^2-6xy+9y^2=0,求(x-y)/(x+y)
化简：x-y/x+3y÷x^-y^2/x^2+6xy+9y^2-(xy/x+y)
2x方-6xy+9y方-4x+4=0 xy=多少
3x的平方-xy/9x的平方-6xy+y的平方,其中2x-y=0
已知x^2+9y^2-2x-6y+2=0,求{-（xy/（x-y）^2}^4*(y^2-xy/x)^3*x^4/y^10/(x/xy-y^2)^5的值
-3x^2y+6xy^2-9xy=( )(x-2y+3)
若2x^2-6xy+9y^2-4x+4=0,则y/x-x/y=若2x^2-6xy+9y^2-4x+4=0,则y/x-x/y=?
求x^3 - 6x^2y + 11xy^2 - 6y^3 思路x^3 - 6x^2y + 11xy^2 - 6y^3= x^3 - 3x^2y + 2xy^2 - 3x^2y + 9xy^2 - 6y^3= (x^2 - 3xy + 2y^2)(x - 3y)= (x^2 - 2xy - xy + 2y^2)(x - 3y)(x - y)(x - 2y)(x - 3y)求思路
x^2-4xy+5y^2+6y+9=0,x+y=
3x^2-xy /9x^2-6xy+y^2=x/( )=( )/9x^2-y^2
3/x —2/y=3 (2x-3y-xy) / (7xy+9y-6x)=
-9y^2+6xy-x^2
(9x^2y-6xy^2)/3xy
[ 2x-6y][8-9xy]÷xy等于?
已知x+y=2xy,且xy不等于0,则求-2x+6xy-2y/(7x+5y)-9xy-(3x+y)=___
化简求值,若X方-2XY+Y方+1XY-11=0,求X方+6XY+9Y方分之X方-25Y方*5X-25Y分之X+3Y的值
解方程组：{x²+xy-2y²=0,x²+6xy-9y²=1