已知|x+y|+(x-y+3)^2=0,求x,y的值

已知|3x-y|+|x+y|=0,求x-y除以x*y的值. 已知x*x-4xy+4y*y=0 求[2x(x+y)-y(x+y)]/(4x*x-4xy+y*y)的值? 已知|2x-3y|+|3x-y-1|=0,求x,y的值. 已知4x-2y=0,求x-y/3x+2y的值 已知x-3y=0,求（2x+y)/(x^2-2xy+y^2)*(x-y)的值 已知x-3y=0,求(2x+y)/(x^2-2xy+y^2)*(x-y)的值. 已知x-3y=0,求(2x+y)(x-y)/x^2-2xy+y^2的值 已知x-3y=0,求2x+y/x-2xy+y乘(x-y)的值 已知y-2x=0,求3x²-2y²/(x+y)(x-y)的值 已知3x*+xy-2y*=0,求(x/y)-(y/x)-(x*+y*)/(xy)的值.*是平方 已知x.x+y.y-6x-8y+25=0,求3x.x+5y的值 已知x-y/x=x/x-2y(y不等于0),求x：y的值