4x+3y=0,求X,Y的值

已知|3x-y|+|x+y|=0,求x-y除以x*y的值. x/3=y/4,求(x*x-xy)/(x*x+y*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4x-2y=0,求x-y/3x+2y的值 已知x*x+y*y-4x-6y+13=0,求3x+4y的值 已知3x*x-xy-4y*y=0(x#y),求x/y的值 x^2+4y^2-6x+4y+10=0,求x^4-y^4/(x+2y)(x-2y)*x+2y/xy^2+y^3除以（x^2+y^2/y)^2的值 若(x*x+y*y)(x*x+y*y)-4x*x*y*y=0,求代数式(x*x+5xy+y*y)/(x*x+2xy+y*y)的值 已知5x-4y=0,求x:y和x+y:y的值 化简求值：已知x、y满足：x^2+y^2-4x+6y+13=0 求代数式 的值.(3x+y)^2-3(3x-y)(x+y)-(x-3y)(x+3y)急用！ 化简求值:已知x、y,满足:x²+y²-4x+6y+13=0求代数式（3x+y)²-3（3x-y)(x+y)-(x-3y)(x+3y)的值 已知x-y=1,求[(x+2y)²+(2x+y)(x-4y)-3(x+y)(x-y)]÷y的值 已知x-y=1,求[(x+2y)^2+(2x+y)(x-4y)-3(x+y)(x-y)]除以y的值大神们帮帮忙 已知(x+2y)(2x-3y)=y(y-4x),试求x/y的值 (-x+6):(x-y);(4x+y)=3;14:1,求x+y的值. 已知x^2+3xy-4y^2=0(y≠0),求x-y/x+y的值.已知x^2+3xy-4y^2=0(y≠0),求x-y/x+y的值. 已知(4x-3y)(4x-3y)=(3x-2y)(3x-2y),并且xy不等于0,求x除以的y值 已知x-y=3,求[（x+y)(x-y)-(x-y)^2+2y(x-y)]除以的值