若3x-4y=0 求x+y/x 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 若2/x-1/y=3,求[y/x-y/x-y(x-y/x-x+y)]/x-2y/x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 若x^2-4x+y^2-10y+29=0,求x^2y^2+2x^3y^2+x^4y^2的值 若x^5+x^4y+x^4+x+y+1=0,且3x+2y=1,求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? 若／X+Y-9／+（2X-Y+3)=0求X与Y的值 若x+y=4,xy=3,求y/x + x/y的值. 已知4x-2y=0,求x-y/3x+2y的值 若3x-4y=0 求x+y/x 的值 若X,Y互为相反数,且(X+Y+3)(X-Y-2)=0,求X,Y的值? 若x*x-4y*y=-15,x+2y=3,求x和y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 若4x-3y=0,则求(x+y):y的值 RT,若（√2x-y）+y^2+4y+4=0,求[(x-y)^2+(x+y)(x-y)]÷2x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！