若(x^2+y^2)(x^2+y^2-1)-12=0,且xy=5/2,求x+y的值
已知x>0,y>0,且x+6y=5根号xy,求(2x+根号xy-y)分之(x+根号xy+2y)的值
已知5x-4y=0且xy不等于0,求x^2+y^2/x^2-y^2-x+y/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-5xy=0,求(2x-3xy+2y)/(x+2xy+y)的值
已知x+y=-1,xy=-2,求代数式-5(x+y)+(x-y)+x(xy+y)的值
若x>0,y>0,且√x(√x+√y)=3√y(√x+5√y),求(2x+2√xy+3y)/(x-√xy+y)的值.
已知x^2-xy+3y^2=0 且xy不等于0 求x/y+y/x 的值
已知xy≠0,且2x+3xy-2y=0,求(x+y)/(x-y)的值.
若x>0,y>0,且x-(√xy)-2y=0,求x/y的值
已知|x|=5,|y|=2,且xy>0,求|x+y|-|x-y|的值,
1.若x分之1-y分之1=2,则求x-xy-y分之3x+xy-3y=0的值.2.设x,y为实数,且x-y=3.求x乘根号
已知x+y=-1,xy=-2,求代数式-5(x+y)+(x-y)+2(xy+y)的值