已知:x+y=-5,xy=6,求x^2+y^2
已知x+y=-1,xy=-2,求代数式-5(x+y)+(x-y)+x(xy+y)的值
已知:x/y=-2,求x^2-2xy-3y^2/x^-6xy
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xy=-2,x-y=3,求(x+y)(x-y)-y^2+(x-y)^2-(6x^2y-2xy^2)÷2y
已知xy/x+y=3,求代数式2x-5xy+2y/x-3xy+y
已知xy/x+y=2,求代数式3x-5xy+3y/-x+2xy-y的值
已知xy=2(x+y),求(5x-xy+5y)/(3xy-x-y)的值
已知xy/x+y=6,求3x-2xy+3y/-x+3xy-y的值.
已知x-y=2xy,求代数式3x-5xy-3y/x+xy-y的值
已知X+Y=2XY,求4X-5XY+4Y 除以X+XY+Y 的值
已知X+Y分之XY=2,求-X+3XY-Y分之3X+5XY+3Y
已知x+y=-1,xy=-2,求代数式-5(x+y)+(x-y)+2(xy+y)的值