已知x^2+y^2=6,xy=5,试求x+y的值

已知:x/y=-2,求x^2-2xy-3y^2/x^-6xy 已知x^2+y^2=6,xy=5,试求x+y的值 已知X+y=6,xy=7 求x^2y+xy^2=已知X+y=6,xy=7 x^2y+xy^2 已知X-XY-2Y=0求2X+3XY-Y/X-2XY+5Y 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/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=2(x+y),求5x-xy+5y/3xy-x-y的值 已知x-y=3xy,求5x+2xy-5y/x-4xy-y的值 已知Y-x=3xy,求(5x+3xy-5y)÷(x-2xy-y) 已知xy/x+y=6,求3x-2xy+3y/-x+3xy-y的值. 已知(xy)/(x+y)=6求(3x-2xy+3y)/(-x+3xy-y)的值. 已知xy/x+y=2,求代数式8x-5xy+8y/-x+3xy-y的值 已知X+Y=2XY,求4X-5XY+4Y 除以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=2xy,求4x-5xy+4y/xy-x-y的值 已知X+Y分之XY=2,求-X+3XY-Y分之3X+5XY+3Y