1.已知x/y=1/2,则x^2-3xy+2y^2的值为?2.m^3-m-2=0,则(m^3/m+2)-[(m^3-m)/2]=?

已知xy/x+y=1/2,则代数式3x-5xy+3y/-x+3xy-y= 已知x+y=1,xy=-2,则x²y+xy²-2xy 已知1/x=1/y=6,则3x-2xy+3y/3xy+x+y=?已知1/x+1/y=6,则3x-2xy+3y/3xy+x+y=? 已知1/x=3+1/y,则(2x-5xy-2y)/(y+3xy-x)=_______. 已知1/x+1/y=3,则2x-3xy+2y/x+xy+y=谢谢了, 已知1/x-1/y=-3,则x+3xy-y/3x-2xy-3y= 已知1/x-1/y=5,则2x+3xy-2y/y+2xy-x 已知2/X-1/Y=3,则(X-2Y-XY)/(5XY+6Y-3X)=? 已知2/x-1/y=3,则(2y-x+4xy)/(3x-6y-5xy)=? 已知1/x-1/y=-3,则x+5xy-y/3x-2xy-3y= 已知1/X+1/Y=6,则3X-2XY+3y/3XY+X+Y=多少 已知1/x减1/y=-3,则(2x+xy-2y)/x-xy-y的值为 已知1/X-1/Y=5 ,则x-2xy-y/4x+3xy-4y 已知x+xy+y=3,则(3x+2xy+3y)/(2x+xy+2y)= 已知x-y=3xy,则2x+3xy-2y除以x-2xy-y=? 已知x-y=3xy,则2x+3xy-2y/x-2xy-y= 已知3/(x-y)=1/xy 求(-x-2xy+y)/ (2x+3xy-2y) 已知xy/x+y=3,则代数式2x-7xy+2y/-x+xy-y的值是多少?