已知1/x-1/y=3,则5x+3y-5y/x-2xy-y的值
已知x/1-y/1=3,则5x+xy-5y/x+2y-y的值为
已知xy/x+y=2,则代数式3x-5y+8y/-x+3xy-y的值
已知1/x+1/y=5,求(2x-3y+2y)/(x+2xy+y)的值
已知1/x-1/y=3,求x-2xy-y/5x+3xy-5y的值
已知1/x-1/y=-3,则5x+xy-5y/x-xy-y的值为
已知1/x=1/y+3,则(5x+xy-5y)/(x-xy-y)的值为( )
已知1/X-1/Y=-2,求3X-5XY-3Y/-X+3XY+Y的值
已知1/x+1/y=5,求x+2xy+y/2x-3xy+2y的值
已知:1/X+1/Y=5,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
已知xy/x+y=1/2,则代数式3x-5xy+3y/-x+3xy-y=
已知x+y=-1,xy=-2,求代数式-5(x+y)+(x-y)+2(xy+y)的值