若2X-3Y=0,(1/2XY)/(X^2+Y^2)-(Y^2)/(2X^2-Y^2)的值

若1/x-1/y=2,求3x-2xy-3y/x-xy-y的值3x-2xy-3y/x-xy-y 不好意思，是3x-2xy-3y/x-2xy-y 若x+y-5xy=0,求(2x-3xy+2y)/(x+2xy+y)的值 若（x+1)^2+|y-2|=0,求3x^2-[5xy-(x^2y-3xy)+4x^2y-8xy]的值 若x-y=4,xy=1,求(-2xy+2x+3y)-(3xy+2y-2x)-(x+4y+xy)的值 若x-y=4,xy=1,则(2x+y-2xy)-(3x+2y+xy)-(4xy+3y-5x)= 若x,y满足x^+2y^-2xy+1=0,求xy的值 已知/X-Y-1/+(XY+3)的平方=0,求(-2XY+2X+3Y)-(3XY+2Y-2X)-(X+4Y+XY)的值!已知/X-Y-1/+(XY+3)的平方=0,求(-2XY+2X+3Y)-(3XY+2Y-2X)-(X+4Y+XY)的值急! 若x+y=1,x不等于0则x+(2xy+y^2)/x/(x+y)/x= 若两个正实数x,y满足x^2+2xy-3y^2=0,求x^2+xy+y^2/x^2-xy+y^2 若1/x+1/y=3,4y-2xy-4x/3x+xy-3x等于多少 若1/x-1/y=1/3,求(2x+3xy-2y)/(x-3xy-y) 若1/x+1/y=2,则(2x-xy+2y)÷(3x+5xy+3y) 若1/x-1/y=3,求(2x+3xy-2y)/(x-2xy-y)的值 若1/x -1/y =3,求(2x+3xy-2y)/(x-y-2xy) 若1/X—1/Y=2,求3X-2XY-3Y/X-2XY-Y 若1/x-1/y=3,求（2x-3xy-2y)/(x-2xy-y)的值 若1/X-1/Y=3,则2X+XY-2Y/X-2XY-Y=? 若|x-3|+（y+2）=0,则（x-y+4xy/x-y）（x+y-4xy/x+y）的值是