12xy^2/x+y除以4xy/x^2-y^2

12xy^2/x+y除以4xy/x^2-y^2 (XY-X^2)除以X-Y/XY=? (xy-x^2)除以xy分之x-y （y/(x^2-xy)+x/(y^2-xy))除以(x-y)/(xy) 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 x-y/x^2+xy除以xy-x^2/x^2y^2-x^4*1/x-y 代数 x^-y^/ x^-(y-z)^ 除以 x^+2xy+y^/(x-y)^-z^ 乘 x^+xy-xz/x^-xy 【2x（x平方y-xy平方）+xy（xy（xy-x平方）】除以x平方y [-xy^2(2x+y)-8xy)-x^2y)]除以2xy=计算 [(xy-2)(-xy-2)-4(xy-1)^2]除以(-xy),其中x=20,y=-25分之1 x平方+y平方+2xy分之x平方-4y平方除以x平方+xy分之2y+x y²分之（x²-2xy+y²）除以xy分之（y²-xy）乘xy²,其中x=4,y=3. 因式分解:12xy^2(y-x)+xy^3(x-y)+4x^2y(x-y) 已知x+y除以xy等于4,求2x-5xy+2y除以x+2xy+y的值请写出过程 [(x+y)^2-(x-y)^2]除以2xy [(x+y)^2-(x-y)^2 ]除以2xy (x/y)^2乘以(xy)^-2除以(x^-1y)