填空:()除以2x^2y-2xy^2+1 分解因式:x(a-b)^2n+y(b-a)^2n-1=填空:( )除以2x^2y-2xy^2+1分解因式:x(a-b)^2n+y(b-a)^2n-1=

(x/y)^2乘以(xy)^-2除以(x^-1y) (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) x-y/x^2+xy除以xy-x^2/x^2y^2-x^4*1/x-y (x平方y-2/3xy平方+xy)除以(1/3xy) 代数 x^-y^/ x^-(y-z)^ 除以 x^+2xy+y^/(x-y)^-z^ 乘 x^+xy-xz/x^-xy [(x+y)^2-(x-y)^2]除以2xy [(x+y)^2-(x-y)^2 ]除以2xy xy分之x^2-y^2除以(x-y) [-xy^2(2x+y)-8xy)-x^2y)]除以2xy=计算 【2x（x平方y-xy平方）+xy（xy（xy-x平方）】除以x平方y [(xy-2)(-xy-2)-4(xy-1)^2]除以(-xy),其中x=20,y=-25分之1 若(2x-14xy-2y)除以(x-2xy-y)=4,则1/x-1/y= 化简求值1.x^2+2xy+y^2/x^2-y^2除以x^2+xy/xy-y^2X=1Y=-2011 x平方-2x除以2y-xy等于多少, 【x的平方-2x】除以2y-xy 已知X+Y=3XY,求2X+2Y-XY除以X+Y+2XY的值,要算理.已知X+Y=3XY,求2X+2Y-XY除以X+Y+2XY的值,要算理.