若(2x-14xy-2y)除以(x-2xy-y)=4,则1/x-1/y=

(XY-X^2)除以X-Y/XY=? (xy-x^2)除以xy分之x-y 代数 x^-y^/ x^-(y-z)^ 除以 x^+2xy+y^/(x-y)^-z^ 乘 x^+xy-xz/x^-xy 若(2x-14xy-2y)除以(x-2xy-y)=4,则1/x-1/y= （y/(x^2-xy)+x/(y^2-xy))除以(x-y)/(xy) [(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) xy分之x^2-y^2除以(x-y) x-y/x^2+xy除以xy-x^2/x^2y^2-x^4*1/x-y 【2x（x平方y-xy平方）+xy（xy（xy-x平方）】除以x平方y x平方-2x除以2y-xy等于多少, 【x的平方-2x】除以2y-xy [-xy^2(2x+y)-8xy)-x^2y)]除以2xy=计算 若正数x,y满足x平方-y平方=2xy,求x-y除以x+y的值 （xy-x²）除以xy分之x²-2xy+y²乘以x²分之x-y 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. 化简:(x-y)除以(根号x+根号y)-(x-2根号xy+y)除以(根号x-根号y)