[-xy^2(2x+y)-8xy)-x^2y)]除以2xy=
(xy-x^2)乘以(xy)/(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=2XY,求4X-5XY+4Y 除以X+XY+Y 的值
已知x-xy=8,xy-y=-9,求x+y-2xy的值
已知xy除以x+y=2,求代数式8x-5xy+8y除以-x+3xy-y的值
[(xy-2)(-xy-2)-4(xy-1)^2]除以(-xy),其中x=20,y=-25分之1
(x^2+xy/x-y)/(xy/x-y)计算
(-3x^y+2xy)-( )=4x^+xy
(xy-x²)除以xy分之x²-2xy+y²乘以x²分之x-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
若(2x-14xy-2y)除以(x-2xy-y)=4,则1/x-1/y=
X²+2xy+y²/xy乘x²-2xy+y²/xy+y²=