化简 x-y/(y-x)^3=
化简[(3x+4y)^2-(2x+y)(2x-y)+(-x+y)(5x-y)]除以-2y,其中x=-1,y=1
化简:(x-3y)(x+y)-(x-2y)(x+2y)-(x-y)平方
化简:【(x-y)的2次方+(x+y)(x-y)】除以2x,其中x=3,y=1.5
化简(2x^3y^3+x^4y^2+x^2y^4)^2-x^2y^2(x+y)^2,x=2012,y=-2011
已知X-Y/X+Y=3,求代数式2(x-y)/X+Y-3X+Y/X+Y
已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)
【2(x-y)^3-8(x-y)^2(x+y)+6y(x-y)^2】/2(x-y)^2=
先化简再求值(x-y)(x+y)-(x-2y) 的完全平方+x(3x-5y)-(x-y)(x-2y),其中x=1/2 y
化简(x-3y)(3x+y)-(2x-3y)(2x-3y)
(2x+3y)(3x-2y)-(x-2y)(x+2y)化简
化简 3(X-Y)²-4(X-Y)+7(X-Y)-6(X-Y)²
化简:[(x+2y)^2-(x+y)(3x-y)-5y^2]/2x