化简:12(y-x)^2/27(x-y)
化简:(x-3y)(x+y)-(x-2y)(x+2y)-(x-y)平方
化简:(2x-y)²-4(x-y)(x+y)
化简(x+y)-(2x+y/2)-(3x+y/6)-(4x+y/12)-(5x+y/20)-……-(10x+y/90)
(x-y)^2+12(x-y)+36
化简(y-x)(z-x)/(x-2y+z)(x+y-2z)+(z-y)(x-y)/(x-2z+y)(y+z-2x)+(x
1、x(x-y)(x+y)-x(x+y)^2
(2x+3y)(3x-2y)-(x-2y)(x+2y)化简
化简:[(x+2y)^2-(x+y)(3x-y)-5y^2]/2x
化简:{(x+2y)(2y-x)-4y(-x+y) } / (-2x)
化简:【(2x-y)(2x+y)+y(y+6x)】÷2x
化简(x-3y)(3x+y)-(2x-3y)(2x-3y)
化简(x平方-y平方)/(x+y)+(x平方-2xy+y平方)/(x-y)